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I C.S.£ -]'l'e 19% 1 or 1-t

MECHANICAL ENGINEERING J'

=======~

2.

3.

+.

In designing the !lutes of multiple·edged tools such as broaches and milling cmter's, which of the foll owing factors are tllken into consideration'? I The worl. ut31erial 2, Tqe size of lh« tool 3. Tbe degree to which· the chip curls -1. The rake angle o~ U1e tool Select the correct answer using the codes given below: a L2Md3 b. I. 2 and .I c. l , 3aud4 d 2. 3and~

>l'he tool life increa.~es with the n. increase in side cutting edge angle b. decrease u1 side rake angle c. decrease tn nose radius d decrease in bacl rake angle Given that S = feed m mmlre\'. and R = nose radlus In mm, the maximum height or surface roughness H., ... produced by a single-pomt lrnning tool is gil en by a S2f2R b. s2J4R c. S2/6R <l S~/~R Match List I with List n and select the oorrect answer using the codes give,n below the lists List I (Cutting tools) A. Stelute B. H.SS. C. Ceramic D. UCON List D (Major constituent) I Tungsten 2, Cobalt 3. AJuutina 4. Columbium Codes:

1\ B C D a, 5 I 3 ~

b. 2 I ~ 3

5.

v.

7

~.

9,

c. 2 3 4 <l 2 5 3 .j

Internal gears can be made by a hobbling b. gear shaping "~lh rack. cutter c. gear shaping \\ilh pinion cutter d. gang milling During ultrasonic machining the metal removal Is aJTected by the a. hammenl1£ action ofabms•ve. panicles b. rubbing nchon between tool ;md work

piece c, high rrequency sound waves d. high frequency eddy currentS Compound die perfom1s a. two or more operations at one station

tn one stroke b. two or more operations at different

stat• on~ fn one stroke c. only one operation and lhru too a1 one

work station d two operations at two different work

slillioi1S in the sume stroke Matc.h Ltst I wTth List II' and select the correct answer usmg the codes g, ven below ~Je losts List I (Filler rod nmterial) A Mi'ld steel B. Bronze C. Brass 0 , Lead and tin alloy List II (Joining process) I. MIG welding 2 Soldering 3. Brw,ing 4. TI>enuit welding 5. Braze welding Codes;

A B C 0 a ~ 5 3 l b. ~ 3 2 5 c. ~ 3 5 2 d. J ] 5 4 For tmld steel. the hoi forgmg temperature range is a. -too• C to 6ll0" C

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I (1.

u.

12.

13.

14.

b. 700° c 10 9000 c c. tuoo•c to t2tl0• (' cl. 1300° (' to 15()1,)• (' Apart from hc:.<tog•>nal t~t. the ckmenl(~) in a Wn'Ollnlbeinclude(8) o. cross-slide tool post b. cross-slide tool post and rear tool post c. cros•·~lide tool ro•t ond lail Ktflllk cl. real tool post anclt•i l stock Geneva medtanism is used 10 transfer C<lmponento fnll\1 bite Station to the uU1~r in n. an lnline lnlnllfer mnchine b. • I'Oloty tran.sf;,r m•ch.ine e. " l ink<:<~ line II an unlinked Oow ljnt Whfeb ono: of lh~ following proe<:!S;es is performed ln powder mctnllurgy to promote •elf-lubrlcnting prol""rtie. in sintered parts? n. lnfillmlion b. Impresnation .;. Ploling II. Gn!pbitiu liim Motch List l with l. ist n and seled the correCt llllswer us i11g the cod&.~ given hdQo. the lists List ! A. Time study B. Work f•clor system C. Micro-motion •li •~Y D. ('yell: !ifttph J.,ist U L S top watch 2. Clinollr•ph 3. Body m t>lnbur 4·. High <peed J)lm

5. Stn"ll ele<>hi c h11lb 6. C'odes:

A B C D ~ 4 3 2 b. 5 3 ~ 2 ~ 1 4 3 5 cL 1 3 4 s lJoder d1e Hm""'oo Jillidoncy Phn. the worker gets • nonnal w~ge ~~ the .:flieiency of

"" 50". h. 66 w•,. 1:. 75% d S5%

15.

lit.

J7.

18.

19.

20.

21.

2 i>l 14 Which of lbc following are true of product type layout'/ L No Oexfl>ilily 2. Roduc<.'Cinlll1e.ial h11ndling 3. Mf>sl 81Ji!tlblc lbt low-Vt)lunlc

pmtluctiun Select the correct answer using the cod'"' given helow ('odes a. I, 2 •nd 3 b. 1 :md 2 c. 1 alld 3

d. 211nd 3 S ima cltart< are used tor a. inspection or p•rt• b. o(icrator movements e. work dun" at on" place d. s imulation of mrxlols For sales forccnsting, pooling of "''l'M ,)pan ions is mude u~;e of in a. st~tistical correlation b. o~trhi technique c, '""' lng •vcr"!!c method d. <Oxponontiol smoolhing For moving orutd in bulk; over roller conveyors, the md inntion given to tl1e <:(mveyon; i~ u.sually a. 1• b. 4° c. 1" d, 10" Balance shoot refer• lo the finanoinl position of the Company a. fur a particular y~ar b. foro particular monUI c. in a pru:ticu lar shcp d. on • l>arlicl•lar dole n.c number of cycles lo be tinlod lD •

stopwatch lime s ludy depends upon the a. discretion of the lima study engineer b. time of e:ICh cycle and the 3ceuroey of

rc:. ults J CI!ited c. time ovuil•ble to lhe time study

engineer d. nntnre or the operation and as well "''

the operator Light •nd intrieato parts 'l•ifb dose· dimensional lok:rauW< or the mder of =

