T6-Paper / Subject Code:

N*ch lsu-- frTotal Marks: 80

Q1

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Explain surface roughness symbolsExplain concept of flatness withDifferentiate between precisionWrite short note on-Planning

Explain Taylors PrincipleExplain construction

Explain following1) R" Value2) R,Value3) Rv Value

'4) RMS value .

maintain compromise

of 3D cr:ordinate rneasuring machinecapable process".your agreement or disagreement in detail.

's tester used in gear measurement.sampling plans in detail

rI

Tg ///?em VT f u".rl. I cbug / g€0c'{4., L^o{F P-,,IP z.{,,lznrtPaper/ Subject Code: 375021MACHINE DESIGN - I

Q"P. 25532

Time:3 Hours Marks:80

r Questit:n No. i is cornpulsoryo Attempt any three questions from the remai-ning.r Assumption rnade should be clearly statecl.

. Use of standard Design Data Book by PSG, Mahadevan is pennitted.

2$Ansrver any four of the following

'F,rgonomic is cornprornise in order to achieve performance anC aesthetic'

explain thrs statement with example,

Explain mechanrsnr of fatigue failure rn ductile rirrd brittle material.

Explain ,rverhauling of screw and self.locking of screw"

What is surge in spring? Horv rt can be eliminated.

What is rhe necessity of theories of lailures? Name rJift'erent theones ot'tailures.

Why the cotter in the Cotter joint is kept as wcakest part. explain. 4

A knuckie joint is to be design lo connect two Mild Steel bars under a tcnsile

loacl of 150 KN. The allowable stresses are 75Mpa in tension, 50h'{pa in sirear

and 150 Mpa in crushing. (Assume empirical relations as Diameter of knucklcr

pin dr:-d, Outer diameter of eye dz:2d, diameter of knuckle pin head anci

collar d3 :1.5d, thickness of single eye t = 1.25d, thickness of fork tr : 0.75d,

thickness of pin head t: = 0.5d)

'God,e:

Q.1

(a)

(b)

(c)

(d)

(e)

Q.2 (a)

(b)

1. Drar,v neat sketch of knuckle joint.

2. Find the cliameter of the rod (d).

3. Using empirical flnd all dimensions.

4. With neat sketches for failure cross section aroas check all

under different failures.

Page 1 of 3

l 6858EF25 1 89899 I i 3CE47ECAC3444|7

J

)

3

components I

lPl-ol

Paper I Subjeet Code: 315A2/ MACHINE DESIGN - I

Q.3 (a)

Q.P. Code: 25532

Show the variation of the tangenrial stress and radial stress across the cylincler' 5

thickness and derive the Lames equation for the thickness of thick cytrinder

subjected to an intemal pressurc only'

A horizontal shalt transmittilg 20KW ar 120 rpm rs supported at the bearing at 15

A at the letl end and B at the right end which are 2400mm apart" Gear c and

gear D located at a distance of 250mm end 400mm fiom tlre centre line of le ft

and right bearing respectiveiy' The PCD of gear C and D are 600mm and

200mm. The tangential fo,ce of the.gear C antl D are act vertically dorvnward,

The weight of gear c and D are 950N and 350N lespectively Tlie combineci

shock ancl f-atigue factors for.bending ancl torsion ur: ':l3d

1"2 respectivel-v'

Find the iiiameter of the shaft if the desiglr stress is 100MPa in tensron an<J

60MPa in shear" Take F': Ft tan (2oo)

a trush pinrtype flexible coupling fo connect an electric motor with the 12

shaft of centrifugal pump. The motor delivers a power of 20Kw at 960 ryni'

The diameter of the motor and pump shaft 40mr:r. Allowable bearing pressure

in the rubber bush ii 0.45 Nlmm2. select srandard key and check it for shear

and crttshing faihire'

(b)

an operating load range of 600N to 1200N' 08rh) Desisn a Helical valve spring for

1 load is ?5mm' l ake the spring index 6 andThe comPression at the maxlmufi

' 'il - -ndurance, shear stress for the spring material as 480Mpa and yielclpermlssl0le el

sffess in shear is'960MPa ana C: 80KNimm2'

lProl

Page 2 of 3

i 5858EF25 I 89899 I I 3CE4?ECAC3444t1

\

Paper / Subiect Code: 37502 / MACHINE DESIGN - I

elemcnts 10

L Notch sensitivitY2. Endurance limrt3. Surface finish factor4. Size factor5. Stress concentration factor

