2008-2012 papers mechanical engg kuk university

Roll No. Total No. of Pages : 2

BT-4/M11 8452Material Science (w.e.f. 2006 onwards)

Paper: ME-204E

Time : Three Hours] tMaximum Marks : 100

Note:-(1) Attempt anyfive questions selecting.at least

ane question from each unit.

(2) All questions carry equal marks.

I.INIT-Il. (a) Find out Packing Fraction and Coordination

following:. (i) Primitive unit cell structure.

(ii) BCC structure.

(iii) FCC structure.

(b) Write down a short note on Crystallography.

(c) Copper has FCC structure and an atomic radius ofCalculate its density.

Atomic wt. of Cu:63.5 g/mol

Avogadro number = 6 x 1023.

2. Explain the following with neat diagrams :

(q) Point and Line defects.

(b) Edge and Screw dislocations.

(c) Slip and Slip planes.

6

7

7

I]NIT-II3. (a) Explain the TTT curve with its main applibations 8

(b) Derive the phase rule F=C-P+2, symbols having their usualmeaning. 6

(c) Differentiate between Eutectic and Eutectoid Systems with same

number for

6

6

r.278 A.

6

(Contd.)

examples.

8452

,-_/

l

4. (a) What is meant by Heat Treatment ? Also mentionobjectives.

(b) Explain the following terms in brief :-(i) Annealing(iD Tempering

(iii) Hardening

(iv) Cyaniding.

UNIT-III(a) Explain the mechanism of Fatigue. Also discuss the factors

affecting the fatigue. n(b) Differentiate clearly between Brittle and Ductile Fracture with

the help of suitable examples. g

(a) Explain Bauschinger effect in detail with same examples. 10

(b) what is the process of plastic deformation ? Also discuss the

its main

8

t2

5.

6.

7.

8.

deformation by Twining effect,

[]NIT-IV(a) Discuss dry and wet corrosion.

of corrosion prevention.

(b) What are Cerainics ? Explain in brief. Also discussproperties and forming techniques.

(a) Draw a typical creep curve and also label its important:rreas. g

O) What are main objectives of Creep Test ? How it is carriedout? 6

(c) Discuss the effect of time, temperature and metallurgical

10

Also explain various methods

l0their

t0

6100

- BT-4/JXMaterial Science (w'e'f' 2006 awards)

PaPer: ME-204E

8334

Time : Three Hours] [MaximumMarks: 100

Note :- Attempt FTVE questions' selecting at least ONE from each Unit'

UNIT_I

1. (a) Explain Space lattice and Crystal plane' i0

O) Explain simple tetragonal and simple orthorhombic structures'

10

2. (a) What is crystal imperfection ? Explain different types of crystal

10imPerfections 10

O) Explain surface defects and volume defects'

UNIT-II

3. (a) What is a solid solution ? Explain'

O) Explain tfie importance of phase diagpm'

4. Explain Pb-Sn Phase diagram'

5. (a)

(b)

6. (a)

(b)

8334

10

10

20

UNIT_III.. ar ----^a:^- 10

Explain elastic and plastic deformation'

Explain conventional and true stress-strain curve for

polycrystallinematerial' 10

What is fracture ? Explain prooess of fracture' 10

Explain fatigue and its characteristics' 10

Contd.

UNIT-IV..:\ \Define creep What is Si.1esented

b

Explain creep fracture.':"

Explain different types of polymers.

Write a note on ceramic materials:

(a)

o)(a)

(b)

7.

8.

;creep curve ? t0

10

l0

10

\A.--

\(* 4ffi

Roll ofa5

BT-5/D07

DYNAMICS OF MACHINES

Paper - ME-301

opt. - (i)Time : Three Hoursl

Note : AttemPt anY five questions'

marks.

[Maximum Marks : 75

A11 questions carrY. equal

1. The connecting rod of a vertical reciprocating engine is 2 m

long between centres and it weighs 250 kg"The mass centre

is 800 mm from the big end bearing. when suspended as

a pendulum through gudgeon pin axis' it makes 8 complete

oscillations in 221econds. calculare the radius of gyration

"iin" rod about an axis through its mass centre' The crank

is 400 n.rm long and rotates at 2b0 r'p'm' When the crank

has turned ti,,o-ugt' 40o from the top dead centre and the

'piston is movingl downwards' analytically find the inertia15

torque exerted on the crank shaft'