0.005 mm •re produced hy a. investment casting b. &lie I:JlSling

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I 22. I

:n

24.

c.. centrifugal cas1.mg d shell mould <>asting Whi~h of the fotlowin.g pairs urcl oOrrecOy matched'/ I. Project scheduling .... ......... CnticaJ

path analysis 2. Billch production .....• , , Lme of

balance schedulit(!l 3 Dispatching, .. .. Job order 4 Routing. .. Oantt chart Select the correct answe,· using the codes given belQW' Codes· a L311Jld 4 b. 1,2and4 c. 2 and 3 d l.land3 A cyclic pr<'<'ess A..BC ts shown on a V ­T diagram 111 f~. I.

·E. ,..,.,

The same process on a P - V diab>rnni wi II be represented as

~ 'lh. M 'l4. w ·~.

~ t~t An tdeal sas is heated (i) al conslam volume and (it) at Constant pressw'C from the tn~ual state l Which one of the

26

27

following diagrams shows processes correctly?

p·C

l•l Tvv.c

l

s

T

\C) '

s

T

(d)

•

J of 1·1 the two

The gtven tigme sbows a thermodynamic cycle ouT-s diagram. All Ute processes ·are straight lines, The effoctencv <)f the cycle IS giVen by .

1 ::~ .. r;· -·

R (0.5 T,, -Te)r r" b. 0.5 (Tb - Tc)rt,, e. (T,, • T<)/0.5 T,, d. (Tt, -o.s 'l'.)rr,, ln a thermodynamiC cycle consistinJ; of four pr<.>coss~s. the hcral :md work lifO as follows Q. I 30,-10. - 20, 5 W· + 3. + 1 0,-8, 0 The lhermal efficiency of the cycle Will be a, zero b 7.15% c, 14.33% d. 2M% Mal'ch List l (Devices) wilh List 0 (Thermodynamic cquallons) and selret th~.

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2$.

31

correcr answer using the codes given below the fists list 1 A, Turbine R. Noz~le C. Valve D Compressor List]] I W = h2 - ht 2 ht ~ ht 3. h, ~ hz~Vl,/ 2 4. W - h,-b, Codes:

A B C D

a, " 3 2 b 2 3 I 4 c. 4 ) I 2 d ;~ ~ 4 J rite cor or a Carnot heut pump used for heating n rOom ~~ 20°(' by exchanging heat with river Walcrilt IO"C is a, 0,5 b 2,0 ( . 28 . .1 II 29 3 A reversible eugi•lg !iK as shown iu the f,.;vep tigure draws 300 kcal from 200 K reservoir and does 50 kcal of work duri ng a cycle. The sum ofl1ea1 inle.ractions with ~1c ot11cr two reservoirs is given by

~ T- ~-~-C£. !.O kul

s. 01 + Q, =+ 250 koaJ b, Q1 + Q2=-2SOkcal a, Q, + Q, =+ 350 k~.J d Q1 -1 Ch = - 350 kcal Jn <••hidt one of the folh1wlng processes. is there an increase in entropy ,v;,h no degradation of energy? a. Polytrophic cxpan.slon b lsothermal e.~pansion c, lsochoric beal additiool d Isobaric heat addition Match List I with List II anc;l sclecr the oorrect answer using the codes given below tllelists Ust l

33.

34

35

36

A. Compression rario B. Pressure ratio C Cut-off ratio D. Explosion ratio List IT 1. Bray con cycle 2. Diesel cycle 3. Dua.l combustion cycle 4. Otto cycle Codes:

A B C' D a. 1 4 3 2

b. ' 4 2 J c, d.

4 4

1 3

3 2

•I ull ~

Jn the Rankine cycle the lower limit on the condones pressure is due to I lie

a. expansion limil in turbine b. coudenseJ' sj2e

c, air leal .. :age into I he condenser d. temperature f cooling water Which one of the following modifications to aRankinecycle wotild upgrade/enhance 1ts efficiency so as to approach that of Carnot cycle? a. Incomplete expansion of steam b. Reheating of steam c. Regenerntive teed heating by steam d. J'artial condensation of steam Tf an engine of 40 per cent thermal efticieney drives a refrigerator having a coefiic.ient of performance Clf 5, rhen the heat inplU 10 the engine for each kJ of heal re1nuved from tl1e cold body of 01e refrigerator is a. O.SO kJ b. 075 kJ c. I oo kJ d. I 25 kJ In an ideal vap<\ur compression refrigemtion cycle, tile enth;tlpy of the rcti:igerant at exit from lite condenser, C()mpressor and evaponuor is 80kJ/kg, 200kJ/kg and J 80kJ/kg respectively. The cocfiiciem of performance of the cycle is a, 6 b. 5 c, 3.5 d . 2.5 A Diesel nnd Ono cycle have the same compression ratio ' r' . Ute cut-on· rario of

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37

38.

