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Iron ore is, usually, found in the form of A. oxides B. carbonates C. sulphides D. all of these The hardness of steel increases if it contains A. pearlite B. ferrite C. cementit e D. martensite In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled A. in still air B. slowly in the furnace C. suddenly in a suitable cooling medium D. any one of these The lower critical temperature A. decreases as the carbon content in steel increases B. increases as the carbon content in steel increases C. is same for all steels D. depends upon the rate of heating Nodular cast iron is produced by adding __________ to the molten cast iron. A. nickel B. chromium C. copper D. magnesium Free carbon in iron makes the metal A. soft and gives a coarse grained crystalline structure B. soft and gives a fine grained crystalline structure C. hard and gives a coarse grained crystalline structure D. hard and gives a fine grained crystalline structure The cupola is used to manufacture A. pig iron B. cast iron C. wrought iron D. steel The type of space lattice found in gamma-iron is A. face centred cubic space lattice B. body centred cubic space lattice C. close packed hexagonal space lattice D. none of these The property of a material due to which it breaks with little permanent distortion, is called A. brittlen ess B. ductility C. malleability D. plasticity Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities? A. Sulphur B. Phosphorus C. Manganese D. Silicon The hardness of steel depends upon the A. amount of cementite it contains B. amount of carbon it contains C. contents of alloying elements D. method of manufacture of steel Cartidge brass can be A. cold rolled into sheets B. drawn into wires C. formed into tube D. any one of these
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Mechanical Engg

Sep 03, 2015

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Mechanical Engg
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Iron ore is, usually, found in the form of

A.

oxides

B.

carbonates

C.

sulphides

D.

all of these

The hardness of steel increases if it contains

A.

pearlite

B.

ferrite

C.

cementite

D.

martensite

In full annealing, the hypo-eutectoid steel is heated from 30 C to 50 C above the upper critical temperature and then cooled

A.

in still air

B.

slowly in the furnace

C.

suddenly in a suitable cooling medium

D.

any one of these

The lower critical temperature

A.

decreases as the carbon content in steel increases

B.

increases as the carbon content in steel increases

C.

is same for all steels

D.

depends upon the rate of heating

Nodular cast iron is produced by adding __________ to the molten cast iron.

A.

nickel

B.

chromium

C.

copper

D.

magnesium

Free carbon in iron makes the metal

A.

soft and gives a coarse grained crystalline structure

B.

soft and gives a fine grained crystalline structure

C.

hard and gives a coarse grained crystalline structure

D.

hard and gives a fine grained crystalline structure

The cupola is used to manufacture

A.

pig iron

B.

cast iron

C.

wrought iron

D.

steel

The type of space lattice found in gamma-iron is

A.

face centred cubic space lattice

B.

body centred cubic space lattice

C.

close packed hexagonal space lattice

D.

none of these

The property of a material due to which it breaks with little permanent distortion, is called

A.

brittleness

B.

ductility

C.

malleability

D.

plasticity

Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

A.

Sulphur

B.

Phosphorus

C.

Manganese

D.

Silicon

The hardness of steel depends upon the

A.

amount of cementite it contains

B.

amount of carbon it contains

C.

contents of alloying elements

D.

method of manufacture of steel

Cartidge brass can be

A.

cold rolled into sheets

B.

drawn into wires

C.

formed into tube

D.

any one of these

Which of the following statement is correct?

A.

The product produced by blastfurnace is called cast iron.

B.

The pig iron is the name given to the product produced by cupola.

C.

The cast iron has high tensile strength.

D.

The chilled cast iron has no graphite.

Blast furnace is used to produce

A.

pig iron

B.

cast iron

C.

wrought iron

D.

steel

Which of the following statements are true for annealing of steels?

A.

Steels are heated to 500 to 700 C

B.

Cooling is done slowly and steadily

C.

Internal stresses are relieved

D.

all of these

Which of the following steel making process is being adopted at Rourkela Steel Plant?

A.

Bessemer process

B.

Open-hearth process

C.

Electric process

D.

L-D process

18-4-1 high speed steel contains

A.

vanadium 4%, chromium 18% and tungsten 1%

B.

vanadium 1%, chromium 4% and tungsten 18%

C.

vanadium 18%, chromium 1% and tungsten 4%

D.

none of the above

Grey cast iron has

A.

carbon in the form of free graphite

B.

high tensile strength

C.

low compressive strength

D.

all of these

Induction hardening is basically a

A.

carburising process

B.

surface hardening process

C.

core-hardening process

D.

none of these

When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

A.

white cast iron

B.

nodular cast iron

C.

malleable cast iron

D.

alloy cast iron

The strength is the ability of a material to resist

A.

deformation under stress

B.

externally applied forces with breakdown or yielding

C.

fracture due to high impact loads

D.

none of these

The material widely used for making pendulums of clocks is

A.

stainless steel

B.

high speed steel

C.

heat resisting steel

D.

nickel steel

The stiffness is the ability of a material to resist

A.

deformation under stress

B.

fracture due to high impact loads

C.

externally applied forces with breakdown or yielding

D.

none of the above

The blade of a power saw is made of

A.

boron steel

B.

high speed steel

C.

stainless steel

D.

malleable cast iron

In induction hardening __________ is high.

A.

current

B.

voltage

C.

frequency

D.

temperature

The metal suitable for bearings subjected to light loads, is

A.

silicon bronze

B.

white metal

C.

monel metal

D.

phosphor bronze

The property of a material essential for spring materials is

A.

stiffness

B.

ductility

C.

resilience

D.

plasticity

Which of the following material has nearly zero coefficient of expansion?

A.

Stainless steel

B.

High speed steel

C.

Invar

D.

Heat resisting steel

The alloying element which can replace tungsten in high speed steels is

A.

nickel

B.

vanadium

C.

cobalt

D.

molybdenum

Which of the following is an amorphous material?

A.

Mica

B.

Silver

C.

Lead

D.

Glass

The machinability of steel is improved by adding

A.

nickel

B.

chromium

C.

nickel and chromium

D.

sulphur, lead and phosphorus

The carbon in the pig iron varies from

A.

0.1 to 0.5%

B.

0.5 to 1%

C.

1 to 5%

D.

5 to 10%

The type of space lattice found in alpha-iron is

A.

face centred cubic space lattice

B.

body centred cubic space lattice

C.

close packed hexagonal space lattice

D.

none of these

The brown smoke during the operation of a bessemer Converter indicates that the

A.

air is burning out silicon and managanese

B.

silicon and manganese has burnt and carbon has started oxidising

C.

the converter must be titled to remove the contents of the converter

D.

the brown smoke does not occur during the operation of a bessemer converter

Martensite has needle like structure and is magnetic.

A.

Correct

B.

Incorrect

Monel metal is an alloy of

A.

nickel and copper

B.

nickel and chromium

C.

nickel, chromium and iron

D.

copper and chromium

Which of the following display properties similar to that of steel?

A.

Blackheart cast iron

B.

Whiteheart cast iron

C.

both (a) and (b)

D.

none of these

When a low carbon steel is heated upto upper critical temperature

A.

there is no change in grain size

B.

the average grain size is a minimum

C.

the grain size increases very rapidly

D.

the grain size first increases and then decreases very rapidly

The steel widely used for motor car crankshafts is

A.

nickel steel

B.

chrome steel

C.

nickel-chrome steel

D.

silicon steel

Combined carbon in iron makes the metal

A.

soft and gives coarse grained crystalline structure

B.

soft and gives a fine grained crystalline structure

C.

hard and gives a coarse grained crystalline structure

D.

hard and gives a fine grained crystalline structure

Pearlite consists of

A.

13% carbon and 87% ferrite

B.

13% cementite and 87% ferrite

C.

13% ferrite and 87% cementite

D.

6.67% carbon and 93.33% iron

Quenching is not necessary when hardening is done by

A.

case hardening

B.

flame hardening

C.

nitriding

D.

any one of these

Beryllium bronze has

A.

high yield point

B.

high fatigue limit

C.

both (a) and (b)

D.

none of these

The aluminium alloy, mainly used, for anodized utensil manufacture, is

A.

duralumin

B.

Y-alloy

C.

magnalium

D.

hindalium

The toughness of a material __________ when it is heated.