2. (a) Distinguish between Brakes and Dynamometers' 3

(b) What are the ieading and trailing shoes of an internal

exPanding shoe brake 3

(c) Explain with neat sketches the Bevis-Gibson torsion

dYnamometer' 9

lP.T.O.8936/1 001KD12298

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Roll No" Total No. of Pages : 3

8802BT-51J05Dynamics of Lfiachines

Paper : ME-301

Time: Three Flours] [Maximum Marks : 75

Note : Attempt any five questions. All questions carry equal marks.

l. For the static equilibrium of the quick-return mechanisrn shown infigure, determine the input torque T, to be applied on link AB for aforce of 300 N on the slider D. The dimensions of the various linksare OA:400 mm, AB = 200 rnm, OC:800 mm, CD = 300 mm.

@L300 N

400*oo

Fig.l IJ

The turning moment dlagram of a four-stroke engine is assumed to berepresented b,v four triangles. the areas of which from the line of zeropressure are

Suction stroke:440 mmr

Compression stroke = 1600 mm2

Expansion stroke = 7200 mm2

Exhaust stroke = 560 mmr

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ME-301 : DYnamics of Machines

Time : Three Hours]

Total Pages : 4

8118-S

[Maximum Marks : 75

Note :

1. (a)

Attempt any five questions.

The weight of reciprocating parts of a horizontal

engine is 250 kg. The difference between driving and

back pressures. when crank has traveiled 60" from

IDC is 3'5 kg/cmz

The crank pin circle radius is 30 cm and diameter of

cylinder is 50 cm. The connecting rod length

between centres is 120 cm. Take the speed of the

engine as 250 rPrn

For the given position of crank, neglecting difference

of area on two sides of the piston, estimate :

(i) Force on slide bars

(ii) Thrust in the connecting rod

(iii) Tengential force on the crank pin and turning

moment. 10

(b) A conn€oting rod of an engine is 225 mm long

betweenitscentres.Themassofthe.connectingrod

is 1'2 kg. The distance of the centre of gravity from

the small end is 150 mm and radius of gyration about

an axis through the centre of gravity is 95 mm' Find

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1 m and the diameter'of shaft from engine flYrtvheel to the

gear is 8 cm and the length of shaft from pinion to

impeller is 40 cm and the diameter of shaft from pinion

to impeller 6 cm' The ratio of engine and pump seeds is

onethird. Thke moments of Inertia of engine flyrheel'

,"", *u*1, pinion and pump impeller ut:-.10o'.t'' t'

ZO ur-# respectively' The modulus of rigidity of shaft

material is 0'8x tO6 udl*'

Find the fundamental and two node frequencies of the

free torsional oscillation'

7. A machine of mass 10 kg is supported on springs and

dashpots. The total stiffness of springs is 5 N/mm..and

total damplng is 0'075 N/mm/s' The system is initially at

rest and u '"lotity of 100 msls is imparted to the mass'

Determine :

(i) the displacement and velocity of mass as a functiott

of time and

(ii) the displacement and velocity after one.second' 15

8. Write short notes og any three of the followrng : 15

1j' rr*.fer functions in automatic control system

(ii) Sensitiveness' stability and hunting of a governor

(iii) GYroscoPic stabilization

(iv) Balancing Machines

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Roll No' 'i""""""""""'

BT'3/D09

i

Paper : Math-201(E)

lMaximum Marks : 100

Time : Three Hoursl

Note : Attempt/ive questions t" ill selecting at least one question

f'o* "utt' unit' A11 questions carry equal marks-

TiNIT.I

1. (a) Find a Fourier series to represent x-* from x = -'[

to x -- Tt'

(b) ;;fl; = po"l' expandflx) as a Fourier sedes in the .

..' 2,. (u) : Find the Fourier transf6rm of

I t for lrl< 1I r ^-- I I

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d .

c SlIt'X- I

-

Ct'Hence evaluate I ,o tor Fourier(b) State and f'ou" Convolution theorem

transforms'

Fisecc[' Prove that, 3. (a) If tan(O + iQ) = tancr -

'a cr -rd 2o =(n+1.\"*"'"tQ-!9911.Zt

t ,t- ,t I Lt- \ '/

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MATHEMATICS-ruPaper: Math_20IE

Time : llrree.Floursl [Maximum Marks : 100

Note : Atternptfve questions in ar, serecting at leasr ore questionn each Unit. AII guestions cany equal marks.