39

40

41.

the cycle is's' Tite air ~tnndard efficiency ofth~ cycks will be equal when 11. s' - k(s - I) I• 0 b. t -k(s - I ) ; I • 0 c st - k(s- I) -+ I - 0

d. s' -(S • I) - k 0 In the case of a Diesel cyc.le, increasing the. cut-<>fl'ratio will increase a efficiency b. mean elfective pressure c the ma\imum pressure d the engine wcigbi For Lhe same compression nuio and d1e same heal inpul, lhe C(m'«< !!equence of the increasing order of the thermal elliciencies oflhe given cycles ts a Ouo. Diesel. dual b. Diesel. dual Otto c Dual , Diesel, Ono d Dual, Olio. Diesel Match L.i~l I (Mntcroals) with List II (Application in a nuclear reactor) and select the correct answer using the codes given below th., liSt> List I A Zircouiulll B. Graphite C. Liquid sodium D Cadinium Lis1 U I Cladding l Coolant J . Control rod 4. Shield Codes.

a b c. d

A I I 4 4

B

4 I

c 2 2 J 3

D l l

2 The distinguishing feature of Velwc boiler is that it a is drum less b uses supersonic gas vcloc.il) c. operates under supercritic:al pressure d uses indi~t heatin!! Out or the four curves (1. II. lU and IV) shown in rue given figure. the one which l'tlpresents isentropic !low through a ct~nvergcnt-divol'l!OIII nou.le is

4J

45

a I b. u "' m d. IV

5 u l I t

ln Oow through steam nozzles. the actual dischatge will be greater than the theoretical value when a steam at inlet is superheated b. steam at inle1 is saturated c steam gets supersaturaled d. steam at inlet is "et Dtgree of reaction is defined as the ratio or a. enthalpy drop i11 rnoving blades tv

enthalpy drop in fi~ed blades (}. enthalpy drop in lixed blades to. 101nl

enthalpy drop in moving and fix~'() blades

c. enthalpy drop in fixed blades to enthalpy dr011 in 111oving blade$

d. enthalpy drop in moving blades 10 toml enthalpy drop iJJ fixed and nwving blades

The maximum efliciency of a 50"/o reaction turbine with nozzle anglo a is

(:'.OS! (,1_ a.

l+cos'a l+oos'a

b leas' a

c. oosa 2=fa

d. l+cos'a

The blow-olfvalve of a boil e. helpi tu a provide safety b tnaintllln solid$ '" suspension belo" a

certain value c regulate !he flow of steam d . shut down the boiler In a convergent-divergent nonle, normal shock can generally occur a. along divergent portion and throat b along Ole convergent portion c. anywhere along the lenglh d. near the inlet

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47

48.

•19.

C'avil:tlions in 01 """'rifU!!lll pvmp IS lik;ely til occur at tile 3. impeller exit b i01peller mlill c. dtifu>ct exii d. in•·olute =•"!! Sp<cific speed of a lurbmc i~ l''""'' hy

N.JP Jl, H' a

Miluomt:tno ~fficieocy of • ce111rffugal pump is defmcd a; the ntbO of n. $uchon he:~d to the hend impnncd tly

die i10peller 10 "ater b. bend rmpartcd by the nnpdlcr l(l wMer

lo the Suction head c. manomeuk bead 10 the bead impac1cd

by lhe iulpedcr 10 warer d- head impaned by the impeller to water

to dJe manomeuic head 50. The schemalic dia!'nuu of a vapoHr

compn:ss;on rcliigemtion system can be represen1ed OJS

(d) • -c-­• --

51,

5.2.

SJ.

54,

ss.

lr or I-I The colour of lhe name of heal ide torch, '" a case of leakage ofFreoo refrij!e(Uill. will change to a. brighl green b. yellow e. red d OI'UJII!C

Which one nf lhc ri>llilwrnj~ n:lfit~etWIIO hus d1c lul'hat cnuc.l u:mpcr:llmc? n. Wnler b C'IU'!x'11 dio•ide Ct P'rcnn 12 d. Ammo~•• Tho ~ilUlificnnr nd\Ming:c ol 11~111!! ammomn ns n rcfnset11m ts iiJ a. churuolcri.Uc odoor b. hJJ:!)I f~le!U h<lll c. solubiUIY in wnter d. innwnmahiliiY The condihon of air for a cooling and dehwmdijicauoo system is W'et> by tbe point A at inwke, B 111 dis<;bargc us mru:kcd on u psycbomL'ttics chan. If C is the apparatus dew pomt.. the bypus faclor is siven by

a CAJAB b C'AIBC c. BC'IAB <l BCICA Wid> r'CSJiec:t ro the rollow111g figure wh1th shows four proccsse. on dtt p.s~ drrometric chart. lllulch List I wtfu l•$1 II ond •elect il\c correct iUISWcr usin@ I he code:< pi ven belm• I he hs~