A.

remains same

B.

decreases

C.

increases

The coordination number of a face centred cubic space lattice is

A.

six

B.

twelve

C.

eighteen

D.

twenty

Bronze is an alloy of

A.

copper and zinc

B.

copper and tin

C.

copper, tin and zinc

D.

none of these

Chromium when added to steel __________ the tensile strength.

A.

does not effect

B.

decreases

C.

increases

Which of the following is added in low carbon steels to prevent them from becoming porous?

A.

Sulphur

B.

Phosphorus

C.

Manganese

D.

Silicon

A steel with carbon __________ is known as hypo-eutectoid steel.

A.

0.8%

B.

below 0.8%

C.

above 0.8%

Free cutting steels

A.

contain carbon in free from

B.

require minimum cutting force

C.

is used where rapid machining is the prime requirement

D.

can be cut freely

The presence of hydrogen in steel causes

A.

reduced neutron absorption cross-section

B.

improved weldability

C.

embrittlement

D.

corrosion resistance

Tin base white metals are used where the bearings are subjected to

A.

large surface wear

B.

elevated temperatures

C.

light load and pressure

D.

high pressure and load

The charge of the blast furnace consists of

A.

calcined ore (8 parts ), coke (4 parts) and limestone (1 part)

B.

calcined ore (4 parts), coke (1 part) and limestone (8 parts)

C.

calcined ore (1 part), coke (8 part) and limestone (4 parts)

D.

calcined ore, coke and limestone all in equal parts

The ability of a material to resist fracture due to high impact loads, is called

A.

strength

B.

stiffness

C.

toughness

D.

brittleness

The purpose of heat treatment is to

A.

relieve the stresses set up in the material after hot or cold working

B.

modify the structure of the material

C.

change grain size

D.

any one of these

An alloy of copper, tin and zinc is known as

A.

brass

B.

bronze

C.

gun metal

D.

muntz metal

Which of the following iron exist between 910 C and 1403 C?

A.

-iron

B.

-iron

C.

-iron

D.

-iron

The material in which the atoms are arranged chaotically, is called

A.

amorphous material

B.

mesomorphous material

C.

crystalline material

D.

none of these

In basic bessemer process, the furnace is lined with

A.

silica bricks

B.

a mixture of tar and burnt dolomite bricks

C.

either (a) or (b)

D.

none of these

Normalising of steel is done to

A.

refine the grain structure

B.

remove strains caused by cold working

C.

remove dislocations caused in the internal structuure due to hot working

D.

all of the above

When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

A.

equal to

B.

less than

C.

more than

Shock resistance of steel is increased by adding

A.

nickel

B.

chromium

C.

nickel and chromium

D.

sulphur, lead and phosphorus

In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.

A.

sulphur

B.

phosphorus

C.

manganese

D.

silicon

A steel containing 16 to 18% chromium and about 0.12% carbon is called

A.

ferritic stainless steel

B.

austenitic stainless steel

C.

martensitic stainless steel

D.

nickel steel

The alloy, mainly used for corrosion resistance in stainless steels is

A.

silicon

B.

manganese

C.

carbon

D.

chromium

The temperature required for full annealing in hyper-eutectoid steel is

A.

30 C to 50 C above upper critical temperature

B.

30 C to 50 C below upper critical temperature

C.

30 C to 50 C above lower critical temperature

D.

30 C to 50 C below lower critical temperature

Which of the following metal shrinks most from molten state to solid state?

A.

Cast iron

B.

Cast steel

C.

Brass

D.

Admirality metal

A steel containing ferrite and pearlite is

A.

hard

B.

soft

C.

tough

D.

hard and tough

The defect which takes place due to imperfect packing of atoms during crystallisation is known as

A.

line defect

B.

surface defect

C.

point defect

D.

none of these

A coarse grained steel

A.

is less tough and has a greater tendency to distort during heat treatment

B.

is more ductile and has a less tendency to distort during heat treatment

C.

is less tough and has a less tendency to distort during heat treatment

D.

is more ductile and has a greater tendency to distort during heat treatment

Duralumin contains

A.

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

B.

3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

C.

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

D.

5 to 6% tin, 2 to 3% copper and rest aluminium

Age hardening is related to

A.

duralumin

B.

brass

C.

copper

D.

silver

The addition of which of the following improves machining of copper?

A.

Sulphur

B.

Vanadium

C.

Tin

D.

Zinc

When a medium carbon steel is heated to coarsening temperature,

A.

there is no change in grain size

B.

the average grain size is a minimum

C.

the grain size increases very rapidly

D.

the grain size first increases and then decreases very rapidly

Delta-iron occurs between the temperature range of

A.

400C to 600C

B.

600C to 900C

C.

900C to 1400C

D.

1400C to 1530C

White cast iron has

A.

carbon in the form of carbide

B.

low tensile strength

C.

high compressive strength

D.

all of these

Iron-carbon alloys containing carbon __________ 4.3% are known as hyper-eutectic cast irons.

A.

equal to

B.

less than

C.

more than

In low carbon steels, presence of small quantities of sulphur improves

A.

weldability

B.

formability

C.

machinability

D.

hardenability

The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called

A.

duralumin

B.

Y-alloy

C.

magnalium

D.

hindalium

Y-alloy contains

A.

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

B.

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

C.

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

D.

5 to 6% tin, 2 to 3% copper and rest aluminium

The main alloying elements high speed steel in order of increasing proportion are

A.

vanadium, chromium, tungsten

B.

tungsten, titanium, vanadium

C.

chromium, titanium, vanadium

D.

tungsten, chromium, titanium

Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

A.

Babbit metal

B.

Monel metal

C.

Nichrome

D.

Phosphor bronze

Which of the following metal is used for nuclear energy?

A.

Uranium

B.

Thorium

C.

Niobium

D.

all of these

The bond formed by transferring electrons from one atom to another is called

A.

ionic bond

B.

covalent bond

C.

metallic bond

D.

none of these

Which of the following property is desirable in parts subjected to shock and impact loads?

A.

Strength

B.

Stiffness

C.

Brittleness

D.

Toughness

German silver contains

A.

1% silver

B.

2% silver

C.

5% silver

D.

no silver

Connecting rod is, usually, made from

A.

low carbon steel

B.

high carbon steel

C.

medium carbon steel

D.

high speed steel

Which of the following inpurity in cast iron makes it hard and brittle?

A.

Silicon

B.

Sulphur

C.

Manganese

D.

Phosphorus

There are fourteen atoms in a unit cell of

A.

body centred cubic space lattice

B.

face centred cubic space lattice

C.

close packed hexagonal space lattice

D.

none of these

The maximum internal diameter of a blast furnace is about

A.

3 m

B.

6 m

C.

9 m

D.

12 m

In spheroidising process, the steel is

A.

heated below the lower critical temperature and then cooled slowly

B.

heated upto the lower critical temperature and then cooled in still air

C.

heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600C

D.

none of the above

Pearlite is a combination of 87% ferrite and 13% cementite.

A.

Yes

B.

No

The percentage carbon content in wrought iron is about

A.

0.02

B.

0.1

C.

02

D.

0.4

The alloying element which reduces the formation of iron sulphide in steel is

A.

chromium

B.

nickel

C.

vanadium

D.

manganese

For a steel containing 0.8% carbon

A.

there is no critical point

B.

there is only one critical point

C.

there are two critical points

D.

there can be any number of critical points

In high speed steels, manganese is used to tougher the metal and to increase its

A.

yield point

B.

critical temperature

C.

melting point

D.

hardness

The machinability of aluminium increases when __________ is added to aluminium.

A.

copper

B.

magnesium

C.

silicon

D.

lead and bismuth

Body centred cubic space lattice is found in

A.

zinc, magnesinm, cobalt, cadmium, antimony and bismuth

B.

gamma-iron, aluminium, copper, lead, silver and nickel

C.

alpha-iron, tungsten, chromium and molybdenum

D.

none of the above

When a low carbon steel is heated upto lower critical temperature,

A.

there is no change in grain size

B.

the average grain size is a minimum

C.

the grain size increases very rapidly

D.

the grain size first increases and then decreases very rapidly

The silicon steel is widely used for

A.

connecting rods

B.

cutting tools

C.

generators and transformers in the form of laminated cores

D.

motor car crankshafts

Ball bearings are, usually, made from

A.

low carbon steel

B.

high carbon steel

C.

medium carbon steel

D.

chrome steel

Macro-structure of a material is, generally, examined by

A.

naked eye

B.

optical microscope

C.

metallurgical microscope

D.

