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I I.E.S- (OIU ) 200(1 I ol 14

I MECHANICAL ENGINEERING J ~-==:::::'J

PAPER-I

I. ln an open U tube conwinmg mercury , kerosene of specific gra1•ity 0-8 is poured into one of its limbs so thaJ the length or col utml of kerosene is about -10 em. The level of mercury column on that limb os lowered approximately by how much''

3.

4.

a 2Acm b. 1,2cm c, 31icm

d. 0.6 CUI

Whoch one of the following ts correcrl Th« caplllruy nse on depression on <I small diameter tube is a. directly proportional lo the Specific

weight of the U uid b. invcrsel,• proportoonal to the surface

tension c. inversely propol1ionallo the diameter d dire~tl_~ proportional to the surface area What os the pressure Inside a so<~p bubble. over the atmospheric pressure i r its doamcter ts 2 em and ~1e surface tension •s

tl.l li·r m

a. o\.4 N/m1

b. 4.ll N/m;

c. 40.0 N/m2

d. 4(1(1, N/m1

Matcl1 List l with List 11 and select the correct ans"er using the cooe g1ven below the lists: Lost-1 !Devices) i\, Coolmg tower B Air coolers C E' apornror coil D Air cooled condenser Ltstll

(Process unde,rgone by air)

Heatmg

5.

(,

7

R

'},

2. Cooling nnd deJJUmidilication 3. Cooling and humidification 4. Heating and humidilicalion Code;

A B c D

u. 2 4 3

b 4 3 2 1

c. 2 3 .j

d. .j I 2 3

Wluch one of' the following ts correct'' On psychrometric chan. 01e cotiSiant \\el. bulb temperature lines coinctde woth a. constant relati,·e humidity lines b. constant enthalpy lmes c. constant dew point temp~rdture lines d. constant •olwne lines Which one of ~10 following is rorrucr! In a sensible heating or cooling process a. dl)' bulb temperature remains constant b. wei bulb temf)<lrature remains constant c. the. humidtty rnuo remains c<>nstant d. the relative bunudity re!llilins consuu>i Which one of ~te folio" ing is correel'/ Equal friction method or designing duo IS is preferred a. when system is balanced b. when S)'Siem is not balanced c. only for return ducts d, for any system Wluc.b non -dimensional number relates the ihermal bow1druy Ia~ cr and hydrodynanlic boundary layer'l a. Rayleigh number b. Peclet uwnbe.r c. Grushof numb~r d. Prandtl number Match list I 11'1 ~~ List II and select the. correc.t answer usmg the code given below ~1e lists:

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10

I I

12

List-!

(Application)

A 0.$ 10 liquid,

B. Space vehicle

c Condenser

D. Air pre-heater

List-11 (TYJle of Heat E.xchanger) I Compact 2 Shel l and T11be 3. Finnod tube

4. Regenerative

Code

A B

11. 2 4 b. 3 1

c. 2 J

d 3 4

c 3 2

3

2

[)

4 4

Which one of the following is correct'/ Fins are used to increase the heat transfer from a surface by a. increasing tlte temperature difference

b i ~creasing the effective surface area c increasing the convective heat transfer

coeflic.ient

d none of the above The value of thermal conduct! vity of themtal insulation applied to a hollow spherical vessel containing very hm

material is 0.5 ~ The convectiv~ m-K

heat transfer coefficient at the outer surface of insulation is 10 Wlm2 K. What is the critical radius or the. sphere'' a. 0.1 m b 0.2 m c. I.Om d. 2.0 Ul

A composite wall of a I'(Jmace has 2 layers of equal thickness having thermal conductivities in the rati o of3 . 2 What is the ratio or the temperature drt>p across the two lay en;? a. 2 · 3

b. 3 . 2

c I 2

13

14

15.

Zuf l l d. loge 2 · log. 3

In which one of the following matetials. is the heat energy propagation ntinimum due to conduction heat transfer?

a. Lead b. Copper c. Water d . Air Match List l wiU1 List U and select tl>e correct answer u;;ing tlle cod" given bc.luw the lists: List I A Heat transfer through solid

B Heat transfer from hot surface to surrnunding nuid

C Heat transferin boi I ing liquid D. Heat transfer from one body another

body separatod io space List 0 I Radiation heat tran;;fer 1, Fourier's law of heat conductio11

3 Convection heat tmn~fer 4. Newton's law of cooling Code:

A B c D

a. 3 2 4 b. ~ ~ 3 1

c. 2 .l 4

d. 3 4 2 I

T2~ t2oo• c

T1 = 1325' C m:: • 25'C

-----'t<-300 mm-->!

A wall as shown above, is made up of two Jayer. (A) and /B) rhe temperatures are also shown in the sketch. The rario of thermal conductivtly of two layers is k _ ._1 =' ~B -

What is the ratio of thickness of two layers?

a. 0. 105 b. 0.213 0 , 0.555

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d. 0.840

What is the oritiC31 mdiu. ofins uL1.tion lor n sphere equal to?

k - thermul C<Jnclw:m•ttv In -1-:

[ w l It : hem rransj~r coefficiem in ~

tu· K

n. 2.kh

" · 2kih ~. k/h

d. .J2klt

Dirodion~ : Each of the following four (4) items consists of two sootements. one labelled as tho ·Ass<::rtion (A)' and the other II$ 'Rc.1son (R\' \"u a.rc to examine Ut~o two stntomonts carefully and select the ans•.-''OB io the'e items using the codefi given below: C'oiles:

(3)

(b)

(~)

(d )

17.

IK

19.

20.

!:loth A and R .re ondividually U"Ue ond R is U>e correct el'planation of A

Both A nnd Rare individually true but R 1o nol l he c.orrect cxplanatiun Of A

A os true but R is lalse

1\ i• false bul R •• true

Assertion (AI: lu tlu: boundary lay ... concept. the ~hear stress •I the outer edg" of >he layer t• considered to be 7.01'0,

1-ctoal velocity i!\ uhnoo;l equal to velocity ln potenlinl flow. As;enion lA): A normal shock wave can occur ;~t any section iu :t conver;genl· divcrgentuou.Jc.

Reason (R): A !lollu•l shock •v•ve ocouo•s only wbL'D Ute flow of the flllid is supersonic nod U10 >Ub~e<IUCnt flow after the shock is subsrnuc.

Af<ser1ion (A): Non-metal> are having higher th<:rmDI ~ondu~tivily !han met.!&·.

Reason (R): 1:ree electrons in the melols :ore higher th•n those of nonme!n ls .

A-.enion (A); l'hc ce11t.rt: of pr~surc for • \'crt.ical surf•,_.., submf:t'gcd in a liquid lie$ nbow the centroid (centre of gr~vity) or the 1 enic,.l surf•ce.

21.

22.

1.3.

24.

25.