List I A. Process R5 B. Process RT C Process Rll

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0 ProcessRW List u I. Cooling and bomidlt)dng 2 Sensible. heating 3 Cooling and dehumidifying 4. llumidifying COdes;

A B C D a , 2 3 I 4 ~ l 4 2 3 c. 3 I 4 2 d. 3 2 4 C'ons.ider !he following statements· llffective te1npera1Ure I l,c a measure of the sensation of

"'firmth or coldness 1 Is the unl form lemperature of a11

imaginary enclo,cure wi th which· mali will exchange the same dry he-dr by radiations aud cuune<:tiou as in the actuaJ envin:mment?

3 Combines the erTects of dry bulb 1emperature. wet bulb temperature aud air movemeu~

4. Of these statements a. l . 2 and are correct b. I aud 2 are correct c 2 aud 3 are correct d. I and 3 are correct Matoh .List I wi01 List U and stleot the correct answer usin£; the codes given below the lists lls1 J A. Steam spray into air B·. Air passi11g over a coil carryi11g steam C. Air passing over a coi l having

temperature less thau dew pow[ D. Air ~nsl\lng over • coi l having.

lemperanll'e above the dew point but bel ow tl1e wbt

List II I Sensible cqoli ng 2. Cooling and dehumidification J. J'feating and hmnidiflc.ation 4 Sensible heating Codes:

A B C D a. 2 1 3 4 b 3 I 2 4 c. J 4 2 I d 4 3 2 I

58.

59

60,

61

7 of 14 Durfn~chemTcal dehumidification a. wet bulb temperature remains constauL

but entllalpy changes b, dry bulb temperswre remains constant c. both dew point aiiil wet bulb

remperature remain constant d. enthalpy nd wet bulb 1emperature

remain consfam Match List I (Laws) wirh Lls1 n (l>henomena and select 1he corrtct answer using_ the codes given below the lists List I A. Hydrostatic law B Newton's law C l'ascal's law D. BcmouJii's l·aw Listn I Pressure at a point is equal in <til

dlre<:ti(lu~ iu a fi\Jid at rest 2. Shear mess is direclly proponional to

velocity j!flldiCJit in fluid llow 3. Rate of change of pres~·nre in a venical

direction is proportional to specitic weight of fluid

Codes.

il.

b.

A B C 0 5 2

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62

from under a gate omo the floor Tite ratio of velocities v,~ to V u 1s

1'"'"'~'1 4m

R " + a __ ! _

''fll .. r a. ./512 b. 'A ~. 2

d 11{2 BemoulU 's thoorcm

l'l L +- • Z ~ constant is valid pg lg

a. al·ong different streamlines in rotation.al flow

b. along differo.nt strea.Jlllioes jJJ

ilrigational flow c.. ouly iuthe CIISe offlow of gas d only in fhe ca5eof flow ofliqtoid

63. A vertical je.t of water 'd' cot in diameter IE:jjving the nozzle witlt a velocity of V mh strikes a disc weiglting ' W' kgf as shown in tloe. given figure. The jet is then dcOected twriw maUy T he disc, wi.ll be held in equiUbrium al a distance 'y' where tbe fluid velocity is ·u•. whey 'y' is equal to

}

a. (V7 - u2)12~;:

b V~/2g c. WN" d. W/u1

64 Two p1velines of eqtull leng~hs are connected in series, 1"he diameter of the seco11d pipe i$ two times that ol' the first pipe. The ratio of frictional head losses between the first pipe and the second pipe is

55

~ u! I I a. I 11 b. I 16 c. I 8 d. 1·4 The wale< level In rut empty vertical cylindrfcal tank with top open is to be taiscd b)' 6 m frOm a nearby rtscrvoir. The ratio of the cost of pumping through pipes. A and B (see given ligur.e} is

I a. I , 6 b ? · ~

- · ~ G. 1 ' 2 <\. 3 · 5

66. The following instruments are used in tJJe measurement of tli~charge ~>rough a pipe 1 Ori lice meter '2. t'low nozzle 1, Venturimeter Tlte cormct 5equenoo of ~1e ascending order of the head loss i11 these instrull\ents is a. I, 3, 2 b I 2,J c. J. 2, I d, 2, 3, I

67 Jf a fluid jet discharging, from a 50 mw diamelt!( 0\'i fice has a 40 111111 diAm•ter 'It 1ts vena oontracta. then its coe!Ticient of oontraction will be 1!. 0,32 b. 0.64 C, 0.96 d, I 64

68. Bound~ry layer separatio" is cau•ed by a, red11cri01i of pressure bel ow vapo~r

pressure b. reduction of pressure gradient to ?-em c. an ~dverse pressure gradient d, reductivn of bou11dary layer to zero

thickness 69 The velocity distribution in laminar now'

through a circular pipe ollows tlte 1!, lioeur litw b parabolic law

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to.