X-ray techniques

Which of the following property is desirable for materials used in tools and machines?

A.

Elasticity

B.

Plasticity

C.

Ductility

D.

Malleability

Babbit metal is a

A.

lead-base alloy

B.

copper-base alloy

C.

tin-base alloy

D.

cadmium-base alloy

The metal suitable for bearings subjected to heavy loads, is

A.

silicon bronze

B.

white metal

C.

monel metal

D.

phosphor bronze

The compressive strength of cast iron is __________ that of its tensile strength.

A.

equal to

B.

less than

C.

more than

When a steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

A.

mainly ferrite

B.

mainly pearlite

C.

ferrite and pearlite

D.

pearlite and cementite

Eutectoid reaction occurs at

A.

600C

B.

723C

C.

1147C

D.

1493C

Nickel when added to copper improves

A.

machinability

B.

hardness

C.

hardness and strength

D.

strength and ductility

In the lower part of the blast furnace (zone of fusion), the temperature is

A.

400 to 700C

B.

800C to 1000C

C.

1200C to 1300C

D.

1500C to 1700C

Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

A.

Silicon

B.

Sulphur

C.

Manganese

D.

Phosphorus

Which of the following statement is wrong?

A.

A steel with 0.8% carbon is wholly pearlite

B.

The amount of cementite increases with the increase in percentage of carbon in iron

C.

A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

D.

The cementite is identified as round particles in the structure

Inconel contains

A.

65% nickel, 15% chromium and 20% iron

B.

68% nickel, 29% copper and 3% other constituents

C.

80% nickel and 20% chromium

D.

80% nickel, 14% chromium and 6% iron

Segmental chips are formed during machining

A.

mild steel

B.

cast iron

C.

high speed steel

D.

high carbon steel

Segmental chips are formed during machining

A.

mild steel

B.

cast iron

C.

high speed steel

D.

high carbon steel

If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is

A.

conical locator

B.

cylindrical locator

C.

diamond pin locator

D.

vee locator

Side rake angle of a single point cutting tool is the angle

A.

by which the face of the tool is inclined towards back

B.

by which the face of the tool is inclined sideways

C.

between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of the tool

D.

between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base

Internal gears can be made by

A.

hobbing

B.

shaping with pinion cutter

C.

shaping with rack cutter

D.

milling

In order to prevent tool from rubbing the work __________ on tools are provided.

A.

rake angles

B.

relief angles

The silicon carbide abrasive is chiefly used for grinding

A.

cemented carbide

B.

ceramic

C.

cast iron

D.

all of these

Drilling is an example of

A.

orthogonal cutting

B.

oblique cutting

C.

simple cutting

D.

uniform cutting

When the cutting edge of the tool is dull, then during machining

A.

continuous chips are formed

B.

discontinuous chips are formed

C.

continuous chips with built-up edge are formed

D.

no chips are formed

Cast iron during machining produces

A.

continuous chips

B.

discontinuous chips

C.

continuous chips with built-up-edge

D.

none of these

A single point thread cutting tool should ideally have

A.

zero rake angle

B.

positive rake angle

C.

negative rake angle

D.

point angle

The work or surface speed for cylindrical grinding varies from

A.

5 to 10 m/min

B.

10 to 20 m/min

C.

20 to 30 m/min

D.

40 to 60 m/min

The cutting tool in a milling machine is mounted on

A.

spindle

B.

arbor

C.

column

D.

knee

The tool made of cemented carbide wear out faster at

A.

slow speeds

B.

medium speeds

C.

fast speeds

D.

very fast speeds

A push broach as compared to pull broach

A.

has less number of teeth

B.

is short and stocky

C.

removes less material for each pass of the tool

D.

all of the above

Twist drills are made of

A.

high speed steel

B.

carbon steel

C.

stainless steel

D.

either (a) or (b)

A twist drill is a

A.

side cutting tool

B.

front cutting tool

C.

end cutting tool

D.

none of these

The rake angle required to machine brass by high speed steel tool is

A.

0

B.

10

C.

20

D.

-10

The lip angle of a single point tool is usually

A.

20 to 40

B.

40 to 60

C.

60 to 80

D.

none of these

The average cutting speed for turning brass with a high speed steel tool is

A.

15 to 19 m/min

B.

25 to 31 m/min

C.

60 to 90 m/min

D.

90 to 120 m/min

The maximum production of small and slender parts is done by

A.

watch maker's lathe

B.

sliding head stock automatic lathe

C.

multispindle automatic lathe

D.

capastan lathe

The method of grinding used to produce a straight or tapered surface on a workpiece, is

A.

internal cylindrical grinding

B.

form grinding

C.

external cylindrical grinding

D.

surface grinding

Crater wear occurs mainly on the

A.

nose part, front relief face and side relief face of the cutting tool

B.

face of the cutting tool at a short distance from the cutting edge only

C.

cutting edge only

D.

front face only

Gear lapping is an operation

A.

after heat treatment

B.

prior to heat treatment

C.

for gear reconditioning

D.

none of these

The facing is an operation of

A.

bevelling the extreme end of a workpiece

B.

embossing a diamond shaped pattern on the surface of a workpiece

C.

reducing the diameter of a workpiece over a very narrow surface

D.

machining the ends of a workpiece to produce a flat surface square with the axis

A fixture is defined as a device which

A.

holds and locates a workpiece and guides and controls one or more cutting tools

B.

holds and locates a workpiece during an inspection or for a manufacturing operation

C.

is used to check the accuracy of workpiece

D.

all of the above

A drill considered as a cutting tool having zero rake, is known as a

A.

flat drill

B.

straight fluted drill

C.

parallel shank twist drill

D.

tapered shank twist drill

Which of the following statement is wrong about ultra-sonic machining?

A.

It is best suited for machining hard and brittle materials.

B.

It cuts materials at very slow speeds.

C.

It removes large amount of material.

D.

It produces good surface finish.

Larger end cutting edge angle __________ tool life.

A.

increases

B.

decreases

C.

does not effect

The lead screw of a lathe has __________ threads.

A.

single start

B.

double start

C.

multi-start

D.

any one of these

The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is

A.

carbide, ceramic, cermet, borazon

B.

ceramic, carbide, borazon, cermet

C.

cermet, carbide, ceramic, borazon

D.

borazon, ceramic, carbide, cermet

In the relationVTn=C, the value of n for carbide tools is

A.

0.1 to 0.2

B.

0.20 to 0.25

C.

0.25 to 0.40

D.

0.40 to 0.55

In up milling, the thickness of chip is

A.

minimum at the beginning of the cut and maximum at the end of the cut

B.

maximum at the beginning of the cut and minimum at the end of the cut

C.

uniform throughout the cut

D.

none of these

The machining of titanium is difficult due to

A.

high thermal conductivity of titanium

B.

chemical reaction between tool and work

C.

low tool-chip contact area

D.

none of these

Lapping is an operation of

A.

making a cone-shaped enlargement of the end of a hole

B.

smoothing and squaring the surface around a hole

C.

sizing and finishing a small diameter hole

D.

producing a hole by removing metal along the circumference of a hollow cutting tool

The different spindle speeds on a lathe form

A.

arithmetical progression

B.

geometrical progression

C.

harmonical progression

D.

any one of these

If the helix angle of the drill is made __________ 30, then the torque required to drive the drill at a given feed will be more.

A.

equal to

B.

less than

C.

more than

In hot machining, tool is made of

A.

tungsten carbide

B.

brass or copper

C.

diamond

D.

stainless steel

In ultra-sonic machining, the metal is removed by

A.

using abrasive slurry between the tool and work

B.

direct contact of tool with the work

C.

maintaining an electrolyte between the work and tool in a very small gap between the two

D.

erosion caused by rapidly recurring spark discharges between the tool and work

Grinding wheels should be tested for balance

A.

only at the time of manufacture

B.

before starting the grinding operation

C.

at the end of grinding operation

D.

occasionally

The example of snag grinding is

A.

trimming the surface left by sprues and risers on castings

B.

grinding the parting line left on castings

C.

removing flash on forgings

D.

all of these

The angle between the shear plane and __________ is called shear angle.