UNIT_II. (a) Obtain the Fourier series for rhe funcrion

-f(;u) = r-r, 0 <x < I andl(x) = n(2 _r), I < x < Z.(b) Find the half_range cosine serjes for l(g = I in therange0(r(n.2. (a) Find the O:o.i:. rransform of f(x)_ I _ f ,t l.r l < Iandl(;r) = 0 if l, | , I, and hence evaluare

f-rgosr-sinr ,r-Jo --*l-- cos a dr.

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(iii) "r-, ol={}, o=i='i

UNII_II3. (a) trf cos (0 + ip1= cos dr+ i sin a, prove that(i) sin20=+sina

(ii) cos 20 + cosh ZQ = Z"

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Roll No.

BT-4/tvr09Material Science

Paper: ME-204E

Tirne: Three Hours]

Note:- Attempt any f,'IVE questions with

section.

Total No. of Pages : 2

9341

[MaximumMarks: 100

at least ONE from each

l5

t2

UNIT_I

1 . (a) How do the crystal imperfections alter the strength of materials ?

How these imperfections are introJuced in the crystal ? 15

(b) Find the atomic packing number for a HCP structure. 5

2. (a) Explain the difference between isotropy and homogeneity of a

crystal. Give examples. 5

(b) Explain how the plastic deformation changes the isotropic and

homogenous structure of material to non-homogenous and

non-isotropic one.

UNIT_II

What are TTT diagram ? How are they prepared ?3. (a)

(b) Compare in a tabular manner the impact strength, ductility,

elasticity hardness of austenite, ferrite, pearlite and martensite.

8

4. (a) What are peritectic and peritectoid reactions ? Explain phase

diagrams containing these reactions. 8

(b) A gear undergoing shock loading requires hard surface to

withstand wear and a soft core to rvithstand shocks. Suggest

and explain the heat treatment processes for this object. 12 ,

%41 Co.

5.

UNIT_III

(a) Why are plastic deformations non recoverable ? Explain how

does plastic deformation increase the strength or-ut"ttur.

,,(b) What is the requirement of true stress strain cures ? Obtain its

relationship with conventional stress and strain. 8

(a) Draw stress strain for two materials-one brittle and another

ductile, both with equal fracture strength under impact loading.

Explain the curves. 8

(b) Explain the concept and differences between recovery,

re-crystallization and grain growth. t2

NIT-fv

(a) What are ceramic materials ? What are their properties, forming

techniques and mechanical behaviour ? 10

(b) Explain creep, its mechanism and its behaviour with respect to

time and temperature. 10

(a) Explain the strengthening mechanism of composites. 10

(b) What are composites ? How are theyprepared ? What are their

advantages ? 10

6.

7.

8.

3600

tioU

sa.lo\

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Rt:ll No. Total No. of Pages : 2

BT-4/JXProduction Technolory - II (w'e'f' 2006 onwards)

8333

Paper: ME-202E

Time : Three Hours] fMaximumMarks: 100

Note:-AttemptanyFIVEquestions,selectingatleastONEfromeachUnit.

UNIT-I

1. Describe mechanical and hydraulic drives with suitable sketches with

reference to machine tools. Also, give principle of stepped regulation'

20

2. flow are spindle speeds arranged in the head stocks of various

machinetools?WhyG.P.ispreferredtootherlayoutsforgearbox20

design ?

UNIT_II

3.Whatareimportantcharacteristicsofturretlathesinrelationtoengine lathes ? Explain turret indexing mechanism with the help of

a heat diagram. 20

4. What is meant by the term gear generation ? Describe gear hobbing

processindetailandstateitsadvantages,limitationsandindustrial

applications

UNIT-III

Describe the principle of working of Ultrasonic machining with the

help of a suitable sketch. Also, discuss the effects of process

parameters on lnetal removal rate in VSM' 20

Give a detailed classification of presses used in press working' H:*

are cutting forces encountered in press working affected by varying

clearance ? 20

5.

6.

)) Ccntd.

Total No. of Pages : 2

BT-44\{09ProductionTechnolory

Paper : ME-202 E

OPtion: II

9340

Time: ThreeHours] [MaximumMarks: 100

\ote :- There are FOUR sections A, B, C and D' Attempt any five

questions selecting at least ONE question from each section'

A11 questions carry equal marks' Assume suitable data if not

given.