71.

74.

c. cubic power lnw d log~rithmio law 11le velocity distrihution in the hound'lfY lay<lr uvcr th~ fJce of • high spillway fo.uud to have tho foUuwing form;

u ( " )41

' ;;~ &

AJ> c-ertain ,,ettion, ll•~ frc:e ~lr<oam veloctty u was found to be 20 m/¥ nnd the boundaJ'~ Inver thicknasl w~ e:~tim3l•'<~ to be 5 em. 'tie dispblcemenllhiol;nes.s ~~ n, l ,Ocm b. 2,\) Ctll

<!. 4.0 em

d. 5.0 em As.scmiort (i\); :\ particle under equtlibrium moves with ecms~:~nl vdMI~. Rea~on <R): Tl' lbe re!luhJJ1l force nchng over 3 rnrtic\c, i• ;tei'O. 111tu lhl> llliL1 [clc will buill rost or- oontinue to rnovc vt'iU1 l.hu some velocity. if originally in motion. n. Jjotll A and R are true and R i• lh<>

c;;n'llcl expi4Mllon of A b. BoUt •\ and R arc true but R is no1 a

~rrect cxplnMtion of A c. A is true but R is false d. A is fal•e butR i$ true Assertion (A): 'I he temperature ccnttol •11' "" eleciJ'ic. iron is an cll(omplo M !iicrvomothunism. Rcoson (R): ll "' an ~u'IJJm•tic controL •ystem. n, Both A and R are IJ'Ue and R is the

~orrect explnlllltlon of A b. 13otb A •nd R liJ\: IJ ue llut R It not •

rorrect CXJlfnnat:lon of A c. A is true bur R t~ false d. A i; r~ Is<;' l>nl R i• trt•e Assel1ion (A): 11te longitudinal. transverl!<> amL tor~ional vibrati<111S al'e ~implc

h:annnnic. Reason (R): The reslllnng force or couple is propo•tional to velocity in the case of tbo:se vib•·t~tioiiJI. 4. Both J.\ lod R fil'<l true find R is tho

correct cxplo.nntion of A h. Both A and R are true but R L• no t •

con·ect explanation of A c. A is truo buL.R is false d. A is f•l~c butR is lr!lt Anc11lou (A): A pair of g~;u .. fonus • rolling pair.

75.

76.

77.

78.

? or I•• Reason (Rl: 'Il•e gear drive i• n positive drive. a. BoUt A and R. ore true and R 1s the

com:et «'q)lan."ion of A b. Bolh A nnd R are IJ'ue but R is not •

correct exp.lanotion of A c.. 1\ is tme but R is r:, lse d. A is false but R is tme A,<sertion (AJ: Stress-strain c<~Nes li>r brittle mnto.1rinls do not exhibit J'ield poinl. R=on (R): Brittle moterial$ fo~ without yielding. a. Botb A and R. are true nod R is the

eorrect explanntion c;f A b. BoU1 A •nu R are true but R i~ not •

correct cxpbn~tion or A c, A is true bul R is fnl!<e d. ,\ is f•l•e hut R is lrue Assertion 1 A): ('onc..'lllric cyllmlrioal hclieal spri•ISs wllich OI'C u•cd to ha ve ga·cltc:r -,pl'ing fon;e in: u limited .atp:1cc :are wn~ntl in <>pposite direct ic)n~,

Re.1son (l~): Winding in oppru;ile direeticms prevc:rtiS luc.lcing ofthe two coils in ca•o of mholigrm•~nt or buckling. a. Both A nnd R nre truo and R os a,.,.

correct eKplanation of A b. Both A m1d R are 1rue but R Is not a

c.Orn:ct explt111uliOn ()I' A e. ,\is true but R is false d. A is false but R is true Ao;sertion (A) : The moch innhility of • luaterial c.'ln be mt>tsured 'Ill an #b~oluk qWiotlly, .Renson (R): Maehiuabilily ind<>x indicates the eas~ with which J mah:rinJ can bu n••chioed. a, 13uth A 1111d R •re hue and R is lhe

eor~I.C)(planMion of' A b. Both A and R ""' !rue hut R is mll •

c.oml<:l el(plunnlion of i\ c. A is lrne hut R i~ f•hle d. A is Ioise but R is true Assertion (A): Ole casting yields a produttl of good ~CCUI .. C)' und finisl1. Reason (R)' Low melting alloy• nre used in die Ci16ling. a, Bolh A (m~ R ~rc< 1ntc ~nd R is the

com:ct o:~~pl•n:uion of A b. Bolh A 31ld R are lr\IC but R i5 nul a

cornx:t C.'<plonntion or A c. A i• trne but R is f.1lsc

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N .

RO,

81.