A.

work surface

B.

tool face

Which of the following parameters influence the axial feed rate in centreless grinding?

A.

Regulating wheel diameter

B.

Speed of the regulating wheel

C.

Angle between the axes of grinding and regulating wheels

D.

all of the above

The lathe spindles are usually made hollow and provided with

A.

internal taper

B.

external taper

C.

internal and external taper

D.

no taper

The top and sides of the table of a shaper usually have

A.

L-type slots

B.

T-type slots

C.

I-type slots

D.

any one of these

The binding material used in cemented carbide tools is

A.

tungsten

B.

chromium

C.

silicon

D.

cobalt

In machining metals, chips break due to __________ of work material.

A.

toughness

B.

ductility

C.

elasticity

D.

work hardening

For softer materials, the point angle of the drill is kept

A.

equal to 118

B.

less than 118

C.

more than 118

D.

any one of these

High speed steel drills can be operated at about __________ the speed of high carbon steel drills.

A.

one-half

B.

one-fourth

C.

double

D.

four times

When the end of a tap is tapered for about three or four threads, it is known as a

A.

taper tap

B.

bottoming tap

C.

second tap

D.

none of these

The rear teeth of a broach

A.

perform burnishing operation

B.

remove minimum metal

C.

remove maximum metal

D.

remove no metal

Crater wear is predominant in

A.

carbon tool steels

B.

tungsten carbide tools

C.

high speed steel tools

D.

ceramic tools

The method of centreless grinding used to produce taper is

A.

infeed grinding

B.

through feed grinding

C.

endfeed grinding

D.

any one of these

In a shaper, the length of stroke is increased by

A.

increasing the centre distance of bull gear and crank pin

B.

decreasing the centre distance of bull gear and crank pin

C.

increasing the length of the arm

D.

decreasing the length of the slot in the slotted lever

Trepanning is an operation of

A.

making a cone-shaped enlargement of the end of a hole

B.

smoothing and squaring the surface around a hole

C.

sizing and finishing a small diameter hole

D.

producing a hole by removing metal along the circumference of a hollow cutting tool

The abrasive recommended for grinding materials of high tensile strength is

A.

silicon carbide

B.

aluminium oxide

C.

sand stone

D.

diamond

The factor responsible for the formation of continuous chips with built up edge is

A.

low cutting speed and large rake angle

B.

low cutting speed and small rake angle

C.

high cutting speed and large rake angle

D.

high cutting speed and small rake angle

An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is

A.

cutting speed

B.

feed rate

C.

shear angle

D.

tool geometry

In centreless grinding, the surface speed of regulating wheel is

A.

5 to 15 m/min

B.

15 to 60 m/min

C.

60 to 90 m/min

D.

90 to 120 m/min

In metal cutting, use of low feeds and high cutting speeds is desired when the objective is

A.

high metal removal rate

B.

dry machining

C.

use of soft cutting tool

D.

surface finish

The angle on which the strength of the tool depends is

A.

rake angle

B.

cutting angle

C.

clearance angle

D.

lip angle

Larger than 15 side cutting edge angle

A.

increases tool life

B.

decreases tool life

C.

produces chipping and decreases tool life

D.

results in excessive stress concentration and greater heat generation

Which of the following statement is correct for orthogonal cutting system?

A.

The cutting edge of the tool is perpendicular to the direction of tool travel.

B.

The cutting edge clears the width of the workpiece on either ends.

C.

The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge.

D.

all of the above

The angle made by the face of the tool and the plane parallel to the base of cutting tool is called

A.

rake angle

B.

cutting angle

C.

clearance angle

D.

lip angle

In metal machining, the work-tool contact zone is a zone where heat is generated due to

A.

plastic deformation of metal

B.

burnishing friction

C.

friction between the moving chip and the tool face

D.

none of the above

Thread grinding requires work speed from

A.

1 to 3 m/min

B.

5 to 10 m/min

C.

10 to 14 m/min

D.

14 to 20 m/min

Threading is an operation of

A.

smoothing and squaring the surface around a hole

B.

sizing and finishing a small diameter hole

C.

producing a hole by removing metal along the circumference of a hollow cutting tool

D.

cutting helical grooves on the external cylindrical surface

Glazing in grinding wheels can be decreased by

A.

using a harder wheel or by increasing the wheel speed

B.

using a softer wheel or by decreasing the wheel speed

C.

using a harder wheel or by decreasing the wheel speed

D.

using a softer wheel or by increasing the wheel speed

The cutting speed is minimum while machining __________ with a high speed steel tool.

A.

cast iron

B.

mild steel

C.

brass

D.

aluminium

A process of removing metal by pushing or pulling a cutting tool is called

A.

up milling

B.

down milling

C.

forming

D.

broaching

The hardness of a grinding wheel is specified by

A.

Brinell hardness number

B.

Rockwel! hardness number

C.

Vickers pyramid number

D.

letter of alphabet

Which of the following operations can be performed with milling cutters?

A.

cutting key ways on shafts

B.

cutting external screw threads

C.

cutting teeth of spur gears

D.

all of these

While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is

A.

independent of index change gear ratio

B.

dependent on speed change gear ratio

C.

inter-related to index change gear ratio

D.

independent of speed and index change gear ratio

The swing diameter over the bed is __________ the height of the centre measured from the bed of the lathe.

A.

equal to

B.

twice

C.

thrice

D.

one-half

In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is

A.

cylindrical grinder

B.

internal grinder

C.

surface grinder

D.

tool and cutter grinder

Down milling is also called

A.

conventional milling

B.

climb milling

C.

end milling

D.

face milling

Any number of equal divisions can be obtained on milling machine by

A.

direct indexing

B.

simple indexing

C.

compound indexing

D.

differential indexing

The depth of cut in drilling is __________ the drill diameter.

A.

equal to

B.

one-fourth

C.

one-half

D.

double

The type of tool used on lathe, shaper and planer is

A.

single point cutting tool

B.

two point cutting tool

C.

three point cutting tool

D.

multi-point cutting tool

A __________ grinding wheel is used to grind soft materials.

A.

coarse grained

B.

medium grained

C.

finegrained

The relation between tool life (T) and cutting speed (V) isVTn= Constant. In this relation, the value of n depends upon

A.

work material

B.

tool material

C.

working conditions

D.

type of chip produced

In order to grind soft material

A.

coarse grained grinding wheel is used

B.

fine grained grinding wheel is used

C.

medium grained grinding wheel is used

D.

any one of these

In centreless grinders, the maximum angular adjustment of the regulating wheel is

A.

5

B.

10

C.

15

D.

20

The type of reamer used for reaming operation in a blind hole, is

A.

straight fluted reamer

B.

left hand spiral fluted reamer

C.

right hand spiral fluted reamer

D.

any one of these

In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as

A.

side relief angle

B.

end relief angle

C.

back rake angle

D.

side rake angle

A set of eight form relieved milling cutters for each module is provided to enable cutting of gears of different

A.

materials

B.

types of gears

C.

number of teeth

D.

width of gears

The guideways are of

A.

flat type

B.

V-type

C.

dovetail type

D.

any one of these

The snag grinding is done

A.

to produce good surface finish and high degree of accuracy

B.

to remove considerable amount of metal without regard to accuracy of the finished surface

C.

to grind exterior cylindrical surfaces

D.

any one of the above

The velocity of tool along the tool face is known as

A.

shear velocity

B.

chip velocity

C.

cutting velocity

D.

mean velocity

The purpose of jigs and fixtures is to

A.

increase machining accuracy

B.

facilitate interchangeability

C.

decrease expenditure on quality control

D.

all of these

The trade name of a non-ferrous cast alloy composed of cobalt, chromium and tungsten is called

A.

ceramic

B.

stellite

C.

diamond

D.

cemented carbide

In which of the following milling machine, the table can be tilted in a vertical plane by providing a swivel arrangement at the knee?

A.

Universal milling machine

B.

Plain milling machine

C.

Omniversal milling machine

D.