~ ol 14 Re;oson (R): l'hc dist~nce of the cenlrtt of pressure from the tree suriacc <>f the tiqui;l for n vertical su.rf~ce $ul>merged in • liquid is indClpcndcnt of lbc density of the liquid.

i\ rectongtolnr plate 0.75m " 2..4 m t. immersed in a liquid of relotive density 0.85 witlo it$ 0,75 "' s ide horizuntol and just •t Ill<> water &w:l:>ce. Jf the pl:we nf plate mal--es an nngle of 611° with the hori?.onral. what is the nppro.~m~tc l><cSJ<utc force on un<> s id<:: of the plate~

a. UOkN b. 15.60 kN

c. 18.00 leN d. 24.00 kN

The stream fwoction in a Jluw field is given by ~· ~ 2xy. In tl1c same flow fiold. what is the velocity 111 • poi no ( 2. I)?

a, 4 unit

b. 5.4 unit

~- 1.1:- uu.il d. +.47 unit

A steady. incompressible Oow ls given by: u = 2>0 + y' and v : - 4~y

Wha1 iR the etJnVeetive :~ccelcrarion along ,, ·dirt:dion 3l poln l ( t. 2)'1

a. a. = 6un it

b. tlx ::- U unit

c._ ·'.ll :: 8 unit

d. •• -24 unit Wllich one of Uoe toUo" iug is correct? Fot Oo\\ of M ideal lluid over~ evlindcr. from the front stagnation point, · a, pre&Sllre fU"Sl dccrcmte!i tlnm increases

b. velocity 1irst decrctl5\JS- lhcn incruascs

c.. p1cssurc rc:maUt'i lhc ~tunc

d. velocil) remains tloe snmo

Two Oows •re spedl;ed as

A. u y. v =- < ~12).<

a. u= xy:.._ v = x':y Which one of the foUowing c;m be concluded

4 . Both flow• ore rotation• I

1>. Both flows oru uTotationol

c. Flo" A is rot•tional "!tile 11ow B is irrotnticmal

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1().

28.

29.

30.

d. flow A is irrotaliona( while Ouw B is rotational

Which llne l'f the t(lllowin~ 1s ~urrect? In the now past btun'bodies

a. pressure drag is smaller than friction drag-

h. (iiction dl'tlg occupies the major part ol' total drag

c. pressure drag occupies the major pan of tuta! drag

d. pressure drag is Jess than Umt ot' meamlined bod)

Which one of the following is correct? In a full~ tlevelopro region of the pip~ flow. a. the velocity proli lc continuously

c.hanges lrom linear lo parabolic shape b. the pressure gradient remains constant

iu the tlownstream direction

c._ lh~ pressure gradie-nt tonli.uuously changes exceeding the wall shear stress in the downstream direction

d. the pipe Is not running full A balloon wlrich is initially collapscJ and flat is s lowly lilted with a gas at 1()0 kPa so as to limn it into a sphere of I m radius. Wlmt is the work clone by tlle gas in the bulloun during the fi ll lng pr~-ess'l

a. 428.\1 kJ b. 420.9 k.l

c. 4 16.9 kJ

d. 418.9 kJ

An ideal gas at 17" C is h~atcd at constant pressure till Its volume becomes three times. What would be then the temperature of gas? a. 81° C b. 627° c c. 543° c d. 327° c A ~ k W. 10 I itre water heater is switched on for H) minutes. l'he heat capac.ity <:. for w~ter is 4 kJ/kg K. Assuming nil the electrical enerro• has gone imo heating the warcr, what is the increase. of lhc- wat.~r temperature?

a. I5° C b. !()"('

c. 26° c

32.

.1 or 11 d. Jo• c 'l'wo pulytropie prt>ccsses undergone hy u perfect gas are shown below in the pressure-volume co-ordinates.

• Which representation shows correctly lite above processes on the temperature · t ntropy co-ordinate-s 'I

,.

a.

b.

c.

d.

1

~2 3

L----S

L----S

·r I t

tL. l

·A. 2

1-- ---S

A Carnot engine op<:rates between 327° C and 27•c . If the eng1ne produces JOO kJ of \York. entropy change during heal what is Ute additiou? a. 0.51<.1/K

b. 1.0 kJ/K

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34.

35.

36.

c. I .S k.ltK

d. 2,0 I<JIK

Whiolt of the foUowing statement.> i& c.orrect? a, Ute utoJ'CO.e in entropy i> obllline~

from ~ given qunntit}' of heat transfor at a low tempeFal ure.

b. The change in <>ntropy mny be o-egard...J ru; o n1easu"' of the mte. of Ute >vnilallllily of heal for lr:lllsfonnation into work.

c. Ute entropy represent~ thu maximum amount "f work obtnimtblc per degree drot> io lcmpcratur"

ct. All ol'the ~hove

\Vha! is the loss of avni hblc cnergy a.•~oeiated with '"" lransf<.,. or 1000 1<.1 nl' )teal from n OOR~Ianltemperalure ~y~h:n• at 600 K [() •n<>thotr M 400 K "hen Ute environmcntnl ternpemmro is ~00 K1 • . 1 50 1<.1

b. 250 kJ

c. 166.67 kJ

d. 180 kJ

Why is an au \~>«:1 used in a =iproC<~Iiog pump'/

'" To obtai" a continuous SUJIPIY of "'"ter at uniform rntc

b. To reduce •uctioo he<1d ..

~. To incre.'ISe th<> delivery bead

d. To reduce c.wlt .. tion

Centrifugal pump; have which of the following advantages'/

I. Low initio I cost

2. Compact. occup)'ing less llonr •r•ce 3. hasy hnndUng at' highly vlsoo1111 flmds

Select lht COO'el!t JUS\\'C1' '"'ing u.e code: srve:n below·

a.. t. 2 ""a 3 b. 1 ond2only

c. J llnd 3only d. 2 nnd 3orily

1\vo pump< can operate ind"Jlendently at hc•ds H,. B: • nd discharge O,. Q2. rcspcctlv~ly: 1f the pumps are counoot"d i..u pru'llllel, Uten whal "'" the resulting disdtarge ( ()) and head (H)'/

n. Q = Q,- Q,.. H = H.t + H1

38.

39,

.10.

42.

S nt 14 1>. Q =Q1 · \..!~. H = FI1 • H, c. Q Q1 • Q:,H ~ Ho • H, d. Q - q, + q, ll = lit ; l·h

Why i~ multi·$lll@ing in ot-'T\triJugal puruO$ u~ed?

•. for high now rille 1>. Por high head

c. Fur htgh spc<Jd

d. For lugh efticiency

C'on.~ider th.:c fnll()wing •tntem~nts to

re$JI<:Cl '>f Kaplau Tltrbine:

l . lt 1$ a reaction turbme. 2. fi ls n mi.w d flow turl>ine.

3. It h>s ;ldjusl>ble blade$.

Which of tho s llltcmotlls given above oro correct'/

a. 1. 2 and 3

b. 2 And 3 urdy

c. I 4lld 3 oul y d. I and 2 nnl)•

Which one o.J' the litllllwing is correct.?

If lhe numl)er of jets in ~ Pohron turbine ·,. oL then thespeciticspeed is ~~ . rt. Tl:

b. •-< n

c. •t. 0 ttl

d. independent of n Which one of tbe tollowins is correct'/ A turbine pump is bMic:~lly D c<:ntrifttgol

pump equipped additionnlly With

a. backward culvcd blades

b. vuned dill'u,ion e:t.~i.ug

c. inlet guide blades

d. adjustable blades

\Vha1 dOCll Euler's equa1ion of turhn ona.:hin"'' o'(:lute lll 1 a. Discharge and power b. Discharge and veif,cily c. Head ond power d . llt:ad and w locity

\\lltidt one of lbe litllowing is correct?

A uydt~ulic c~upling

a, connecls two shafu rotating al nboui ~to <>mo speed

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46.

47.

