MCQ type Objective Question Bank Name of the Trade : Welding Trade Code : WELD Choose the correct answer : 1 Which one is the temporary joint (a ) Forged Welding (b ) Cotter Joint (c ) Brazing (d ) soldering 2 Which is the non pressure welding (a ) Spot Welding (b ) Seam Welding (c ) Arc Welding (d ) Forge Welding 3 Oxi Acetylene Gas flame used in (a ) Gas Welding (b ) Gas Cutting (c ) MIG Welding (d ) (A) & (B) both
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
MCQ type Objective Question Bank
Name of the Trade : Welding
Trade Code : WELD
Choose the correct answer :
1 Which one is the temporary joint
(a) Forged Welding
(b) Cotter Joint
(c) Brazing
(d) soldering
2 Which is the non pressure welding
(a) Spot Welding
(b) Seam Welding
(c) Arc Welding
(d) Forge Welding
3 Oxi Acetylene Gas flame used in
(a) Gas Welding
(b) Gas Cutting
(c) MIG Welding
(d) (A) & (B) both
4 The colour code of Combustible Gas is
(a) Red
(b) Blue
(c) Black
(d) Green
5 The chemical formula of Acetylene is
(a) C4H4
(b) C2H2
(c) CO2
(d) C2O2
6 The Flame Temperature of Oxy – Acetylene Gas
(a) 1750° - 2000°C
(b) 2400° - 2700°C
(c) 3000° - 3300°C
(d) 3600° - 4000°C
7 Which one of the flame develops lowest temperature
(a) Oxy-Coal
(b) Oxy-Hydrogen
(c) Oxy-Acetylene
(d) Oxy-Propane-Butane
8 The term D.A. means
(a) Dissolve – Acetylene
(b) Dissipitate – Acetylene
(c) Delevered – Acetylene
(d) None of these.
9 The ratio of the oxygen is to Acetylene in the neutral flame is
(a)
2:1
(b)
1:2
(c) 1:1
(d)
3:1
10 The best flame is used to join mild steel sheet is
(a)
Carburising flame
(b)
Oxidising flame
(c) High Pressure Flame
(d)
Neutral Flame
11 The dissolve acetylene is called
(a)
Acetone
(b)
Oxytone
(c) Oxyacetone
(d)
None of these.
12 Making Butt Weld on Light Gauge Sheet Metal in flat position the torch tip should be held at about
(a)
30°
(b)
45°
(c) 60°
(d)
75°
13 Nozzle No. 1 is used to weld plate thickness
(a)
Less than 1mm
(b)
Greater than 1mm
(c) Greater than 10mm
(d)
None of these
14 The flame used to weld cost iron is
(a)
Neutral Flame
(b)
Oxidising Flame
(c) Carburising Flame
(d)
Laxness oxidising flame
15 Preheating is required to weld cast iron because it prevents
(a)
Oxidation
(b)
Nitridation
(c) Cracking due to expansion an contraction
(d)
None of these
16 Pre heating upto ___________temperature is required during Oxy-Acetylene cutting process
(a 200°C
)
(b)
300°C
(c) 600°C
(d)
900°C
17 To weld aluminium the flame is used
(a)
Neutral Flame
(b)
Oxidising Flame
(c) To increase in small amount of oxygen in neutral flame
(d)
To increase in small amount of Acetylene in Neutral Flame
18 The supporting gas for combustion is
(a)
Carbon dioxide
(b)
Nitrogen
(c) Oxygen
(d)
Acetylene
19 It is required to combust unit volume of Acetylene Oxygen is
(a)
1.5 times
(b)
2.5 times
(c) 3.5 times
(d)
4.5 times
20 Oxy Acetylene Cutting Nozzle is normally held at
(a)
30°
(b)
45°
(c) 60°
(d 90°
)
21 Which one is the no-fusion welding
(a)
Forged Welding
(b)
MIG Welding
(c) TIG Welding
(d)
MMAW Welding
22 The distance between electrode tip and base metal is called
(a)
Arc Length
(b)
Arc Gap
(c) Arc Distance
(d)
Arc Width
23 Reduction in molten metal occurs due to
(a)