Hand milling machine

A coarse grained grinding wheel is used to grind

A.

hard and brittle materials

B.

soft and ductile materials

C.

hard and ductile materials

D.

soft and brittle materials

The abrasive slurry used in ultra-sonic machining contains fine particles of

A.

aluminium oxide

B.

boron carbide

C.

silicon carbide

D.

any one of these

High speed steel cutting tools operate at cutting speeds __________ than carbon steel tools.

A.

2 to 3 times lower

B.

2 to 3 times higher

C.

5 to 8 times higher

D.

8 to 20 times higher

The factor which affects the tool life is

A.

tool geometry

B.

cutting speed

C.

feed rate

D.

all of these

In lapping operaion, the amount of metal removed is

A.

0.005 to 0.01 mm

B.

0.01 to 0.1 mm

C.

0.05 to 0.1 mm

D.

0.5 to 1 mm

The cutting force in up milling __________ per tooth movement of the cutter.

A.

is zero

B.

is maximum

C.

decreases from maximum to zero

D.

increases from zero to maximum

The height of each tooth of a broach is

A.

same throughout

B.

in progressively decreasing order

C.

in progressively increasing order

D.

none of these

The surface finish is improved by the increase in

A.

cutting speed

B.

nose radius

C.

true rake angle

D.

all of these

The cutting speed for drilling copper with high speed steel drills varies from

A.

10 to 20 m/min

B.

18 to 30 m/min

C.

24 to 45 m/min

D.

60 to 90 m/min

High speed steel tools retain their hardness upto a temperature of

A.

250C

B.

350C

C.

500C

D.

900C

A taper tap has

A.

its end tapered for about three or four threads

B.

its end tapered for about eight or ten threads

C.

full threads for the whole of its length

D.

none of the above

For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of

A.

50C

B.

100C

C.

175C

D.

275C

The material which on machining produces chips with built up edge is

A.

brittle material

B.

tough material

C.

hard material

D.

ductile material

In down milling, the thickness of chip is

A.

minimum at the beginning of the cut and maximum at the end of the cut

B.

maximum at the beginning of the cut and minimum at the end of the cut

C.

uniform throughout the cut

D.

none of these

The chuck used for setting up of heavy and irregular shaped work should be

A.

four jaw independent chuck

B.

three jaw universal chuck

C.

magnetic chuck

D.

drill chuck

Which of the following operations is carried out at a minimum cutting velocity if the machines are equally rigid and the tool work materials are the same?

A.

Turning

B.

Grinding

C.

Boring

D.

Milling

Ceramic tools are fixed to tool body by

A.

soldering

B.

brazing

C.

welding

D.

clamping

The soft grade grinding wheels are denoted by the letters

A.

AtoH

B.

ItoP

C.

QtoZ

D.

AtoP

The helix angle of a drill is __________ for drilling brass.

A.

equal to 30

B.

less than 30

C.

more than 30

In continuous chip cutting, the maximum heat __________ the velocity of cutting.

A.

depends upon

B.

does not depend upon

The size of a shaper is given by

A.

stroke length

B.

motor power

C.

mass of machine

D.

rate size

The main purpose of a boring operation, as compared to drilling, is to

A.

drill a hole

B.

finish the drilled hole

C.

correct the hole

D.

enlarge the existing hole

Carbide tipped tools usually have

A.

negative rake angle

B.

positive rake angle

C.

any rake angle

D.

no rake angle

Gear burnishing is a process for

A.

surface finishing

B.

under-cut gears

C.

cycloidal gears

D.

removing residual stresses from teeth roots

The saw milling is an operation of

A.

producing grooves around the periphery of a cylindrical or conical workpiece

B.

producing narrow slots or grooves on a workpiece

C.

reproduction of an outline of a template on a workpiece

D.

machining several surfaces of a workpiece simultaneously

The high cutting speed and large rake angle of the tool will result in the formation of

A.

continuous chips

B.

discontinuous chip

C.

continuous chips with built up edge

D.

none of these

In oblique cutting system, the maximum chip thickness

A.

occurs at the middle

B.

may not occur at the middle

C.

depends upon the material of the tool

D.

depends upon the geometry of the tool

Dielectric is used in

A.

electro-chemical machining

B.

ultra-sonic machining

C.

electro-discharge machining

D.

laser machining

The type of reamer used for reaming soft aluminium or copper, is

A.

straight fluted reamer

B.

left hand spiral fluted reamer

C.

right hand spiral fluted reamer

D.

any one of these

The tool material, for faster machining, should have

A.

wear resistance

B.

red hardness

C.

toughness

D.

all of these

In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become

A.

half

B.

two times

C.

eight times

D.

sixteen times

A twist drill is specified by its

A.

shank, material and diameter

B.

shank, lip angle and size of flute

C.

material, length of body and helix angle

D.

any one of these

The hole to be drilled for tapping is __________ the outside diameter of the thread on the tap.

A.

equal to

B.

smaller than

C.

greater than

Glazing in grinding wheels takes place when the

A.

wheel is too hard or wheel revolves at a very high speed

B.

wheel is too soft or wheel revolves at a very slow speed

C.

wheel is too hard and wheel revolves at very slow speed

D.

wheel is too soft and wheel revolves at a very high speed

Low helix angle drills are preferred for drilling holes in

A.

plastics

B.

copper

C.

cast steel

D.

carbon steel

In which of the following machine, the work remains stationary and the tool is rotated?

A.

Vertical boring machine

B.

Horizontal boring machine

C.

Precision boring machine

D.

Jig boring machine

The cutting speed of a drill depends upon the

A.

material of drill

B.

type of material to be drilled

C.

quality of surface finish desired

D.

all of these

The chamfering is an essential operation after

A.

knurling

B.

rough turning

C.

boring

D.

thread cutting

Ultra-sonic machining is best suited for

A.

tool steels

B.

sintered carbides

C.

glass

D.

all of these

The tap used to cut threads in a blind hole is

A.

taper tap

B.

second tap

C.

bottoming tap

D.

any one of these

A mandrel is used to hold

A.

an eccentric work

B.

a heavy work

C.

a thin work

D.

none of these

The size of abrasive grain required in a grinding wheel depends upon the

A.

amount of material to be removed

B.

hardness of material being ground

C.

finish desired

D.

all of these

A grinding wheel is said to be of __________ if it holds the abrasive grains more securely.

A.

soft grade

B.

medium grade

C.

hard grade

Gears can be best produced on mass production by

A.

shaping

B.

casting

C.

forming

D.

hobbing

In drilling operation, the metal is removed by

A.

shearing

B.

extrusion

C.

shearing and extrusion

D.

shearing and compression

A single point tool has

A.

rake angle

B.

cutting angle

C.

lip angle

D.

all of these

The type of tool used on milling machine and broaching machine is

A.

single point cutting tool

B.

two point cutting tool

C.

three point cutting tool

D.

multi-point cutting tool

When the tool moves parallel to the lathe axis, the movement is termed as

A.

cross feed

B.

angular feed

C.

longitudinal feed

D.

any one of these

In the relationVTn=C, the value of n for ceramic tools is

A.

0.1 to 0.2

B.

0.20 to 0.25

C.

0.25 to 0.40

D.

0.40 to 0.55

Chip breakers are used to

A.

increase tool life

B.

remove chips from bed

C.

break the chips into short segments

D.

to minimise heat generation

The actual feed in centreless grinders is given by (whered= Dia. of regulating wheel,n= Revolutions per minute, and = Angle of inclination of wheel)

A.

d

B.

d n

C.

d nsin

D.

d ncos

Which of the following process is used for preparing parts having large curved surfaces and thin sections?

A.

Hot machining

B.

Ultra-sonic machining

C.

ECM process

D.

Chemical milling

A grinding wheel becomes glazed (i.e. cutting edge takes a glass-like appearance) due to

A.

wear of bond

B.

breaking of abrasive grains

C.

wear of abrasive grains

D.

cracks on grinding wheel

A dynamometer is a device used for the measurement of

A.

chip thickness ratio

B.

forces during metal cutting

C.

wear of the cutting tool

D.

deflection of the cutting tool

In electro-discharge machining, tool is made of

A.

brass

B.

copper

C.

copper tungsten alloy

D.

all of these

The cutting speed is maximum while machining __________ with a high speed steel tool.