4N.

h. connect~ two sl••fts running ut different <tJ=ls

c. is used to ougmenl the torque to lhe driwn sh<~ft

d. is used to connect the centritugal pump and it.q clcetrkal lllt)tuJ li.r ctJidcnt opera linn

Why"'" •urg~ taukl; used in • pipe lilte'l a. To reduce jj ic:tiooal loss iu pipe

b. To """""' UJliform t1ow in pipe c. To relieve the pres~ure due to water

hammer

d. To reduce cavitation Which one of the following is correct'/ Water·tui1C boilers are prcfC:rn:d lo r a. high pres•nre and high output

b. hi!!h pre"' "'" and low output c. low preosure ond high output

d. low preosur~ ond lo\\ output

Wllioh one oftltc foUowiug is cotroct1 for tn~omprt:>sibl~ flow • di' erging SO<ltion acts as 3 diffuser for upsl~m Jlow which 1~

u. ~ub~onic only b. superi>Qnic only

c. ht1lh subsonic. nnd 1n1penwnic d. ~t111 ic

Given_

.,, ~stage eiTicicncy

.,, = nozz.le efficiency l'Jt, - hlodo cll:ictcncy.

\Vhich one of the foUowing is ccn·•ct?

n. 'lo ; 'lnlOo

I> 1'\h = .,,.,,

c. ·~· X 'l> X , • = I d. '1• l'Jb fin

Which oou uf the lo llowm!l I)'Tl<:-< of impcllcrvanc..s nt'C: r.r'&os-1 COiut.rionly u~cd in cenlrifug:tl type compn:sstl0<7 :L~ ForwMd .:urved

b. Radi:JI c..- Uaukwartl curved

u. 'ftl11genu~1

A c-enlnfugal compressor 1• sul~•ble for wbi~h oftl1e foUowing? n. High prcssun: rati<.l. htW m£Jss Jlow

jO,

Sl.

52

53.

54.

6 ul IJ b. Luw pressure rl'1io~ low mass

J1ow e; High llte&sure rntio, high mass flow

d. Low pre~<.Sure rolio. l•lsl> mass flow Which one of the following u C<ltTect? In ide:Jl regener.Hi\le cycle I he tempernmre of ste.1m entering tl1e lmbine is same as that of a, wate1 entering llte tmh.iue.

b. Willer lc;av~ng lh" turbine e; r;team Iewing U1e turbine

d. water at -any secllon of' the turbine

\Vlti~lt one of Ute following io correct? In A

&•• turbin<>cycle with regeneration.

a. pressure ratio incre.1scs

b. " 'ork output docreoscs

""" thea mal ~ffici"t-ncy lncrcasQ d. h""l i.opol iucr.:ases C•m~idcr •he foll•1wing otalc:menl~ IICrt.\Jning LO spocifit $poed or turbO machines: L Sp<:!Olilic $po¢d v•rieo~ \l·iU1 $Mpe oflh<~

runner :tnd oll•er p011s of tb~ m~chinc.

2 Machines with hi.!lhen specific speeds ore lrmil:ed to low he.1d•.

3. Specific speed i• t;limen•innless on1l I R inderendent of van31iun ()t' rype of fluid used.

Which of the s tatements given ahove nre corrtlct'l

a. I. 2 and 3

b. I oml 2unl~

C·. 2 and 3 only

d. I and :; only

In which oue of ll1c following pn>ccssc;o~. in a dosed sy•tem lhe lh•=•l energy transli:JTed I t) a ga.< i• completely ccn,·ertod to int.emal energy resulting in an increMc in go~ tempCTillure?

a. lsochoric proc~&

b. Adiabatic prOI!t:!IS c. lsothormo l pi'I>C<:Ils

d. freeexp•l\<iou Which one uf the following <:.XJ>re'"es the rev~iblc wo•"' don~:c hy the system (•ttady flow · betwet::n sttlleo I and 2?

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36.

5&.

59

"· J p d•· I

b - J··dp I

2

~- J p "" I

! u. J vdp

1

llu: ch11nl!~ ln specific cntrupy of a system undergoing 01 roverslhlc proceu is given l>y So • S! fC, • Cy) Jot (V,I\"1).

1l1ls is valid for which one of tho tollowing'l

n. Adiabatic proce..s undergone by an ideal g••

b. l•othermal proce..s undergone by on ideal 8'"

c. Pol)~ropic procoss undo:rgone by • r<ml gus

d. Lsob;Jtic phase C!hlll\ge fl"om Liquid to vapour

Which one ofthv following is corn:ct7 Tlw spec.l:Jlc vniUJue uf \\1 lller when llonlcd from 0°C

.:L~ firgt increases :Utd tbeu decreases

b. fi.l'sl dcCI'Cascs and then Utc.ruascs I!, VICl'ellS''> SIC;odiJy

d. d...:reases ste.1dily Which on;o of tl~<• following is correct 'I At crilieol point tl1~ ~ntl••lp~· of vaporization i· a. dciiCII\lt:11t <In ltcli[>CI"illute onl~

b. maximum c:. ntioimum

<1. zen"J

Which one of tha following set of materials L< most commonly usiOd in .:atalytlc eonverl<:rs for Cl ,,ginos'l

n. Platinum. palladium ~nd rhodium

h. Pall~.tium. rhodium nncl mthcnium

c. Rhodium. nctheninm and platinnm

d Rcuhcnium, platinum nncl pollnclium C'oi1Ji i<IC1' the following:

Caruou

60.

62.

63,

Carbon-monoxide

Hydrogen, and

Sulphur

7 ol IJ

What is Ute amount of oxygen (in kg) '"quired for complete combustion of c:m:b one af the above respectiveli/

•. I. 8, 8/3. ~17

b. 4/7, I, 8, 813 c. 813. At1. s, l d. 8, L -i/7, 813

C'on~ider the f•1llowing nuclear fuels: l . Pull!> 2. um ~- uJJJ

4. Tb~n

What is the correct SctfU•11C~ of tltc abbw nucloa.r ·fuels in order of increasing hn lf life'l

a. 1-2-3-4 b. 1-3-2-<1

c. 2-4-3-1

d. ~1-2·3

Which one of the following statements Is com:cel The mass defoct L•

a. • chnroclt:ristic of certain elem<ml•

b. a term used to prove the re.lation<hip between mass and energy

c. a mta.sure ofti~s1on energy

d. the diJference between m>SS nl' 1hc nucleus and sum of the masses of tJ1c nucleons

Uranium 238 is represented by ,..u~'". What dOllS it represent?

~- 92 ueutnms and 238 pculuu~

b. 92 po'Olons and 23~ neutrons

c. 92neutruns and l46 pmtons

d. 1)2 prutons and I 46 neuo·ons

J'vlot.c:h List 1 with List U ond select the correct onswer using the code given below lists

List l

(1. -\\)

A. Fourier'• l.nw

B. Stefan B<> ltzmnru1 L•w C. Newtcm's Low nfCooliog

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66.

67.

D. Fick• 1-'lw List D

tEfiil<lt)

L MilS$ lrliW<ft1'

2. Couduction 3. Convection ~ . Rn<liatlon Code:

il. B c D

"· 3 2 4

b. 2 4 3 J <:. 3 4 2

d. 2 I ' ~ 4 rwo wall< of •arne thicknes~ "nd C(Q5S

sectional area.luwe thermal conductivities ln the l'lllio I: 2. lf same temperntur" diJ:Tcrcncc is maintainOO ncros$ the two tacC-< of both I he wall•, what is I he ratio of heal Onw Q11(Jz?

a. 11'2 b. 1

c. 2 d. 4

A lln of lcn&U> 1 protrudes from a .urfo<¢ held at tcmpetoturc'fo: It being higher thnn the ambient temperature 1', 'fbe heat dissipation from the free end of the lin is st:.tcd to be negligibl,l' IWlall \Vhal IS the

temperature g,.,dienl ( tll'_ ) ut the tip Jx x -1

of the !in'' n. l.ero

b, r0 r1 I

c:. '•(7'o- r. }

d. 11-T. To-t.