Increase of current
(b)
Decrease of current
(c) Decrease of Arc Length
(d)
Slow welding
24 Capacity of a welding machine is denoted by
(a)
Input Amps
(b)
Output Amps
(c) Open Circuit Voltage
(d)
Close Circuit Voltage
25 Arc blow is caused for
(a)
Magnetic field
(b)
Radiation field
(c) Radio Active field
(d)
None of these
26 Arc below mostly found during welding in a
(a)
D.C. Machine
(b)
Bare Electrode
(c) A.C. Machine
(d)
Both (a) & (b)
27 The length of the electrode is found in
(a)
250mm and 350mm
(b)
350mm and 450mm
(c) 150mm and 250mm
(d)
400mm and 500mm
28 Welding machine used to weld non ferrous materials is
(a)
Welding Transforma
(b)
Motor Generator Set
(c) Welding Rectifier
(d)
Capacitor set
29 If the arc length increases the voltage
(a)
Increases
(b)
Decreases
(c) Same
(d)
May increase or decrease
30 For welding the following one is necessary
(a)
Low current high voltage
(b High current low voltage
)
(c) Low current low voltage
(d)
High current high voltage
31 Weld screen has transparent glass
(a)
To save eye
(b)
To save mouth
(c) To save colour glass
(d)
To save head
32 Weld screen has transparent glass
(a)
To save eye
(b)
To save mouth
(c) To save colour glass
(d)
To save head
33 Weld is a _________ joint
(a)
Permanent
(b)
Semi permanent
(c) Temporary
(d)
Semi temporary
34 Current required for welding in 8.5 S.W.G. is __________ amps
(a)
50-70
(b)
100-120
(c) 130-150
(d)
180-200
35 Diameter of electrode depends upon
(a Length of welding
)
(b)
Position of welding
(c) Volume of welding
(d)
Thickness of base metal
36 During overhead welding, the welder must wear
(a)
Welding goggles
(b)
Helmet
(c) Hand screen
(d)
sunglass
37 During welding the voltage remains in the machine is called
(a)
Open circuit voltage
(b)
Supply voltage
(c) Output voltage
(d)
Close circuit voltage
38 Maintenance cost of motor generator set over rectifier set is
(a)
Low
(b)
High
(c) Same
(d)
Very low
39 Welding may be done where current supply is not available
(a)
Motor generator set
(b)
Rectifier set
(c) Diesel generator set
(d)
Transformer set
40 The coolant used in the transformer is
(a)
Air or oil
(b)
Air or water
(c) Oil or water
(d)
None of these
41 The wire which connects the machine and holder is called
(a)
Welding cable
(b)
Welding wire
(c) Holder wire
(d)
Holder cable
42 When output current in the welding machine is higher then the voltage (output) is
(a)
Same
(b)
Low
(c) High
(d)
Not depends upon current
43 Termite welding is a ___________ welding
(a)
Fusion
(b)
Resistance
(c) Chemical
(d)
Plastic
44 The layer deposited after welding is called
(a)
Sleg
(b)
Chip
(c) Slag
(d Coating
)
45 Which one is not the function of flux
(a)
Controlling current
(b)
Preventing oxidation
(c) Stabilising arc
(d)
Remove dirt, dust and oiliness
46 During lightening in a gas burner first we have to open
(a)
Acetylene regulator in burner
(b)
Oxygen regulator in burner
(c) Both oxygen and acetylene regulator or cylinder
(d)
Both oxygen and acetylene regulator of burner
47 Slag from welding portion is removed by
(a)
Chipping hammer
(b)
Claw hammer
(c) Straight peen hammer
(d)
Mallet
48 Transforma ARC welding machine may be connected with
(a)
110 volt supply
(b)
220 volt supply