A.

cast iron

B.

mild steel

C.

brass

D.

aluminium

The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called

A.

helix or rake angle

B.

point angle

C.

chisel edge angle

D.

lip clearance angle

An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as

A.

counter-boring

B.

grooving

C.

knurling

D.

facing

The lathe centres are provided with standard taper known as

A.

Morse taper

B.

Seller's taper

C.

Chapman taper

D.

Brown and Sharpe taper

In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called

A.

face

B.

fillet

C.

land

D.

lead

The grooving is an operation of

A.

bevelling the extreme end of a workpiece

B.

embossing a diamond shaped pattern on the surface of a workpiece

C.

reducing the diameter of a workpiece over a very narrow surface

D.

enlarging the end of a hole cylindrically

Cutting fluids are used to

A.

cool the tool

B.

improve surface finish

C.

cool the workpiece

D.

all of these

The cutting fluid mostly used for machining alloy steels is

A.

water

B.

soluble oil

C.

dry

D.

sulphurised mineral oil

Tool life is generally better when

A.

grain size of the metal is large

B.

grain size of the metal is small

C.

hard constituents are present in the microstructure of the tool material

D.

none of the above

In reaming process

A.

metal removal rate is high

B.

high surface finish is obtained

C.

high form accuracy is obtained

D.

high dimensional accuracy is obtained

The lathe spindles at the nose end have

A.

internal screw threads

B.

external screw threads

C.

no threads

D.

tapered threads

Flank wear occurs mainly on the

A.

nose part, front relief face and side relief face of the cutting tool

B.

face of the cutting tool at a short distance from the cutting edge

C.

cutting edge only

D.

front face only

The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called

A.

truing

B.

dressing

C.

facing

D.

clearing

The cutting angle of a flat drill varies from

A.

3 to 8

B.

20 to 30

C.

60 to 90

D.

90 to 120

In metal cutting operations, the shear angle is the angle made by the shear plane with the

A.

direction of the tool axis

B.

direction of tool travel

C.

perpendicular to the direction of the tool axis

D.

central plane of the workpiece

The operation of smoothing and squaring the surface around a hole is known as

A.

counter-sinking

B.

counter-boring

C.

trepanning

D.

spot facing

The ductile materials, during machining, produce

A.

continuous chips

B.

discontinuous chips

C.

continuous chips with built up edge

D.

either (a) or (c)

Slow speed of the spindle is necessary in

A.

thread cutting

B.

turning a work of larger diameter

C.

turning a hard or tough material

D.

all of these

A zinc diffusion process is called

A.

galvanising

B.

anodising

C.

parkerising

D.

sherardizing

The accuracy of micrometers, calipers, dial indicators can be checked by a

A.

feeler gauge

B.

slip gauge

C.

ring gauge

D.

plug gauge

The type of file used for a wood work is

A.

single-cut file

B.

double cut file

C.

rasp-cut file

D.

any one of these

A taper provided on the pattern for its easy and clean withdrawl from the mould is known as

A.

machining allowance

B.

draft allowance

C.

shrinkage allowance

D.

distortion allowance

In arc welding, the electric arc is produced between the work and the electrode by

A.

voltage

B.

flow of current

C.

contact resistance

D.

all of these

In a centrifugal casting method

A.

core is made of sand

B.

core is made of ferrous metal

C.

core is made of non-ferrous metal

D.

no core is used

The draft or taper allowance on casting is generally

A.

1 to 2 mm/m

B.

2 to 5 mm/m

C.

5 to 10 mm/m

D.

10 to 15 mm/m

Which of the following welding process uses non-consumable electrodes?

A.

TIG welding

B.

MIG welding

C.

Manual arc welding

D.

Submerged arc welding

In a bilateral system of tolerance, the tolerance is allowed on

A.

one side of the actual size

B.

one side of the nominal size

C.

both sides of the actual size

D.

both sides of the nominal size

In a hot chamber die casting machine

A.

ferrous alloys with low melting temperature are casted

B.

ferrous alloys with high melting temperature are casted

C.

non-ferrous alloys with low melting temperature are casted

D.

non-ferrous alloys with high melting temperature are casted

The chisel used for cutting key ways is

A.

flat chisel

B.

cape chisel

C.

round nose chisel

D.

diamond pointed chisel

The temperature at which the new grains are formed in the metal is called

A.

lower critical temperature

B.

upper critical temperature

C.

eutectic temperature

D.

recrystallisation temperature

Thread rolling is restricted to

A.

ferrous materials

B.

ductile materials

C.

hard materials

D.

none of these

In sheet metal blanking, shear is provided on punches and dies so that

A.

press load is reduced

B.

good cut edge is obtained

C.

warping of sheet is minimised

D.

cut blanks are straight

In welding copper alloys with TIG arc welding

A.

direct current with straight polarity is used

B.

direct current with reversed polarity is used

C.

alternating current is used

D.

any one of these

The algebraic difference between the minimum limit and the basic size is called

A.

actual deviation

B.

upper deviation

C.

lower deviation

D.

fundamental deviation

The temperature of oxy-hydrogen flame is __________ oxy-acetylene flame.

A.

same as

B.

less than

C.

more than

Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes?

A.

Drawing

B.

Extrusion

C.

Rolling

D.

Extrusion and rolling

The fullers are used

A.

for finishing flat surfaces

B.

for necking down a piece of work

C.

for punching a hole

D.

to finish the punched hole

The cold chisels are made by

A.

drawing

B.

rolling

C.

piercing

D.

forging

The property of sand due to which it evolves a great amount of steam and other gases is called

A.

collapsibility

B.

permeability

C.

cohesiveness

D.

adhesiveness

The centrifugal casting method, is used for casting articles of

A.

symmetrical shape about vertical axis

B.

symmetrical shape about horizontal axis

C.

irregular shape

D.

non-ferrous metal only

Metal patterns are used for

A.

small castings

B.

large castings

C.

complicated castings

D.

large scale production of castings

The instrument which has all the features of try-square, bevel protractor, rule and scriber, is

A.

outside micrometer

B.

inside micrometer

C.

depth gauge micrometer

D.

combination set

When a hole or cavity to be cored is not in line with the parting surface, then a __________ is used.

A.

horizontal core

B.

vertical core

C.

drop core

D.

balanced core

The electrodes used in spot welding have a tip of

A.

stainless steel

B.

aluminium

C.

copper

D.

brass

The blank diameter used in thread rolling will be

A.

equal to minor diameter of the thread

B.

equal to pitch diameter of the thread

C.

a little larger than the minor diameter of the thread

D.

a little larger than the pitch diameter of the thread

The purpose of a riser is to

A.

deliver molten metal into the mould cavity

B.

act as a reservoir for the molten metal

C.

feed the molten metal to the casting in order to compensate for the shrinkage

D.

deliver the molten metal from pouring basin to gate

The cross-section of a chisel is usually

A.

rectangular

B.

square

C.

hexagonal

D.

octagonal

In back-hand welding, the angle between the welding torch and the work is kept as

A.

30-40

B.

40-50

C.

50-60

D.

60-70

In submerged arc welding, an arc is produced between a

A.

carbon electrode and the work

B.

metal electrode and the work

C.

bare metal electrode and the work

D.

two tungsten electrodes and the work

In shielded arc welding

A.

large electrode is used

B.

welding rod coated with slag is used

C.

welding rod coated with fluxing material is used

D.

none of the above

Blanking and piercing operations can be performed simultaneously in a

A.

simple die

B.

progressive die

C.

compound die

D.

combination die

A pattern maker's shrinkage rule considers

A.

all pattern allowances

B.

only shrinkage allowance

C.

all materials to be cast

D.

all materials of the pattern

The tolerance produced by shell moulding process of casting is

A.

+0.05 mm

B.

0.2 mm

C.

+0.5 mm

D.

1 mm

Galvanising is a

A.

zinc diffusion process

B.

process of coating zinc by hot dipping

C.

process used for making thin phosphate coating on steel

D.

none of the above

A two high rolling mill consists of two rolls which rotate

A.

at the same speed and in the same direction

B.

at the same speed but in opposite direction

C.

at different speeds and in the same direction

D.

at different speeds and in the opposite direction

Carburising flame is used to weld

A.

steel, cast iron, copper, aluminium etc

B.

brass and bronze

C.

hard surfacing materials such as stellite

D.

all of these

The electrode tip diameter (d) in spot welding should be equal to (wheret= Thickness of plate to be welded)

A.

t

B.