Which one of tho fi>llmving is conect? 11•c eO'ectivene.s nf :1 fin will lx: m>xil1lum in :to c::nviroument wilh a. free convecl-ion . h forced onnvec:tion

c. radi:ilion d. conv"c.tion and rndiat.ion

Co"" idl:t tho foUowing sllltements rolot~d lo the fluid pt<ltle>1ics:

68.

69.

70.

71.

1. Vapour pressure of woter at3 7:. K is 10 1.5 X 103 ~im1.

2. Capillary he>ght in em for water in contact with glass tube and air is (tube dia)/0.268.

3. Bh>1rd is a Ncwtcmian lluid.

Which of the st.atements given abo"' is/are Ctln'CCl?

a. 1 <lilly

b. 1 and .3

c. I and 2 d. 2 only

\Vltat '' the unit of dynomic vis~ooity of • 11uid tenned 'poiRe· equiv:ilentlo'' a. dynefcm!

b. gmslcm

C. i.lync ..s/CIU:

d. gm-CntJ'S

\V~at Is the r,....surc difll:n!nce hetwot:n inside ;~Dd outside of • druplct of 'Y•toJ'I

a. 2o/cl

b. 4<1/d c. ~old

d. 12old

where '<7' Is the surface tension ~nd ' d' I< U111 diamc!(lf of tl1c dropkt.

·n,e lower prrrtion of a V·tubc ol' unilorm bot<> having both limbs wrtical lnd open lo atmo~phcro, is initially ftlled with • liquid of spe.cific gmity 35 .. -\ lighter liquid ol' specific gt'3vity S U; lh"l! poured into one of lito limbs such thol U1c length of column of l.ightcr llq uid is X. What is the resulting movemen t of the mOliiscus of Ule. heavier liquid in U1c other limb?

a. X h. >112 C1 "Xt3

d. X.6 How is tbo cliffeJ'I!nce of pressure lu:ad, "h'• measured by a mercury-oil differential manometer expressed'!

. ll:+-tJ b. II - x[ Sg -Sn)

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74.

75.

c. /1 =.r[ s0 -S~ J

J. h =x[~~ -i] where ~ =manometer l'l!ading: s. nnd s~ aJ'd

01e ~pecilk grnvities of mercury und oil. TO>lJCCtivcly,

What is the venical '"'mpone111 of pt·essure Ioree on sttbmcrgcd curved ~urface equal h)'?

a. Its horizon to I comJ1<lnent

l!. lloe ""'"" Qn u vertical projetliuu of dle curved surf nee

c. 01e product of the pressure at centroid and surfaoo area

d. llle t!fuvily li:lrce uf liquid vertJcllll> nll\wc the cotrved surface up to the free s:urfhce

What is tl1e depth oJ centre uf pressure or u vertical immersed SI,Jrfoce rrt)IH frue surlitceo rl lqutd equal to1

a. lr; --:b .. , llh

b. 'r'' -......!.-+ It /r

c. 1, )i I --~ t

A

Ah -d. --h ,, . (Symbols have their ""'" I meaning) Wlint is buoyant ti>rce? a Latetal force acting on u submerged

body b. Rcs~)lnnt fNa: acting on a submerged

bod)

c. Resultant force due to water on a bod~ d. R~sultnnt hydroStatic force on u bod>

due ill fluid surrounding il I low is Ute metuceruric expressed'! heigl>t. GM a, OM = Bl).(IIV)

b. GM = (V/1)· BG

c. GM = UIV)· OG d. GM = Llli- (VII)

•1 nf I I wbertl I = Momo:ul of inertia of tloe pfllll o f the floating body Ul the 1\'Uter surfue<> V ~ Volume of the hotly ,ubmergetl in \\'Lit~:r

BG ~ l)i~tance between the c.:mre of gravity (G) and the centre or buoyancy (13).

76. Stability \If a Ooating I>QJy can be Improved by wbich oft he lollowing'l

1. Mnk.ing its width large 2. Making the dral\ small 3. Keeping th~ centre of mass low -1. Reducing i1s dcn~ity Sel~cl tlte correct answer usiug the code given below a. I, 2. 3 tmd 4

b. I, 2 und J onl} c. 1 and 2 only d. 3 nnd 4 only

77. fhe distance fmm tl1c centre of buoyancy to tloe meta-centre is given by UV •· where V, is thu volume of lluicl dispi&L'Cci Whut does I represent?

78.

79.

n. Moment of inertin of u horizoorul section of tltt hody tal..cn at the surfac<> nflhe lluid

b. Moment or inenin about irs venicu1 ceuiJ'oidal "'' i~

c, Polar moment of inertia

d. Moment of inertia llbout its horizoniul cenu-oidal axi~

What acceleration would cause the free storfacc of a liquid contained in an upcn tnnk moving. in a horizontal track to din by 45°'.' a. g/2 b. lg c. g

d. (312lg

ll /= ~ Td

lodl5'h -Tite tcmpet"ature distributiou curve lor u heat cxcJoungcr a.~ shnwn in the figure

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nhove (with U5 \L11 nototions.) refen< to which ont of tht lilllowjng?

• · Tubul~r parallel flow heot a.xchanger b. Tube in ntbe ~untcr tlo" he..t

e.xchanger

c. Boller d. Condenser

R(l. llte 'l'iTU' (Nuntbcr of TmnsiC. llnits) in a he:.t l!l(changer is given hy which nne of th~ lhllowing?

••

b. U.-1

c,""" e. UJI -

£

d. ('mnx

C miu

A Heal u~hango nrcn

l1 Owra U Ileal transfer cocffici.ut C- I loot capudty

E = F ll'ect iveness

A sphere. a cube and • thin circular pbte. all n1ade oJ same moateri.!\l and havmg s:une roM• •re initi•lly lteot.:d to o LL'tllpi!rowr• of 250° C •nd then lo;:tl in o ir •t room l~mperanrre for cooling. Then. whtch f>n" Ill' the l'ollnwing is corrcet?

" · All will be cooled otlhesame rntc b. Circular plate will be coo led at lowest

J'3te

c. Sphcn: "ill be c•mlcd f'aster d, Cube wi II be cooled Ji!•ter ihan sphere

but slower tliJio drcular pi:Ue

Naturnl convection heat tran.~fer coefficients over surfac~t of a vertical ptp<: nnd Ycrticnl tlot pblc for same hdgJ11 and tluid aro equnl. What t••nre the possibl<> reasons r or lb is'/ I Some heil!)tt 2. Both vertical

3. Same tluid 4. Same lluic! now paU.cm S~Joel lh~ CO~l answer U>ing the t:(ldo given btlo\v tl. l only

83.

b. 111Tld 2 c. 3 and 4

ll 4 only

IOntlo

S~urudt number i> ratio uJ' wlticlt or the following? a. Product of D'IJISS !ran!f~r coeffic[ont

•net diameter to diffusiVity of fluid

b. Kinem:tlic \'iscmity to. l ll<nnnl dit'fusivity M. fluid

c.. Kinemalio viscosity IO dillU.ion '"'efficient of fluid

d. Thermo I d ifft•• ivity tn diffusion weflicienl of fluid

84. What t< the equivalent emis$ivity far t"dinol h~l e~changc bet\\ cc11 V a V ~n••ll bod) (cmi•sivity - O..t') in n very large cttci()O)tu·e (emi••ivity - Q.S )?

85.

86.