(c) 440 volt supply
(d)
Both 220 and 440 volt supply
49 During welding job should be placed in material that must be a conductor due to maintaining
(a)
Continuity
(b)
Absorb of heat
(c) Prevent of absorbing moisture
(d)
None of these
50 The regulator in the welding machine regulates
(a)
Input current
(b)
Out put current
(c) Output voltage
(d)
Input voltage
51 Nozzle runner in gas welding is detained by
(a)
Plate thickness
(b)
Gas consumption
(c) Gas pressure
(d)
Size of filler material
52 Filler rod of gas welding
(a)
Bare
(b)
Flux coated
(c) Bare but enamelled
(d)
Flux coated and enamelled
53 The distance between electrode and base metal must be within
(a)
4-6mm
(b)
3-4mm
(c) 2-3mm
(d)
1-2mm
54 Long arc length is the cause of
(a)
Lack of fusion
(b Under cut
)
(c) Crack
(d)
Spatter
55 Welding transformer is a
(a)
Step down
(b)
Step up
(c) Self induced
(d)
Slipping transformer
56 Edge preparation must be done during welding because it requires
(a)
Groove
(b)
Cleaning
(c) Shape
(d)
Size
57 Tag welding is required to prevent
(a)
Spatter
(b)
Crack
(c) Distortion
(d)
Under cut
58 The most easiest welding can be done
(a)
When the job is in overhead position
(b)
Flat position
(c) Vertical position
(d)
Horizontal position
59 Code diameter of an electrode is
(a Diameter of cable including insulation
)
(b)
Diameter of electrode excluding flux
(c) Diameter of electrode including flux
(d)
Diameter of electrode including cable diameter
60 The angle between base metal and electrode should be _____________ during lap joint
(a)
60° - 75°
(b)
50° - 60°
(c) 40° - 50°
(d)
30° - 40°
61 In spot welding the voltage is recommended between the range
(a)
40 – 60
(b)
20 – 30
(c) 10 – 20
(d)
2 – 4 volt
62 In spot welding machine pressure is applied by
(a)
Hand lever
(b)
Foot lever
(c) Motor
(d)
Hydraulic and foot lever both
63 In spot welding machine a timer is required to
(a)
Show current timing
(b)
Show voltage timing
(c) Current cut off
(d)
Voltage cut off
64 Welding cable is made of _____________ wire
(a)
Copper
(b)
Aluminium
(c) Steel
(d)
Brass
65 The specification of a welding cable is denoted by
(a)
Diameter
(b)
Current carrying capacity
(c) Voltage carrying capacity
(d)
None of these.
66 When electrode cannot be withdrawn the welding will stop. This is known as
(a)
Arc peening
(b)
Arc freezing
(c) Arc shielding
(d)
None of these
67 The weight of the electrode holder should be not more than
(a)
200gms
(b)
300gms
(c) 400gms
(d)
600gms
68 Hand screens weigh should be limited with
(a)
200gms
(b)
300gms
(c) 400gms
(d)
600gms
69 Pre heating upto _________ °C is required for gas cutting
(a)
240
(b)
300
(c) 500
(d)
900
70 In MMAW Process the arc temperature is
(a)
1700-1800°C
(b)
3000-3600°C
(c) 3600-4000°C
(d)
2500-2700°C
71 Brazing is also known as
(a)
Hard Soldering
(b)
Hard Joining
(c) Medium Soldering
(d)
Brass joining
72 Solder materials is alloy of
(a)
Copper and zinc
(b)
Copper and tin
(c) Lead and tin
(d)
Copper and lead
73 Dry Chamber System is the type of welding system performs in
(a)
Furnace
(b)
Under water
(c) Boiler
(d)
Gas chamber
74 Oxygen in the oxygen cylinder is kept under pressure of
(a)
60 kgf/cm2
(b)
110 kgf/cm2
(c) 140.6 kgf/cm2
(d)