OKN tensile to 300KN compressive varying l0

rd the diameter of the rod usrng sotlerberg critena and assuming

following data. Endurance limit = 280Mpa, tensile yiel<i strength =350Mpa'

factorofsafety:2,correctionfactorforloarling=0'7'surfacefactor:0'8'size

factor : 0.85' stress conccntration factor : l '

10

L0

Q.P, € e:'25532

Q.5 (a) Explain the tbllowtng terms related to the design of

subjected to the variable loads'

Figure: i

Page 3 of 3

1 685EEIr25 I 89899 I I 3CE4?ECAC3444 I 1

Q.6 (a) Select suitable sta:rdard hook for the lifting lsad of I i ()KN of trapezoidal cross

and fincl the stress indriced at the most critical cross section of the hook'

(b) A bracket is supporled by tour rivet of equ'al rliameter as shown in figure i rs

usetoSupporta.loadofl2Kl.{.f)etermirletltesizeoftherivettakingthe

permissible"shear stress as 60MPa'

l;;:' ""

- ";

l1'

D--^- / C.-I-:^^1 /-1^J^. rqEr|a /]t,[[tr^trr l r'Tr/r l r f /lDn I tPaper / Subject Code: 37503 / MECHANICAL VIBRATIONS . . , .,2rf,Lrrviiu -Olltlzot'ae 8e/Dv-/n""h/cnc"s/ srr2-at& , -

{ t (3 HoursJ .;::: -:,..'ilo'tatMarks: B'0

i,,,i:' '' .,

.i..,,',,. '-t-:,'..:','.1'!'..'lr,' . " ,," :"': ,

Instructions: :. 'i ,. ' til;.: L r ,.1,,: ':'r:i ' ,r ''

' '

i'Attempt any four of the following sub questionsili'r,Q1.

a.

b.

C,

d,

e.

Exptain Dunkerley's method una nrg"igh'r pf€thdd,

transverse vibration of shaft carrying numbe*{f,boffi}

(201

tsl

(s)

(sl

Explain with suitable example howcatastrophic failures.Show that the inertia effect of aby transferring 1/3.d of its massWhat are the steps involved inThe block of 10kg resting on anof 10KN/m as shown in rigugdffif*E

(5)

is)

horizontal is 25 degrees. rnehi.$#i"'fll$trthe amplitude decreases H*Sem"tftl" rubetween the block and su#dr#ai::;, ,i ,s..::"_

0.2 N-s/mm.The system is initially atmass. Determine:

fi'*s;,.ena equivalent inertia for the system shown in (s)

Figure.2

1

8OcA8E82988894'49483F347888D8833C

after 0.5 sec

spnngto the

that

applied to the mass find the steady state

barof mass nt

Particle ofI rnas* 2rr

k

+; i*.. , i'

and dashpot. The total stiffness of

Q3.a Derive the equations of rnotion using Lagrange,s methodFigure 3 below.

Figure 3

Q3.b A vertical steel shaft tSm.didisc of mass L5kg at its c.eh,tieelasticity of the disc

Slfiderbarsfm$: a ard lcrgt! I

mass of the shaft and,range of the speed plt$

Q3.c Expiain tt "

tu.*sti.EEmrif':+." -# $';1"":r

:-+,ii {--i;i;oi-,''&*U-pSrBed end are the loading on a

i8)

{4)

(1s)

(.:

[10]

Q4.a

Zmm. What would be theat 80cm from fixed end? The

ven by

part of the unbalance force in reciprocating force is balariced?a t,dr L ur Luc uuualance rorce ln reclprocating torce is balafced by:ive resultant unbalance primary force if cyo balancing is achieved.