$1.

a. 0.5

b. 0.4 (!, 0.2

d. U.l

The he..t exchange between a small body having erniS$ivity e1 ~md Mea At and a l!lr_ge entlosure having emi..,.sivity ~c:: and ""'" A1 i; giv"n by:

'II-: ; -ltEtcr( Tj1 T~) Whol is the ns.umplion for Ibis ec1uoliotl'l

a, &r t

b. , = () c . ,.\ 1 is v<;ry ~m:tll a~ (.'tunpnred hl Ai d. SmaU bcxly i• !II cenU'e of cnclo!ure

For oimpl" \'npour llOtupn>o~ion cycll!, cntho lpy •l suclioo • 1600 kJikg. \ ' enUtalpy ot· discharge from the <-ompre5sor 1800 kJikg, entl13!py nt d~il from condcruor - 600 kJikg. What is llic COP ror this rerrigerntion cycle? n . '' ..........

b. 5.0

"' 4 d. 45 Motoh List I with List II ond sel""t the com~<!! 3nswer using tlte code given below lh.; list~ :

l, ist-l (Cycle)

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91.

A. Air relrigerotion

B. V npour compression refrigeration

C. Y •pour ab>orption r~iser•lion

D. Stoam jet rofrigcmtion List-11

(Equipment)

L Al>.~orber

2 , r tosh cltamlx:r

3. Tilt'binc -1. Compr·cs~OI'

Cod~:

1\ B a, ~ 2 b. 4 ~. ~ •I d. I 2

Whllt is an azeotrope1

c

3

3

D 4 2

2

" II, A non-ltalogcnic rdrigeranl

h. A reliiger-•nt dissolved in olcohol

c, A mixture of refngernnt. without phase sep•rntion

d. An oco-frienclly refriger:tnl Which one of the following is correct'/ Environmental prote.:uoo a~ncies advise agoln.-t the. use of chlorofluoroc11tb011 refrigcront.s bec:Juse these rcoct with

n. wnler vapour and caUse :tcid rniu h. plants and cau.,e green bouse elfcct

c, oxygen and cause its depletion

d. O?..One byer and c•u~e iL• depletion

What is hunting of lhemwstntic exp:rns iun valve:'? a. A variation of evaporator load with

degree of super heat b. A vonallon in prcssurc M lhu

cV.tt>Ornwr with vari:ltion o.f'load

c. Alt.:mate O\''erfccding ond stan•iiJ~ of I'Cfrigoo·•ul Oow ID the evapor:tlor

u. Tltis is nut used iu ~oom~ctiou with ...:xp:m.sion v:slvc:

Ou • psycbromclric "bart. what doos a vcttic•l downwnrd line represent? a, Adiabatic s-aturalion

b. Sm•iblo cooling

c. Ddt um i tlitic:lt iuu

d. Humidification

93.

94.

95.

11 ul IJ Which of the folio wing properties decreasc(s) wiolt •cn~ihl" hcatinl! of air­water vapour milaure?

I. Relauve humidity

2. Humidit} ratio

3, Specific enthalpy of nir-vapour mi.\'ture

4. \Vet bulb l<mperature

Select the correct answer tilling the c11de given l>tlnw

a. I only

b. 1 and 3

c. 2and 3

d. 2aud 4

CoMider the fo llowing sttto:ments regarding psydnomctJic proccs~es :

L Sensible healing i• a process in \VhiciL moi"hsrc content remnius unch!lngc..>d.

2. In the dchuntidification proc<M< ~tc dew point temper:~rure remain.$ Jame.

3, The proces~ of nddins moJ:~ture at conslllnt Jry bulb tempernmre is known D$ pure I 111m iditkation procos..

Which of the statements given ~hove i$/3l'c con·ect? a. I aud2

b. I and 3 c. 2 aud :< d. 1 only

Con!idc-rthe fullo1• iltg sL'lent~-nL>'

Jn • P•Ychromclric chart

I. vcru~J UnilS indicate W<t bulb tt."lrtptJta turc~

2. borizooLol lin<:l! indicate. rd~livc

humjdit)'.

3. scttsiblc b~aling o•· cooliJJ!! is· r<lpn:sooted by ap inclined Line.

'\Vhich of tl1c stntements eivcn above is/3J·c. cQn·ect'l ...

a, I only b. 2 o11ly

c. 3 ~mly

<l I, 2 ani) 3

Which one of lhe ti>llowin2 is cor'recl? During "''""iblc ""uliug of ;;,oist air. its rolativc hUimdity a, ittCt&!ru,es

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97

98.

99.

h. daes not change

c. dcet'eases

d. affects >lldCifie humidity Whiclt gas pow<:r .:yclt ~;on~i~~~ ol four proceMCl> during which work alone i~

trunsfem:d during two processe! and heM alone is transferred during the otl1er two proc...,..,;'l

•• Atkinson cycle

b. ('.arnot cycle

"' Diesel cyde

d. ONo cycle 11te llllction prc:ssure ;, l bllr and deliv.,.~ pn:.<~sure is J 2S bM. Whnt i• the ide.~ I intcnncdiat.c prcssur'e nt th.: end or lil'$t ~tagu for~ J .. slit!!c :tir compressor?

a. 25 bar

h. 5 l><rr c. IUhar

tL 20 har

In a Sf ongiotc. comb~tion stage f takes I ms and combustion stllge 11 ta~-es 1.5 m~ when tloc engine run$ al I 00() IJlni. If •tagc T time duo.,tion i• indcpendont uf engine •peed what will be the additinnal ~p•rk :odv,mce neco;snry when lh~ engine •peed i• doubled?

n" 0" h. 6° c. 12'

d. 24"

Fot minimizing kootk:in.g tendency is Sl engine. where should the space plug ba located? ~1 , Near inlet valve b. Aw3y &ant both tJ•c va_lvc:s

.:. N enr cxh• us t v a.lve d. Midway beiW<:t.'O Inlet and c.xll•~t

v:~lvc~

1()1), 11oc Uucc way caulytic conl'ortur ""-nllOt conttol which one of ll1e follow in&?

"· HC enu•si~n

b. co cmi~siun

"· NOx emission d. PM=issioll

10 I. Oxide• of niU'Ogen in the engine e.W\ISt can be reduced by wh;c.h of the foliDwing m<Utods'?

1. Decrease in compre-.ion nttio

2. E.·ihaust gas 1-eciNulalion

3. Usc of~·~ l~an nti.XIllfl: 4. U~c of oxidation catAlysts in "'!(JwuJ;t

m~nifold

Scltct th~ con ecl ons,,_or ll.'iing tlte oode given below: a. I and 2 unly

b. 1 and 3 only

c L 2and-l d. 2 ;md 4 only

102.. IVhieh one of the following is correct'/ A nucle:Jr r~ctor is snid to he critical when the nemron pCl(lulotion m the re<telflf core is a. rapidly increosing leading to the point

of ""plosiou b. dc'Creasb1g from • weciljc va luo

c, reduced to :z,:rn d. constant

I 03 ln an expetimen~ the following •henr stress-time rote or she.1f Mira in values are obtained f9t a lluid: Tim~ rote of shear : ll 2 3 -1 strain (lis)