200 kgf/cm2
75 Oxygen cylinder are made of
(a)
Cast steel
(b)
Seamless drawn steel
(c) Mild steel
(d)
Manganese steel
76 The heat is produced by an arc between a continuously fed electrode is called
(a)
MMAW
(b)
SMAW
(c) Submerged
(d)
MAG
77 Carbon dioxide gas is
(a)
Inert gas
(b)
Active gas
(c) Non consumable gas
(d)
Non active gas
78 Gases of plasma arc is
(a)
Hydrogen
(b Argon
)
(c) Carbon dioxide
(d)
Argon with 5% - 15% hydrogen
79 Forged welding is done in
(a)
Machine shop
(b)
Fitting shop
(c) Smithy shop
(d)
Welding shop
80 Welding temperature for iron and steel in forged welding should reach
(a)
1500°C
(b)
1100°C
(c) 1000°C
(d)
900°C
81 Forged welding requires a striking tools that is
(a)
Ball peen hammer
(b)
Straight peen hammer
(c) Sledge hammer
(d)
Claw hammer
82 Resine used as a flux in
(a)
Soldering
(b)
Brazing
(c) Welding
(d)
None to these
83 Which one of the joint is not a permanent joint?
(a Riverting
)
(b)
Flange joint
(c) Brazing
(d)
Soldering
84 Which one of the joint is not a temperature joint?
(a)
Coupling
(b)
Stud joint
(c) Forged welding
(d)
Key joint
85 The unit of power is
(a)
Joule
(b)
Volt ampere
(c) Joule / See
(d)
Newton
86 The e.m.t. develops in a transforma
(a)
Primary circuit
(b)
Secondary circuit
(c) Rectitier circuit
(d)
None of these
87 The secondary circuit is linked with the primary circuit
(a)
Magnetically
(b)
Electrically
(c) No link
(d)
Scott connection
88 The e.m.t. depends upon
(a)
Rate of flux cutting
(b)
Number of turns in secondary circuit
(c) Number of turns in primary circuit
(d)
(a) & (b) both
89 The connection required in a transforma (440 volt) by
(a)
Single pole main switch
(b)
Double pole main switch
(c) Triple pole main switch
(d)
Any one of these.
90 The 440v transforma should be connected with a ____________ amps main switch
(a)
15
(b)
30
(c) 65
(d)
100
91 LASER beam weld has a limitation to weld upto plate thickness
(a)
15mm
(b)
10mm
(c) 5mm
(d)
3mm
92 Antogenous welding involves with
(a)
Similar metal
(b)
Dissimilar metal
(c) Alloys
(d All of these
)
93 When electrode touches in the job then current flows about _______% of heat develops in positive pole
(a)
40%
(b)
50%
(c) 60%
(d)
67%
94 Reverse polarity is used when
(a)
Job thickness is more
(b)
Job thickness is less
(c) Electrode thickness is more
(d)
Electrode thickness is less
95 Under cut develops due to
(a)
Poor penetration
(b)
Low current
(c) High current
(d)
High voltage
96 Peening is required to
(a)
Strain relieved
(b)
Stress relieved
(c) Nodular formation of molten metal
(d)
None of these
97 Peening is done by
(a) Hammer
(b) Clipping hammer
(c) Holder
(d) Electrode
98 Due to high temperature metal expends and the defect occurs is called
(a) Under cut
(b) Distortion
(c) Porosities
(d) Spatter
99 Hand screen protects
(a) Ultra violet rays
(b) Heat
(c) Spatter
(d) All of these
100 In TIG welding the electrode is
(a) Non consumable
(b) Consumable
(c) Both (a) & (b)
(d) It has no electrode
101 The gas used in TIG welding is
(a) Acetylene
(b) Oxygen
(c) Argon
(d) Carbon dioxide
102 The gas used in MAG welding is
(a) Acetylene
(b) Oxygen
(c) Argon
(d) Carbon dioxide
103 To weld 6mm thickness mild plate the required electrode size is