1.5t

C.

3t

D.

6t

Cores are used to

A.

form internal cavities in the casting

B.

improve mould surface

C.

form a part of a green sand mould

D.

all of these

During hot working of metals

A.

poor surface finish is produced

B.

scale is formed on the metal surface

C.

close tolerances can not be maintained

D.

all of these

When a pattern is made in three parts, the __________ is known as a drag.

A.

bottom part

B.

middle part

C.

top part

A jolt machine is used to

A.

ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

B.

ram the sand harder at the back of the mould and softer on the pattern face

C.

produce uniform sand hardness throughout the mould

D.

produce uniform packing of sand in the mould

A file removes the metal during

A.

forward stroke

B.

return stroke

C.

both forward and return strokes

D.

none of these

In spot welding, the spacing between two spot weld should not be less than

A.

d

B.

1.5d

C.

3d

D.

6d

In sheet metal work, he cutting force on the tool can be reduced by

A.

grinding the cutting edges sharp

B.

increasing the hardness of tool

C.

providing shear on tool

D.

increasing the hardness of die

In order to get uniform thickness of the plate by rolling process, one provides

A.

camber on the rolls

B.

offset on the rolls

C.

hardening of the rolls

D.

antifriction bearings

The cold working of metals is carried out

A.

at the recrystallisation temperature

B.

below the recrystallisation temperature

C.

above the recrystallisation temperature

D.

at any temperature

The shrinkage allowance for cast iron pattern is

A.

10 mm/m

B.

16 mm/m

C.

20 mm/m

D.

26 mm/m

A neutral flame is obtained by supplying

A.

equal volumes of oxygen and acetylene

B.

more volume of oxygen and less volume of acetylene

C.

more volume of acetylene and less volume of oxygen

D.

none of the above

An oxidising process used for aluminium and magnesium articles is called

A.

galvanising

B.

anodising

C.

parkerising

D.

sheradising

For welding plates of thickness less than 5 mm, its edges

A.

do not require bevelling

B.

should be bevelled to a single-V or U-groove

C.

should have a double-V or U-groove on one side

D.

should have a double-V or U-groove on both sides

In order to cut mild steel, the cutting angle of chisel should be

A.

30

B.

45

C.

50

D.

60

The operation of straightening a curved sheet metal, is known as

A.

drawing

B.

squeezing

C.

coining

D.

planishing

In a __________ , both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram.

A.

simple die

B.

progressive die

C.

combination die

D.

compound die

The operation of bending a sheet of metal along a curved axis, is known as

A.

plunging

B.

notching

C.

slitting

D.

forming

In a __________ , two or more operations are performed simultaneously at the single stroke of the ram.

A.

simple die

B.

progressive die

C.

combination die

D.

compound die

A rip saw

A.

is a two man saw

B.

is used for cutting along the grains of wood

C.

has a narrow blade with two wooden handles

D.

all of the above

For welding plates of thickness more than 12.5 mm, its edges

A.

do not require bevelling

B.

should be bevelled to a single-V or U-groove

C.

should have a double-V or U-groove on one side

D.

should have a double-V or U-groove on both sides

In electric resistance welding, voltage required for heating is

A.

1 to 5 volts

B.

6 to 10 volts

C.

11 to 20 volts

D.

50 to 100 volts

Most of the oxy-acetylene welding is done with

A.

neutral flame

B.

oxidising flame

C.

carburising flame

D.

all of these

The cutting edge of a chisel should be

A.

hardened

B.

tempered

C.

hardened and tempered

D.

case hardened

In order to check the clearance between two mating surfaces, a __________ gauge should be used.

A.

ring

B.

plug

C.

feeler

The current in electric resistance welding can be regulated by

A.

varying the input supply

B.

changing the primary turns of the transformer

C.

changing the secondary turns of the transformer

D.

any one of the above

A mortise gauge is a

A.

striking tool

B.

planing tool

C.

boring tool

D.

marking tool

The casting method adopted for ornaments and toys of non-ferrous alloys, is

A.

permanent mould casting

B.

slush casting

C.

die casting

D.

centrifugal casting

Structural sections such as rails, angles, I-beams are made by

A.

hot rolling

B.

hot drawing

C.

hot piercing

D.

hot extrusion

In welding magnesium with TIG arc welding, direct current with __________ is used.

A.

straight polarity

B.

reversed polarity

Cutting and forming operations can be performed in a single operation in a

A.

simple die

B.

progressive die

C.

compound die

D.

combination die

For cutting brass, the hacksaw blade should have __________ teeth per 25 mm.

A.

14

B.

24

C.

32

D.

40

A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as

A.

shift

B.

sand wash

C.

swell

D.

scab

The cold chisels are made from

A.

cast iron

B.

mild steel

C.

high speed steel

D.

cast tool steel

To prevent the body of the blade from jamming in the saw cut, the teeth of blade are

A.

strengthened

B.

sharpened

C.

set

D.

all of these

A ring gauge is used to

A.

check the diameter of shafts or studs

B.

test the accuracy of holes

C.

check the clearance between two mating surfaces

D.

all of the above

A casting defect which results in general enlargement of a casting is known as

A.

shift

B.

sand wash

C.

swell

D.

scab

Rotary swaging

A.

is extensively used for making bolts and rivets

B.

is used for reducing the diameters of round bars and tubes by rotating dies which open and close rapidly on the work

C.

is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface

D.

consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

The metal is subjected to mechanical working for

A.

refining grain size

B.

reducing original block into desired shape

C.

controlling the direction of flow lines

D.

all of these

During hot working of metals

A.

porosity of the metal is largely eliminated

B.

grain structure of the metal is refined

C.

mechanical properties are improved due to refinement of grains

D.

all of the above

The electron beam welding can be carried out in

A.

open air

B.

a shielded gas environment

C.

vacuum

D.

a pressurised inert gas chamber

The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called

A.

shearing

B.

piercing

C.

punching

D.

blanking

In die casting, machining allowance is

A.

small

B.

large

C.

very large

D.

not provided

A moving mandrel is used in

A.

wiredrawing

B.

tube drawing

C.

metal cutting

D.

forging

The most preferred process for casting gas turbine blades is

A.

die casting

B.

shell moulding

C.

investment moulding

D.

sand casting

The upsetting is a process of

A.

increasing the cross-section of a bar

B.

reducing the cross-section of a bar

C.

joining the two surfaces of metal under pressure after heating

D.

bending of a bar

Which of the following material can be used for making patterns ?

A.

Aluminium

B.

Wax

C.

Lead

D.

all of these

According to Indian standards, the total number of tolerance grades are

A.

8

B.

12

C.

18

D.

20

Loam sand is a mixture of

A.

30% sand and 70% clay

B.

50% sand and 50% clay

C.

70% sand and 30% clay

D.

90% sand and 10% clay

The oxy-acetylene gas used in gas welding produce a flame temperature of

A.

1800C

B.

2100C

C.

2400C

D.

3200C

For gas welding, the presure desired at the welding torch for acetylene is

A.

7 to 103 kN/m2

B.

70 to 280 kN/m2

C.

280 to 560 kN/m2

D.

560 to 840 kN/m2

The process extensively used for making bolts and nuts is

A.

hot piercing

B.

extrusion

C.

cold peening

D.

cold heading

Spot welding is used for welding

A.

lap joints in plates having 0.025 mm to 1.25 mm thickness

B.

lap joints in plates having thickness above 3 mm

C.

butt joints in plates having 0.025 mm to 1.25 mm thickness

D.

butt joints in plates having thickness above 3 mm

Thermit welding is often used in

A.

replacing broken gear teeth

B.

repairing broken shears

C.

joining rails, truck frames and locomotive frames etc.

D.

all of the above

The directional solidification in casting can be improved by using

A.

chills and chaplets

B.

chills and padding

C.

chaplets and padding

D.

chills, chaplets and padding

A sand employed on the faces of the pattern before moulding, is called

A.

green sand

B.

dry sand

C.

loam sand

D.

parting sand

In fore-hand welding, the angle between the welding rod and the work is kept as

A.