S hear strei<~ (kP.o) : I) I ,4 2.6 ~

Jlcm corolhe IJuid b<>clos•ili•d7

a. No" tt>nian fluid

b. Bingham plnstic

c, l'•eudo 1•l••l ic d. OUotant

104. .\ gM turbine pl:mt working on Joule cycl~ produc.cs 4()()() I. \V uf powoo·. If iL< wort. rttlt<) i~ 40"'o, wloat is tho 1>uwcr ctno•ur'ol"d by lloc corrlJ>r<>ssor? a. 2000 kW

b. 4000 kW

c, (j(~ikW

d. 8()(~1 kW

105. What is tho ratiQ of the <tatic enthalpy rise in tbe rotor to the static dllthalpy 1-ise in Ute stng~ of an oxiol flow oompressor defined as'l

Jl . Po'~ cr iJiput fitetor b. Flow eoeflki<nl

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c. TemperMure cod'lictenl

d. Degree of reaction 106. Titc volute c~siog of a ccnlrifugul pump

hM whicb of !he following fitnctions7 J, Eliminating los• ofb~;~~d due IQ ~hange

in velocity nflor exit from impeller. 2. Dircclll tl1e !low low ords tl1c delivery

]>ipe 3. rnnve11s u J>:lr1 of the ve1ocit) head 1n

p~sun: lwatl 4. Give< • constant velocity of flow Select t-he correct :~nswer using U1e C()da­given below:

a. 1.2:md.l b. 2 ond 3 only c. 1 ond 4 only <l 2 nod ~- on ly

107. Wlti~b '""'of the tilUowiug stat(>tuenll! i• not corJ\:cl in respect of b_vdrau~c. turbine~?

"' (Speod) is proportional to (I !Diameter) b (Power) i~ proportion• Ito (Spc-edl c. (Pol\«) is ptllportionalto (Fleodt-''Z

tl. (Spcetl) is proportiopallo (Head{' I OS. A v"locity focld ill given by u = 3xy und

1• = %( x2 - )'!}. What Is Ute relcvam

equation of a stro•mtine'1

dr (-•~ J': ) • . - = "---"-

dy ,\)'

cl< (.~ -i) d. - -: -'---"-

ely Ll)'

109 For sle;,dy lnoompreuibl~ flow. if the o-uonlpom ... "nt of \'Ciocity i.s u Ac <_ t.hun what is tho v-coniponent of velocity?

>. A<! h. A c>/)1 c. -Aey d. -Ac'

13oll4 l HI. An incOm]ll'eliAiblc fluid liow•

radiaiJy outward from a W.e sour<:<: in • stead) matmer. llQ" doe!l tho velocity in any radial direction vary'/ a. r

b. ~ c. 1/r;

d. 1/r

II I C'onsider the li•Jio" ing st3tcments:

1. The friction foetor in laminar flow through pipe« ;. independent of roughness.

2. The friction fuctor for laminar flow through pipes is directly proportional to Reynolds number.

3. rlt fully turbukul !low. through pilles. friction f.•ctor i• indep.,dent of Reynold< numbor.

\Vhkh of the statements given abo,·e are corrwt1

3 . I. 2 und 3 b. land 3 only c. 2 and 3 only

d. 1 and 2 uuly

112. What is bydl'aulic diru.neter used in place of diameteo· for non-circular ducts cqual to'/ a, N m

b. 4Aim

c. ,\,(4m)

d. -lm/A

where .-\ ~· of tlO\\ and m = perim.oter.

113. The velocity distrihulion in a htrbulonl botondary laJer is given by u!U : (y/of' Whot •~ Llle displacement tlticknes< r.··1

a. o b. 0/7 0:. ( 718) ii

d. 6/8

114. For h_vdr.tulical ly most tlfidonl symmetric lrap.,zuicwl sc'Ctiun uf an 11pcn c.b~nncl, which une of Ute li>Uowing is the f•l•c ch.arnclcriz.1tion?

a. \Vetted perimeter is minimum for a g..ive:n 3re.:1 of flow ,;edion

b. l·lydraullc radius U. halt'lhe flow depth

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c, Width at top liquid is twice the hydraulic. depOt

d. Discharge Is ma"imum for given •rea of flow, bod slope ~nd roughness

liS. l'he p<lWer ~nsumcd per unit length ln lnm imar now for u.e same discharge. varies directly •• D" where D i> Ute dinrncter of the (lipe. \1/h:\t i~ thcvnlue or·n'? OL lf2_ b. ·1•2 ~. ·2 d. -1

tJO. l'he velocil)' profile m a laminar boundary layer i.' given by ull' = Yr6. The ratio of momentum tbicln<:ss to dL.placcment thickness for tb~: boundAry is given by whic.h on<: of the lollowinJf' n. 2:3 b. I : 2 c. l ! 6

d. 1 ! 3 117. 1\lntcb L-ist J wiUo Li•t U and selec:l tloe

con-eot answer using Ute code given belo11 the lists:

118

Listl

CV ru'inblt:J

A. Dyn~nlic. \'iscosil)'

B. Mamcnl ul' momentum

C. Power D, Volume mocluln.< of elasticity T. ist n (Oiruemionol Expression)

L MI} T 3

z. 1\.0.:'r' :l . ML''T'' 4. MI.'T' 3. Ml? f't Code:

A. 13 c •• 4 2

h. ·' 5 l

c. 5 2 d 3 4 Mnldt List l wiUt Li$l Ll

D 3

2 .:;

2

und select the corre<:l on$wer ustng tho> code given ~elow uu~ lists .

List r (Dimen•ioni<Silnumbcr)

A. EuleJ· number

B. Weber uutnber

C. Ma~h number

D. l'roude numher

l.ist II

(Notur" of fon:es mvolved)

1. SudDcc lt: tt.~iou 2. Grcovity

3. Pn:ssure 4. F.laslic

('ode;

A

•• :l b. 3

~- 4

d. 4

H

4

2

('

4

l

2

l

I I nt 14

()

2

2

3 • ·'

I 19 \Vhkh one of the following is correct'/

In a nomtal shock waYe in one dimensiun:ll now u. th~ enlrQpy remui"" con"unt

h. the entropy increases -across the shoc"k

c. tlte entropy decreoscs across the shod<

d. tile velocity. prt8sure und density Increase a eros~ the shock

1'2(). Con.•ider the following <lnlomcmts for compressible t1ow through a vnrying ore.1 passage: I . For • convergent no?.zle. if lite exit

pl'eSSure i.~ l<:s> Utan ctitic:aL external flow wiU not be iscniJ'OJ>iQ.

2. Supcl'!lonic-.ubsouic • diJfus~'t' would nppenr similar lo nozzle •nd works without irreversibility.

Which of tho slotemcnts giV'l."rr abo\'e is/are COm:<:-t'l

a. I only

b. 2orily

c. Both 1 ond 2

d. Neitb~r 1 nor 2

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l .E.S- (OBJ ) 20118 I ol I I

MECHANICAL ENGINEERING J

I.

2.

3.