SECTION_A

1-. -(a) Describe the process of selection of extreme vaiues of spindle

sPeed on lathe' 8

t (O) Describe the process of obtaining rotary motion by means of

hydraulic drives. 12

.(a)ExplaintheprocessofobtainingsteplessregulationofspeedbyMechanical means' 10

(b) In a gear box, spindie speed values are affanged in Geometric

progression. Explain with suitable example' 10

SECTION-B

3.(a)Explaintheturretindexingmechanismwithneatsketch.l0(b)Prepareatoollayoutofturretlatheforacircularheadboltof

thedimensionshowninfigure.Thestandardbarstockof35mm10

ffi so _-->{

Contd.

-ff-- -: _

4.

5.

Explain the various methods of gear generation and gear finishing

alongwiththeir aPPlications' 2A

SECTION_C

(a) Explain the mechanism of metal removal in Laser Beam

machining. Also discuss the effects ofvarious process parameters

on metal removal. Also state the advantages' limitations and

applications of Laser Beam machining' t5

(b) Does electrode-electro$e eombination effect the ECM process ?

Justify your answer with a suitable exampie' 5

(a) Briefly describe the classification ofpresses' 10

(b) Explain the variation of cutting force in punching/blanking

operation with a neat sketch' 5

(c) Compare and contrast progressive die with compound die' 5

SECTION_D

7 . (a) Descrio-e the working of three component turning dynamometet

Also explain its calibration method' 12

(b) List the various sources of vibration in machine tools' Also

discuss the effects of vibration on machine tools' 8

8. Describe the following basic methods of measuring forces :-

(1) by axiallY loading member

(ii) by cantiiever beam

(iii) by rings.

6.

20

93403$N

Roll No. Total No. of Pages : 2

1 BT-4/UI11

Paper : ME-2A2E (w.e.f. 2006 onwards)

84sl

Time: ThreeHours] [Maximum Marks : 100

Note :- (1) tffi:TJiff$:':"J"i"#i

serectine at

(2) All questions carry equal marks.

T]NIT-Il. (a) Differentiate between stepped and stepless drives used in

machine tools. 8

(b) How will you select extreme values of spindle speed on alathe ? 12

2. What are the kinematic advantages of G.P. for gear boxdesign ? Comment on the selection of common ratio for designing

the gearbox.UNTT-TI

3. (a) What are the salient features of turret lathes in comparison to

ordinary lathes ? 6

(b) What is gear generation ? Describe in detail the gear hobbingprocess. L4

4. (a) Write a brief note on tooling equipment for turrets. 6

(b) What is the need for gear finishing ? Describe gear dhaving and

gear burnishing methods.

UNIT-III5. What is the principle of metal removal in Ultrasonic machining ?

List various process parameters affecting the performance ofUltrasonic machining and discuss their effects on material removal

8451

20

(Contd.)

20

t4

6.

7.

(a) Briefly describe laser Beam Machining process. 10(b) Give a detailed ctassificatio, "r;;;, ;;;r"r, *".*.1 itools and point out some salient features ,f ;"; ;;;? Upresses.'

l0UNM_ry

(a) lj,r::T*: effects of vibration on machine tools, work pieceano cutt,rrg tools.

10(b) what is theneed formeasuringcufting forces ? Enumerate somebasic requirements ofmeasuring teciriquer. - - --lO

Write notes on ttre following :_(a) Sources of Vibration.(b) 3-DimensionalTurningDynamemslsL

8

t2

845 I6100

,'<-

&ll No. Total No. of Pages : 3

; BG4/JX 8394Mathematics-IIIPaPer: Math-201-E

Time: Three Hours] [Maximum Marks: 100

Note:--- Attempt any FfVE questions, selecting ONE l

question from each section.

SECfiON-I

l. (a) Draw the graPh of the function

f(x)=0' --lu<x<0' =x2, 0<x<rt'

lf f(Zrc.'x): f(x), obtain the Fourier series of f(x)' l0

(b) Find the half range cosine series for

f(x):kx' 0 3x3ll2= k(/- x'5, ll2S x S L

Hence find the sum of the series

lll*+ . +i+......too. l0l" 3' 5'

I

2. {a) Find the Fourier cosine transform of f(x) =;7' 10

"^) fu 0'u(b) Using suitable Fouriertransform solve.the equation e= A*r'

(x > 0" t > 0) subject to conditions :

(i) u: 0 when x = 0, t> 0.

It, ocx<l(ii) u=10, x)1.(iii) u(x, t) is bounded.

I

l0(Contd.)8394

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