'L 1\ is fob~ but R is true linear

the for

Asiertion (A); Margi11al cost in break-e'l•en analysis provides manag~ment wltb 1J$~ful inform•lioo price fiXing. Re.~on ( R); The· marginal cost is the ma.xtmum value ~ t whil:.h tltc jlrodnef selllng price must b.: filtcd w noctJV.:r oll lite cos!J<. n. Bolh A ~nd R are tnoe. und R iJ the

con-ect eX]Jitmahon of A h. Both A and R are true hut R ls not •

.:offllcl txplan:otlon of A .!. A is lnle but R u f~l>e tl. A is fa be but R is true 1\ssertion (I\): Air i• a pure snbslllnce but a mi:<hore of air •nd liquid air in a ~ylinder is uot a pun: • uhslrute<:. Re•wn (R): Air is homogeneous i.u ct,mpQSltion. but .1 mi.:dm-e of Jlir .md liquid oir i~ heterogenemos. a, Both A and R •re Lnoe :ond R is the

com:ct e;oq>latmtiou of A b. Both .'\ >nd R an: lro~ but R J$. not •

correct expl1mation of A c. A is true but R t• fal~e tl A is f~ lse bot R i$ tnoe Assertion (A): An economizer is placed between Uto boiler und Ute c.himnty tu recover heat C3.rTied -away in the flue go.ses. Rea~on (~): ('ombn~ti<ln ;ott can e"~ily

ab~tract ""'"" hcit fi-om o.be ·nuc gas<:$ f!1at would oUtcrwi~e flll~ up the chimney. "" Both A ;md It ore lnoc und R i• Uto

CQrrect e;<pl:molion of A I> Bnlh :m~ R are lrue but R i~ 1101 •

c<mect e~<vlanation of A c. A i:nruo but R is false d. A is fahle but R is lrue t\s~c.'l'tioo (A): Tn mnny ~scs, U1e peak load hydroelectric pl~nl• •Upply power (luring avcr.~gc load as also during pc:rt.. lvtuL whottt''"' ocquircd. Reason (R): 11 ydrodcctric plrutts. .:m s«ncrnte 0 very wide fOilS<' of electric jlOWer. and it is a simple exercise h> restart vowel generation and c:ouuec.tiug lo tJu: pow"r grid. n. B<lt.lt A and R •rc lrue untl R i• thu

co!Tect expbnali<lt1 11f A b. Both A and R are tr11e btn R L• nOI 4

oom:ct cJt1lloMtitm ol' A c.. A is lruo but R is faille

84.

85.

86.

10 nl 1•1 d. i\ i~ fnlse but R is true 1\sseniq" 1 1\); The liquill waste trom n nueleAo· pnwcr nl~nl is conc~tralt:d I<) • smuU volume md stored. ill uod.,rgt'Otllld tanks. R.ea~on (R) ; Dilution of rn.dio•ctive liquid w:JSte is nol desinbla due lo the nature of the isotop .... u. Bolli A and R are tnw 011d R is Ote

c=t cxphtnotion of A h. Both A and f( are true but R ~~ not •

eo"""t explan.~t.ion or A c, A is tru:> but R is f•l<e d. A is liol>!c but R is true AMcrtioo (A): Condensers of large rt1frigernling plants inchl<ling central air· conditioning systettiS are invariably woter· cooled~

R.t::~•ott (R): Wol<.>f C. ovniloble •• • temper:otttre lower than that nf Inc ~urroun<iiug uir 3n~l l10s u ht(>ilcr specific lteoL u. Botlt A and R lll'C lruo ond R is Ute

eorn:ct e,..:phnntion of A h. Both A "·"" R ore tnJc hm R i• not a

com:ct explanution of A

c, A i• tnoe but R is. false d. A is false but R i!. true A.ssertion (A): In .t R.ota meter dte fluid Oows from lhc bottom of the coni<::~ I Rota meier tube with d/vetgence in the 11pward direction •ml the Jl<'l~lt ;,, or the metering Ooat iodi<:tottl(JJhc discloargo. Rca•un (R.): Rota meter Ooat indiol.'IIC$ the di~chargc in lemi$ of~~ rotation. a. Both A and R •re true ond R Ls the

1.\0rt«t "Xillonatlon of A b. BoUt A •ntl R arc true but R is nol o

c=t cxpibnation of A c. .\ is true but R is fal!;e d. ;\ ;. false hut n is tme Asser1lon ~A)! Tile tllodmc!!S <ll' boundar)' lay<:t can nut "'"' c..~oclly dcfmcd. Reason (Rl: The '"locity williin the bound:uy layor approache& the in vi.•dd vel~Jdty asynoptotic:tlly, a. Both A and R are true and R J.s the

corr<ct tttpl~ootion of A b. BoU1 A and R are true but R is 1101 •

correct e.'q>lan.1tlon of A e; A i~ true but R is f.1l~e d. A b fobc but R is true

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87

88

R9

90,

Match List I with List II and select the correct answer using the codes given below the lists Ltst l A. Lamia's theorem B. Varignon,s theorem C. Newton's First Law of Motion D. Polygon Law of forces List u I Detemtination of the poSt~on or