.I

5,

6

PAPER·II \Viwt is the ndditlooal tuuc: nv:•llnbli.: for the ·pcrfonl!ancc. of nn acthity in PERT and CPM culculatcd on the basis tl•ul nlJ uctivltits "ill stan allhcir earliest sllu't rime. cnllcd1 a. Slack b. T otnlllo3t c. Frtc noaL d. independent lloat In the basic EOQ rnodcL if demand is 6U per month. ordering cosl is Rs. 12 per orde-r. holding cost is R$. I U per unil per month. wh.al is 01e EOQ'/ a. 12 b. 14.1 c 14 d. 28 W11ie-h one of the (bllo\\lng. is correct'! ln tile basic EOQ model. if lead rime increases from 5 to 10 day$. 01e EOQ will n. double b. decrease by n foetor of' two c. rcnlnin lhc same d. The data is insutr.cientto fmd EOQ \Vhjch ooc of the following stmements is not COITC(;.l

n. Work sruupling is n 1cchuiquc or "ork mcasurcnteut

b. McUHxl study is a tcclUiiquc aimed >u evolving improved methods.

c. Symhctic dala is not u tecluuquc oovcrcd under pre-determined motion time systems

d. 'Select' is the first step ofmetl1od study A time standard for a data Clltl') clerk is to be set A job is mtcd ot 120 percent. it utkcs 30 sctonds to enter each rec.ord and lhe uUowauccs un: l5%, 'Vhat is 1.ho oommJ time'! n. 25 seconds b. 30 seconds c. 36 seconds d. 40 seconds Which one of the foUowmg s tatements is not correct? a . 'fhc operating chnroc1ensrio c.unc of an

acceptance sampling plan shO\\ s ~be abllit~ or the plan to distingmsh bell\ een good and bad lots

h No sampling plan cnn g1vc corhpletc pn.necrion +Jgainst 1he acccpumce or defective products.

c. C chan has srrnighl line limits and U ohart has L.ig·zog l imits~

7.

').

10.

d. Double .s11mpllng results iu 1110I't

itlspcctiou than single stlutpling if lhc incoming quality is vcr.v bad

Which one of llte folio'' utg statemems is nol correct"! n. A linear progrontniin~ problem \\ ith 2

vadables nnd 3 constrnims can be solved by Graphical Method.

b. In blg·M method if the artificial l'ariable can nol be driven 001 it depicts an optimnl solution.

c . Duo I of o dual is the primal problem. d. For nli:-<cd constraints either big-M

method or two phase method cnn be. employed,

In Order for 11 tmnsJ)()nation maJrh \rhich has six rows and four columns not to de~tanerate. whal is the number of <>ccupied celled in the. matrix'? a. c; b, II c. 15 d. 24 Lu a smglc sen•cr queuing system with nrnvnl rnte of ·J: nnd mcun .service cirnc of.,.._ the ~~pectcd 11Utllbcl' of CUSIOIUCrs 1n the ~SICIH is

-l {.11 -J.) ' Whm ls the- ex-pected wnit.ing_ tiiUc por CUSIQJlll:lf in L11c S)' Stcm?

"· b.

<>.

d.

Al (p .l) p -J.

I

11-J (p- ~)

A Matcb List·l with list·fl and ·select the cor~t <1n.swcr using t1H! code gh en beJow Lhe lists: LISI•I {CQmpoiiC!IIS) A, Control unit B. Aridnuetic unit C. Memory D. Output del'icc List:a (Fu11ctioos)

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13.

H

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lo.

l.og•cr.l checks and cniculal>ons ~ Stores LDstnu .. 'l.lons and.Jal8 3 \ onYOrl$ remdL .. nd pfi:Sen\5 tfl tho user J ( 'nnvcrl.s rnstrudlons M cutles "· R(:ll;ll.."fVe:s 1nsLrucuoru. and p~r ti"'rm"'

operauMs. C'oJ.c

A B C' D a 1 I l1. 3 ~ 5 3 2 I c l 3 4 I ~- 5 I ~ 3 The \.en1r~l Pror.e:ssmg Uni' nf =t mm1 computers u.•es which oi' ~.e fc>li<IWlll!\ blnck..: 1 Memory UmL 2 Control Umt 3. Anthmeti~ lJmt -1 Outptrt Unil Sclttt the COI1tCI IUISWet USIJl!l the .:ode ~IV<:D O.lm.-a. l .u~cl z b l will 3 " 2 lind 3 J, I lllld 4 Whtch ono of tho fol lowing_ 51atements abol!l f'OR'n~N w nnl correc<? " GOT0999 b r"ON'lTNUE 099 c. J>RJNT 999 d. DlMENSION A (999) Bouom gating syol¢m IS $t)m<Um"" prtrcrroa m ~5lmg because

" it en11bl"" mp1d tilling Qf moald "'""'" b it ,. t-..ler to ptov•dt 1n the moulll c- it provides clenncr metal J. il reduces >t>la>;hinll and turbulence The paU.crn odoptcd fur tho"" o<lSttog5 where there are some J>Qrtum~ \Vh1ch · llrC strucluraiJy v.<ak and ore hkety to break bv U.~ [IJrec of 111mming are en Hod • Loose P'"'" 11auern b. l'ollow bi.1md pallcm c Sl."elton paltem J. Single pic~c poucm Wb1ch of the lollawmg ooslmg prooes""" does not/do not requite ct:ntrnl core for prodtlcmg ptp<7 I Sand C<l.~lmg ptilo¢;:s 2 D tc cusLLog rr'Mcss " Centrifugral castmg prf'Ces3 SclccL ~ cotti!Gl Ans\Ver using the C:C)dc: given. below" • landl b :! only c land3 ~ 3 only rf ormOOI piilh of 14 pfOjl"C:t IS 1U munths With " sland•rd derwauve 4 m~11tl\<, WhM t~ 1he

"2 of11 prOO.bi hty that the proJeol m il be completed m 2-tmoth:<'! • 1585°, b 68.3 "• C: 84.2 o.,; d 95~0%

17 O>mm<>n contacl 1'3110 vJ'. Pillf or "f'UI pllllon and g(!.lr JS

a. Less l~an I fl b <<jUIIIto 1

'" OOtw~ ~ ;an"1 3 tl. !ft e,atet !.han 3

IS In Cll'"' of om p dtsc ~ luloh if n, is w numberordi,.,iau l hedrivmg-slllll\ •nd n, is lh<> nun>b<r of disc• nn the driven &ba 11, ll>on whst is the number of pain or con~'ICl surface<? a. na ~ n,

\1 "' T "' - I c n1 + n:, T l d " ' ~2n ..

I~ F<>r rttlltr cham dnw \Vtth ~pmtke< h•v•og W toM the l'cl,'City of lbc drivon tball wnh respec11n lh;,t nf dnve wdl be ilpprmum>tely -n same b 5~u above to :5% below c 5a. ... ah()ve d. Jx,Jo\v

~(l Which of 10. lollowmg m-Ime euaines working on lour-stroke cycl~ •~ completely balnnccd mhen .. 'tltl\''~ a. 1 cylinder engl!le b 3 cylinder ongtnc c, .i cylinder engme J. <i cylinda tngint Mnlch I..Jst·f m th 1.\SI-D .00 •elect I he <<'mlCl

atti;wet us in~ lhe codet?i' en below ill< hsts List-1 (l:.ey.;.-phne) B. Gib hoaJ kcv C. \Voudruffk<y D. Parallel key E. Splu\o L.ist-11 (Apphoation) I Self nbgmng _2 fuct1nm..._-s rcmovul 3 Mostly used 4 Axial m<>V<m<:nl fl'lSSJble Cndc:

A B C I) a ! 3 4 b z 4 3 c 3 4 d l 4 3

21 liight bnhs lire "' be selec':led fur f1xmg tit< ¢1)\'"' plat~ ol' a cyllncleo subJc¢1o:<i w • maxunum load of 980 175 l N. If 1he d""ign " res.< ti:>f the bolt m;ucn~l •• 31' N mml. what is lhe diAml'lL"f of c:.ach boll?