"-4fuigmponent of mass 2,5kg vibrates in a viscous medium. Determine the[cg-gfficient when the dynamic excitation force of 25N results in a resonant

a viscous medium. Determine the; ,; ,,u"*4-P,l$$.coefticient when the dynamic excitation force of 25N results in a resonant. l, -.,,*|S,ff-l-?!iT,X,*h a period.of

,0.1t-u-.. if excitation frequency is BHz and if damper

what will be the amplitude of forced vibration

2

B0CA8E8298E89A49483F347888D883 3C

[10)

(6)

(6)

Paper / Subject Code: 37503 / MECHANICAL YIBRA

20N at 3cantilevernatural

/ i1i "l'

.;r 1'r1, : l

U,,:F.1) ,r:

:. ir:-- ,:;:: i1

carrres a

modulus oflpa. Neglect thefind the unsafe

and mass m floats vertically in a liquiden vertically to the mass in downward

Q4.b

of oscillations of the mass.

strokes 125mm, The connecting rods driving aThe mass of the reciprocating parts per cylinder

shaft is 2400 rpm. Determine the maximum andsecondary forces.

, having undamped natural frequency of 100H2 and aused as an accelerometer to measure the vibration of a

red of3000 rpm. tf the actual acceleration is 1-0m/s2 and the9m/sz, Determine the mass and spring constant of the

Q6,c

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. . :" -:: ,., rr. ^\ l_.^.;.+ p/e \"-r +," iu:r. -lI .\.,.1 ,.. ". .;:..".. ;",.*:..- * .i..,, *: i..l."Jq.r_a _: l.r; .i*,.':'':1i'" . ........i. -.:" :: ..t J:;'i.->"' J,t,,)..''

",.1 L,. r.1i';i1.1". 1.i.;;i''.*'i1''.:.1'+r.,{l .":r'"";. .",:...r-i""''. "

.;*.'.1. .;l ';It:' .,,' a,i.; . r*.^.,;r r:...i,+."5-"':,.'r --, :r, :.1.,

ti.1:.*],,,a:";+it.r._,j.'-.. .i : "*r: .-r. ,..",:, .:'"" :' ,"1: .i.''. ,1:..,;:,.-* '-'.i; r ' i*' ;li,'n^ , .f::.--i ..:'; j.. -; .:;: .S: + i. 'i' q i"..:-*1,,""t.$".*-:t-#.ii,';,;..,i.'.:,,:i..,: i. *i" ;"i i:i'";,' ;t ^' -,

i.' _*. ^l'

.\' *\. - :F +.i ^ " -:," '.' -t -'r . "l :'" .y ,.:, --:-..-';-:l-,ri';f;)..ou.5-*l_{;:r,.,..,}',,,11...::,: r.l ;'i.'".,1.:");",:

.:: -* ^/\,

.4. L\: ._v 4iF -1., * : ..__ _:' ." . .1 .,1 . .i t. ,!) .!\ j;'..'1. ..r_',.... .q,. F!: ^q\ ; ' a ;:. ;i' \. i\..{ .! I .*1 .f ^\r,.'

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j t. -n' ..:.r .\...r:: :1. ,..^ : .ir. .. ;:' .. '

!:. .: ..' :.. .! ,r,' ,:.." . ..:) .' '' ..: -'.,1.'^1'j i::

J.,.1 ..':;' .i:.' -,..;ij,.;1'. .' ,, .: ,''.^.r y"i1"."1...-' :

a,,,

80cA888298E89A4e483F347888D8 B3 3 C

Paper / Suhject Cade: 37503 / MECHANICAL VIBRATION$I,.;q:,,

as shown in Figure 4 below, If both the arms are open to atmosphere, ddtermine theassh0wnlnt.igure4below'lfbotnthearmsareopentoatm"os.Phgrg;'d€ter.rning'.the.natural frequency of oscillation of the liquid column. ..:"' : .. .:i'::, r ., ,

\, t J -.;.",,ijr":*..._.:+.r : . ,

4E t{u:k.4ru'crt I Se,-t L 1 cAatS / % co ^4 Etat$Paper / Subject Code: 37504 / THERMAL AND FLUID POWER

(3 Hours)

zol&EI{GINEERINIG At f t z,[ u

Q.P.Code: 21486

[Total Marks:80

NOTE:

a

a

a

a

o

Questioir No I is COMPUTSORY , .,,,-.rr ;,:

Attempt any THREE queslions from question nurnber-2to 6

Assume suitable data wherever required, ::li:;.: , : ' l, :,,

Illustrate an$wers with sketches wherever re.quired,; r :

Use of steam table is permitted. :i'':;::rl"''l ,:i"i," . :' :

Q,1 Attempt anv Fr\lE of the followins:

a) Differentiate berween theexamples.

b)

c)

d)

.\u,,,

0

Q,2 (a)

Write the classification of the water turbines with example.