I esuhanl Of pamJlef fOICes 2 Definition of the genernl condition of

equilibrium 3 Determination of the rcsultan1 of non­

parallel forces 4. Estimation of the three forces on a

body in equllibrium Codes:

A B C 0 a 4 I 2 3 b l 4 3 2 ~ l 4 2 3 d. 4 I 3 2 l'he road roll er shown in the _given li'gure is being moved over an obstacle by a pull •p_ The value of •p• required will be the mini mum when it is

a. horizontal b. vertical c at 4~• h) the horizontal d. perpendicular to tl1e li11e CO Two forces A nnd B are acting at an angle6. Their resultant ' R' wil l make ru1

1Uigle c;t witlt the force A, such that cos 9 is equal to

8 . r~A,;,•'::'E;;,;;;si;;,n I);;.,.=:'

.J A' • B' - lABoosO Hsinll

b. -r=:==c:~== .JA= · B1 ,.2ABcosO

~ A • BcosO

.J A' • Ll' t 2Aflcos8 Bros8

d. r=:==~~== .J .4' • 8' - 2A8cos0

The motion of a particle (distance in meters and ri me in seconds) isgiven by du< equation

I I of I t ,v=it' I 3/ Starting from l = 0, to attai'n a veloci1)' of<> 1!1/s, U1e pruticle wi ll have to travel a dislanoe of a, 5m b. 10m c. ISm d. aom

91 A bullet is fired vertically upward~ from a rifle, with a velocity of ItO ntis. from 01e lop of II 115 m high tower lfg = 10 ntis\ the- velocity wi th whicl1 the bullel will suike the ground is a. 220 uti• b. 175 m/s e. 120 m/s d. I 15 m/s

92.. The escape ltelocily from the surface oftlte earth is approximately equal to a, 9,8 1 Innis b. 1 1.2 kntls G. l4.01mtls d. 22.0 ~ IWS

93 The springs of a chest expander are 60 em long when wrscratched, Their sti ITness is 10 N/mm, The work done in stretching them to l 00 em is a. 600Nm b 800Nm c. IOOONm d. 1600.Nm

IH Jf Ute momentum of " given partiele is doubled, then its kioeuc energy will btl' a. doubled b. quadrupled c. halved d. uuaffected

95 A sli~er crank mech~ni sm is shown in fhe given figure.

L •~ · T

'"•

0

Which of the following expressions stand for crank effort I. Fv.sln(B+?)

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2. Fj r••nB+(":"" ) 3. F, OM

~ . F.-r

Seh:l;l Ute corre>;t ao.."v1:1· usn~ tbe ~odes given below Code5: n. l <tnd 3 b. I. lund 4 c, l. hnd 3 cL 2.1and4

%. For L nurnb<:r of link~ in ll mechani~"'· the number of pc>sllibl¢ inversion• ;_, cctu:llt(l n. L-2 b. J., • I c. L d. L • I

97. Oldhnm•s coupling is the inve.,. ion of

'" fOW' bar moeharusm b. c.:rank and lever mi:Cbonism e. single s lider crank mech:mism d double 5lider crook mcchnni~m

98. 'Moe tooth profi le most e.ommonly used in gear llrlves for pow"r transmission is :1, A cycloid b. An itl\'olutu c. An ellipse d A pZil'llbo!JI

')C)_ Consider the 1\)llowing srnretnenU<: For • proper hydrooyn,mic lnbrication for 11 given joW'MI bearing, I. ·n .. ~ hi&Jicr the viscos ity. the lllw¢r the

o'l)tnting speed needed to notot tlw j<)w·n:ol (ot o given loncl

2. '111e higher the rotating sJ)O<lO, lhe higher tho bearing load nccclcd to noot lhe jolU'rul.l ala given ·viscosity.

3. The hogher th<> bearing load, the higher lheviS<-'<>sity needed to flnat the. journal ut • ~ven speed.

Of the.~e ~lllto onent~ n. 1. 2 and 3 1ll'o oorn;ot b. 1 and 2 are con·ect c, 2 oml 3 are corn:<:l d. 1 and.3 are con-eel

100. Tile radjus of gyrotion of 3 sol'ld disc type Oywboa1 of diAmeter ·n· i~ "' D b. 012 c. Dl .fi

1 ~ utl4

d. [ ~Jo IOL A Hywhee1 h.s a mass qf 3()0kg and a

r•clius or gytatiou of 1m. It i.~ giwn • spin of 100 r.p.m.. about its horizontal axis. Th" w'bole assembly roL1tes :sbout 3 vertical axi3 at 6 r~dfsec. l'lte gyroscopic couple experienced will be ~. 3 it k.'Jnl b. 6 ll lu'lnl c. 18() kNm d. 360 " kNm