30-40

B.

40-50

C.

50-60

D.

60-70

The minimum size of a bloom is

A.

5 cm x 5 cm

B.

10 cm x 10 cm

C.

15 cm x 15 cm

D.

20 cm x 20 cm

The binder commonly used in making oil sand, is

A.

clay-type binder

B.

organic-type binder

C.

inorganic-type binder

D.

any one of these

The material which can be best cut with oxygen cutting process is

A.

mild steel

B.

brass

C.

copper

D.

aluminium

In spot welding, the distance between the nearest edge of the plate and centre of weld should be equal to

A.

d

B.

1.5d

C.

3d

D.

6d

Thermit, used in thermit welding, is a mixture of

A.

charcoal and iron oxide

B.

charcoal and aluminium

C.

iron oxide and aluminium

D.

charcoal, iron oxide and aluminium

The width of slot cut by a hacksaw blade is __________ the width of the blade.

A.

equal to

B.

less than

C.

greater than

A file with 20 teeth in 25 mm is called

A.

rough file

B.

bastard file

C.

second cut file

D.

smooth file

The flux commonly used in brazing is

A.

zinc chloride

B.

ammonium chloride

C.

rosin plus alcohol

D.

borax

The increase in hardness due to cold working, is called

A.

age-hardening

B.

work-hardening

C.

induction hardening

D.

flame hardening

In a __________ , the molten metal is poured and allowed to solidify while the mould is revolving.

A.

die casting method

B.

slush casting method

C.

permanent mould casting method

D.

centrifugal casting method

Riddle is used for

A.

smoothing and cleaning out depressions in the mould

B.

cleaning the moulding sand

C.

moistening the sand around the edge before removing pattern

D.

reinforcement of sand in the top part of moulding box

The oxygen cylinder is usually painted with

A.

black colour

B.

white colour

C.

maroon colour

D.

yellow colour

Which of the following welding method uses a pool of molten metal?

A.

Carbon arc welding

B.

Submerged arc welding

C.

TIG arc welding

D.

MIG arc welding

The advantage of thermit welding is that

A.

all parts of the weld section are molten at the same time

B.

weld cools almost uniformly

C.

results in a minimum problem with internal residual stresses

D.

all of the above

A gimlet is a __________ tool.

A.

boring

B.

marking

Slick is used for repairing and finishing the mould.

A.

Correct

B.

Incorrect

The maximum flame temperature occurs

A.

at the outer cone

B.

at the inner cone

C.

between the outer and inner cone

D.

at the torch tip

During cold working process

A.

grain structure is distorted

B.

strength and hardness of metal increases

C.

close dimensional tolerance can be maintained

D.

all of the above

Lap joints are employed on plates having thickness

A.

less than 3 mm

B.

5 to 10 mm

C.

12.5 mm

D.

above 25 mm

The recrystallisation temperature of steel is

A.

400 C

B.

600 C

C.

800 C

D.

none of these

A basic hole is one whose

A.

lower deviation is zero

B.

upper deviation is zero

C.

lower and upper deviations are zero

D.

none of these

Seam welding is best adopted for metal thickness ranging from

A.

0.025 to 3 mm

B.

3 to 5 mm

C.

5 to 8 mm

D.

8 to 10 mm

The surface to be machined is marked on the pattern by

A.

red colour

B.

yellow colour

C.

black colour

D.

blue colour

In electric resistance welding, pressure applied varies from

A.

1 to 5 MPa

B.

5 to 10 MPa

C.

10 to 25 MPa

D.

25 to 55 MPa

In order to deliver molten metal from pouring basin to gate, a __________ is used.

A.

riser

B.

sprue

C.

core

V-block is used to

A.

check the trueness of flat surfaces

B.

locate centres of round rods

C.

check the surface roughness

D.

none of these

A progressive limit gauge has

A.

'Go' and 'Not go' member on the same side of the gauge

B.

separate 'Go' and 'Not go' members

C.

'Go' member at one end and 'Not go' member at the other end

D.

none of the above

Piercing is an operation of cutting

A.

a cylindrical hole in a sheet of metal by the punch and the die

B.

a hole (other than cylindrical) in a sheet of metal by the punch and the die

C.

a flat sheet to the desired shape

D.

a number of holes evenly spaced in a regular pattern on a sheet of metal

Shift is a casting defect which

A.

results in a mismatching of the top and bottom parts of a casting

B.

results in general enlargement of a casting

C.

occurs near the ingates as rough lumps on the surface of a casting

D.

occurs as sand patches on the upper surface of a casting

During drawing operation, the states of stress in cup would include

A.

compressive stress in the flange

B.

tensile stress in the wall

C.

both (a) and (b)

D.

none of these

A diamond pointed chisel is used for cutting

A.

flat surfaces

B.

grooves

C.

keyways

D.

V-shaped grooves

The parts of circular cross-section which are symmetrical about the axis of rotation are made by

A.

hot forging

B.

hot spinning

C.

hot extrusion

D.

hot drawing

Scribing block is used to

A.

hold the round bars during marking

B.

check the trueness of flat surfaces

C.

locate the centres of round bars

D.

check the surface roughness

Acetylene gas is stored in cylinders in

A.

solid form

B.

gaseous form

C.

liquid form

D.

any one of these

Which one of the following material will require the largest size of riser for the same size of casting?

A.

Aluminium

B.

Cast iron

C.

Steel

D.

Copper

The consumable electrode is used in

A.

carbon arc welding

B.

submerged arc welding

C.

TIG arc welding

D.

MIG arc welding

The operation of cutting a sheet of metal in a straight line along the length, is known as

A.

plunging

B.

notching

C.

slitting

D.

forming

Linde welding uses

A.

neutral flame and right-ward technique

B.

oxidising flame and left-ward technique

C.

neutral flame and left-ward technique

D.

carburising flame and right-ward technique

The dowels are

A.

wooden nails

B.

box nails

C.

wire nails

D.

none of these

Extrusion

A.

is extensively used for making bolts and nuts

B.

is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work

C.

is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface

D.

consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

The process of decreasing the cross-section of a bar and increasing its length, is called

A.

drawing down

B.

upsetting

C.

spinning

D.

peening

A casting defect which occurs due to improper venting of sand is known as

A.

cold shuts

B.

blow holes

C.

shift

D.

swell

Swab is used for

A.

smoothing and cleaning out depressions in the mould

B.

cleaning the moulding sand

C.

moistening the sand around the edge before removing pattern

D.

reinforcement of sand in the top part of the moulding box

The metal patterns as compared to wooden patterns require less

A.

shrinkage allowance

B.

machining allowance

C.

draft allowance

D.

distortion allowance

When the dimension is expressed as, then the basic size is

A.

20 mm

B.

20.035 mm

C.

20.025 mm

D.

19.975 mm

In order to produce uniform packing of sand in the moulds, a __________ is used.

A.

sand slinger

B.

squeezing machine

C.

jolt machine

D.

stripper plate machine

Green sand is a mixture of

A.

30% sand and 70% clay

B.

50% sand and 50% clay

C.

70% sand and 30% clay

D.

90% sand and 10% clay

The surface to be left unmachined is marked on the pattern by

A.

red colour

B.

yellow colour

C.

black colour

D.

blue colour

The welding process used in joining mild steel shanks to high speed drills, is

A.

spot welding

B.

seam welding

C.

flash butt welding

D.

upset butt welding

The mode of deformation of the metal during spinning is

A.

bending

B.

stretching

C.

rolling and stretching

D.

bending and stretching

The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

A.

hot piercing

B.

extrusion

C.

cold peening

D.

cold heading

The process of increasing the cross-section of a bar at the expense of its length, is called

A.

drawing down

B.

upsetting

C.

spinning

D.

peening

In TIG arc welding, the welding zone is shielded by an atmosphere of

A.

helium gas

B.

argon gas

C.

either (a) or (b)

D.

none of these

The metal extrusion process is generally used for producing

A.

uniform solid sections

B.

uniform hollow sections

C.

uniform solid and hollow sections

D.

varying solid and hollow sections

The sand used for making cores is

A.

green sand

B.

dry sand

C.