Explain the principle of,working of an impulse turbine.Wrire the classification of the rockets.

boiiers lvith

'k|/kg.' What is equivalent

20

,.a.'evapqration frbm the boiler & (ii) What is rhe rhermal efficiency of theboiler? Take Cp of superheared steam as 2.27 kl/kg K.

8

4

,ry ovER

.' '*1.-,.-,'

..,. .:.,-r.:.' ,l',,.nr

:..'.',"t ,' ,:; 08AE2D2E9D0CC501 567 I E7EE7E8t 0908

Write

I

rhb.hozzle of the impulse stage of a turbine;e'ilose to the maximum blade efficiency.

brrsidering equiangular blades and neglecring: a steam flow of 0.6 kg/s, the diagram power

jet engine and rocket engine.

Define

Paper / Subject Code: 37504 / THERMAL AND FLUID POWER

.'..:

,8

,8. 4'l

:i:

q.3 (a)

(b)

(c)

Q.4 (a)

(b)

Qs (a)

(2)

t!:

,::| :",

its applications

8

Q 6 (r) f',he foliowing dara perrain ro an inu,ard flou, reaction turbine: 12

Net head=60m, speed,= 550 rpm, Brake power = 275 kW, Ratio ol wheel

widrh ro wheel diamerer ar inlet = 0.10, ratio of inner diameter to outer

diamet'er = 0.5, flow ratio Kr = 0.17, rin=0,95 and 1o:0.85. The florv

, i.veiocrty-::emaips;cohstant and the discharge is radial. Neglecting area

the turbine.l

(b) Whar is draft rube and what are its functions?

(c) Define boiler mounting and accessories.

4'4

, 08AE2D2E9D0CC50 1 567 I E7EE7E8 I 0908

and velocity

lna

thermal efficiency of open

with the help of schematic

8

iread of 65m. 1t is proposed to test the model

llume where discharge is 400 litres ls,under a

Also

4 t Mc'b I nffo"*Jr,.-ff*f,r{r$,'#"af i'"$r-e0 Lg

rcf o/zot t

[Total marks:801{3 Hours)

Instructions:1. Question 1 compulsorY.2. r\ttempt arry threc questions fi'om the remaintttg five questions.

3 Assurne suitable data, if nccessilry.4, Figureslskctcltes carry weightage.

Explarn the fbllot,rrtg i An1'foui]I ) Concept of polling and interrupt2) I{arnronic Drive3) Parameiel's to be corrsrdered for selection of arl actuator

4) \\rorking princrpie of DC Motor5) Pick ancl place robot

Q2) a) Explain velocity profile in DC nlotor wrth suitable skerches.

'0) Explain cantilever beam vibration control usrng piezo sensors.

c) Explain rvrth a neat skctch offlce appiication of ivlechatronics.

Q3j a) Trvo riouble actlllg pDeurlatic cylinders are selectcd for an

sequence cf the movement is as given Lrelorv:-

(An)+ f)elaY, B-, A +Deiay"

Draw electro ptreumatic crrcuii using -5i2 DC valve rvhich rs

operated antl also sketch thc displacement diagrarn

20Q1)

06

08

06

industrial application ;The 10

strtgle solcnoid 311i! -sPrtlrg

b) hixpiain rvitli a ncat biock iliagram Penpheral Interiace Devtce"

a) Expiain rlttlr a neat sketch tl:e arcliitecttire of PI-C'

b) Explain different sensors anr-l actuators use d iu a car cngine management systenl

a) Explain the dif{erence betrveen Intenrai and Extemul Cear pumps 'uvith neat sketches'

b) Expiain the selection process of PLC"

c) Explain wttir a neat sketch the components of iVlechaironics.

tVrite short notes on:l) Voice coii Actr.rator

2i Accumttlators3) IrRI' trnrt4't Sr"rrveillance balloon

r0

lo

IU

08

0606

Qs)

Q4)

20Q6)

64264

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