102. A llirtwcll.govcmur ;,. a governor of1he a. inerli1 type b. pendulum type e. centrifugal type d. de.1d weight type

103. A governor is s oid to be irocbronollii wh"n the cttuiiibrium ~pood for oil rodii or rotation of the ball• within tl1o woridng range a. is not constant b. is constant e; ''nri~-s unifonnly d. hcos uniJ\mn•occelcr.~tion

l 04. In rcciprt>oatiniJ engines primory forces 11. •re completely b3lanc.::d h. or<; partially balanec.l c. ore bolonce.d by se.ccondary fot\les d. connot be boloncc:d

105. CotLSidc:r IJ~e iollowiJl8 •t•t>:ments; Tho period of oscillation of U1c fl11id colwnn in~ U-tube dq~encb up()n the I tliam~ter Mthc I '-nobc 2. lcl\gth t)!'th" lluill cohlmn 3. :u:celer~tion du~ 10 gravity Of Utesc ~!ltloment.s u. 1, 2 nud 3 are com:d b. I nod 3 nrc. oorTed c. l and 2 are C.OrTect d. 2 Md J are COrTe~t

106. rr danll>ing factor in "vibrnting system is unity. then th<; system wiU ~~ . have nc,t vil>taticlns b. be highly d•mped c. be under damped d. be criti"" lly domped

107. For stct~dy-state forced VIbration•- tile phJtse lag ul MOttance is a. o• b. 45•

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108

109.

110

c. 90" d 180° An idealiz~d srress-strain cwve for a

:""'1E"'•••mb, -·

"tL- -1"" ~

~~

"t~ ld L_

_,

~~ tL_ For whic.h one of the following two­dimensional states of stress will the Mohr's stress circle degenerate into a P-Oint:? (a)

!Ot' ,-

(c)

a •

• (d)

0

' ·~.'=='~.·

T T. The maxi mum shear srress induced in a thin-walled cyJiJldricaJ shell having au iutemal diameter 'D' and thickness ' l'. 1vhen subjected Ia an internal pressure ·p' is equal co

JIJ

112.

113

a. pD/t b. pD/2t c;, p0/4t d. pD/81

IJ u ( I 1

A red of length, ~ I " tapers unifo1mly from a diameter ".Dt" to a diameter "Di' and carries an axial tensile load of ' P'. The extension of the rod is (E represents tl1e modulus of elasticity of the mate1ial of the rod)

a.

b

c.

<>I' I rr-ED, D,

41'£1

;r /.l D: 1tH I' I 4/J1 D,

:tPL

Mateh List J with LISt 11 and select the c.onect answer using the codes !,'iVen below the ljsls List I (Mechanical properties) A. Torsional rigidity B. Modtdus of resilience. C. Bauschinger effect D. Fle:«utal rigidity List II (Characteristics) 1. l'r(lduct ol Yqung's modulus and

seCQnd moment of area about the pla,ne of bending

2. Straiat energy per unit volume J . Torque per unit angle of twist -1. Loss or mechanical energy due to local

yieldin.g Codes;

A B (' D a. I 3 4 2 b. J 2 4 I ~ 2 4 I 3 d. J J 4 2 Match List I with List It and select the correct answer usirlg the codes given below tJae lis~ List T (Mechanical properties) A. Ductility. 8 Hardness C' Mal lealliliiY D. Toughness Llst lJ. (M~ning of properties) I. Resistance to indentation

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2 i\bltlty to absorb energy during plastic dcfonnation

J, Percentage of elongation ·1. Ability to bo rolled into Oat product$ Co!les;

A B c D ~. l 4 3 2 b 1 4 2 C, 1 3 4 I d 3 4 2

114 The Ei&Slic Constants E at>d K are related as(v [s thePoisson·s ratim a. E = 2K(t-2v) b, E=3K ( I -2v) c. E = 3K(I > v} d. B = 2K(l + 2v)

!IS lu a cantilever beam, if lloe length is doubled whill> keeping Ul< CrOSS·SC'CUUII

and the concentrated load acting at the froo end llte same. the deflection at the free end will increase by a. 2.66 rimes b 3 tiuo~s c, 6 times d. 8times

116 (I point, along the length of a beam subjecied to loads, where bending momeno changes its sign, is known as tlte point of ~. Inflexion

117

b. maximum stress c, ?..ero shear torte d contra flexure A Stll!ctural member ABCD is loaded as shown in the given figure. The shearing force at aoy section on the length BC of the. member is

r . D l L [-·_,

a zerl) b p c. l'u/k d. Pk/a

•

118 For the design or a shaft, subjected 10 bending moment 'M• and torque 'T' equivalent bending noomenl is given by

a. ~M' +T'

119

12.0

b. f[M-.JM'+r,] c, _l[M+f]

4

d. ~[ .JAP T']

1·1 u ( I ~

Consider the following types of stresses 1 Torsional shear 2. Trans,•crse direct shear 3. bending stress The -stresses that are produced in the wire or a close-collcd helical spring subjected 't(> an axial load. would include a. I and J b. I and 2 c. 2 and 3 d. I 2 and 3 Which one of the following !!faphs represents Von Mises yit>ld cri terion?

"2

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