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n 10 mm b. 22mm c. 30 nun l.L 36mm Coru;idcr thu follo:n\1Ill! •~<~•~. I 'nle am<',unl •lf -tntetferencc needed tu

cr""'" a ~ght jomt van.:< wilh o.liOJllc-tcr oJ the shaft

2.. An int.eJti.Yeoce fie creates no $lles5 s1ote tn the shaft

3 The SITOS.< SIMe m c~e hub is <im1lar en ,, thick-w .. JJcd (lVIuldtJ wi~1 intcrnJll pressure

V.'JiiCh or \l)e :ltRtemonl$ IJ.TV<rl llh<l\" are correct" • I.:: and 3 b. l and 2 only c. 2 and 3 only J. l md 3 onlv Coll!lidcr lh~ fQllowmg .•tdtomcnto: A nomenclarure <fPU IWr~ den('(.:s t.Mt I bole dllm.tclc!r IS 50 mm. 2. It is a !'haft base sys1.em, 3. 8 1nd1C11tes fundumentol d<'Vturion. \J.'hich of thl! st.at~mcru$ l!iven ubm~ i.!W'are correct"' .... u.. l. 2 and .3 b I ;111d 2 only e. 1Md3mlv d 3onlr f'on.<~der lhe followm~ · V -belts arc spcci.fioo h:y thcir I nomm•l tn'!lde !otlgiJl 1n mm J. noulmal p!lch length 3 bell ems.• '""lion ")'mho! 4 WG>ghti\Jrut length oi tht ""It \\'hicb oflhc 1\bn\'c: nt1! co,rec:t? o l,2.lond4 b 1 and 2 onl)' ~- I and 3 nnl) d 3 Md 4 <lnly Cousldc.r the foJiowin~ .!J:taiomcnts' ~.foxmmm r.hear -'itt~ induced ~ m u rower trnltMl.ILttng sh,,tt I• I din:ctly propmllonol to tnrquc oomg

transmiuOO. ~. mwrsdy proponlonal to the uube of ,,_.

dJ;amdler J. directly prop<>ruonul to ill!- pJia1 momcrtt

otmeni:t , \Vhith of tho $lot<tncnts !!JVa> above arc c:orn:ct'l fl l.land .3 b 1 ond > unly ¢ l And } only <I I ""tl 2 nnlv Mitximult'l shi."Af str~ iii ts .1\:(ah( s C.trdc-" i• equnl to rndius ufMohr' • circle b. i.s _gll!&tcr tb4D raditb of}..1obJ .. s ctrclt

~7

2&

J(l

31

33

3 of 11 c IS less Lbnn nKillL' of Mohr'< circle d. could b~aoy oftht ubove Ma•umurn deileclion of • c:mulewr bC!IDI nf length I <mymg uruformly tltStnbutc<l load w p.;r urut length ,.,u be a lVI' lEI) b WI' (4 1il) c. WI'' (~ Ill} d WI' (384 El) JWhcru R,.. modu1u• of dr~~tigir)• oflsflm m.1hrri'lll md I !Mfttent o(hlft'~Lt orl'IC!".ws t:l-,_'lft~6..ti011l)

ln l~ecuon 1:.1' u beam .stlbJect.:<.l to tnnsversc­shear 10rce. tltc ma:timum shear sll t!S8 tS d<wloped a. at the ctnlrcofth~ Web b •• tbo t~p edge nf the '"P Jl1111g• c '"the bouom edge of the top llange d None oftb~ ltbov~ f.n case t~f A be.tn1 of' QltCUIAt CrQS.,~·SecliOD sul!jected to trMsve<l!' ln3dtll& ch• maxutlwn sbeur -iilte!ol.S dcvel~ed in the beam is gre..uer lll<ln tho awn~ •hoar •tress by a. ~o b 33% e. ~~o

d If>% A structur•l membor •ubJCCL<d to on ""'"I ¢omprcsslVI: t'o<oo LS collod • beam b column c. fr-.mc d. strut Suuct w·c of a poly mer i.s a. Long cham b RhombiC a Cub1c d f' losed pa<:l hex•gonal Consider tht foUuwinl! stah!tnt!nh •

I Mellll Ji>mllng d;;.reases ha~n1 l ell~ of impuriti~ und improves meclmnlelll 5lr<1l!!Lh

2. M<ta l wndu~ pt<>Ct:l!S IS a pl•;.'tiC dcoormahon pr<X~css

3 V«y tn trtC3IC shupc$ ten b¢ produc:¢d by forg1ng proc.: .. u.. eomp~.red "' c.,~g pnx ....

Wltich of the: sta\"<3menL<> gwen above ~re CQtri!Ct? a 1 2and3 b. I Jllld 2 on ly c 2 and 3 on!) d l • nd 3 nnlr l\1II(cb I..!Si-1 with List,ll 11M •<ltct Lho correct an~wer lt<lnl! the code g1ven below the hS1s L ist -! \rorjpng T.,hmqw) A. Smllh 1'\lrgong B. Dror Forgms C' l'ress Forgmg D. Mochmc Forgmg

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35.

36.

37.

38_,_

39.

l, osl-11 tl'roccss\ 1. Motcriol i• onl)' upset to get the desirotl

shope ~. C:liTied Olll IIUUIU3ily in unen ~t ies

3. Pone in clo'"'d impro:ssioo dies by l1ammers Ju bJo,vs

4. Done. in t!lusc<J impression dies by continuou!' sqi.U!eziog, force

Code.•: A B C D

a. 2 3 4 I ~ 4 3 l I c. 2 4 3 LL 4 2 3 A cylind1ical vessel with Oat lx>Hom c.flll be dcop drawn b) ol. shallow drawing b~ single actioo deep dnt\\~ng c. double action deep dmwing d, 1riple: ::action de!.!!p drawing Which one of the following methods is used for the maoufatmre of oollapsible toolhpasll! tuhes'! ~ Impact extrusion b. Oirec1 ext'ttLSion c. ~Jeep drawing d. Piercing Small amount vi catbonaceous matcrfal sprink:k-d 01.1 I he inner surf:1ce or mnul(l cuvi1y 1s cal led u. Backing saud b. Facin~ sand c. Green sand d. Dry S(md In ~1utomobfJcs. Hook. ·s joint is u.scd betw..:cn which of the ft,llowing? a. Clutch and gear box b. Gear box and diffcr<mrial c. DifJf.renJial aod Wbl~ls

d. Flywheel and clutch In a llul bc.lt drive Ule bc.lt can be subjooled lo a ma).;mum ten!:IOn T and centrifugal lension i'L- \\'hn1 i.s the oondition f"r u·ao<llJission oF maximum power'.' a. T = Tc

b. T= .{3 T,

<. T = 2Tr d~ T = 3Tt A shali is ~ubjcctcd to l'Ombincd twisting moment T and bending moment M. Wha1 ls the ~.:quivalcnl bcuding momcnl?

a. v, (JM1 +T2} h. JM1+7'1

~ . \1, ~ M + "'',\ .. -=(1,..-+-T-=-2 }

4H.

42.

43.

I uf I I

d. M + JM1t T1

nw r:uio or tol'llll< carryiny capacity t•f a solid shafi to thutofo hollow sbufl is given by: • · ( 1-K' ) b. ( I· K' ) 1

c. K'' d. J/K'

K D,· Wht,.,.: =-

Do D1 lnstdo ..tilimcter o(hoUow sh:.H Dt~"" OuLSidc dl:u~>1cr ofhoriO\~ shaft Shaft ma•Mul~ fii'C"

!he .Siln1C:.

11le l'rincipal stresses at n poim in l\\'t~­

dimensioJ1~1 StreSS' sysu~m are a, anJ 01 and correspo11ding l"~rintipal straht.~ o1·e- c1 4U\d s~. If E and I' denote Young~s m<)dulus- and PoJs.son·s ra1io. respectively. then which Ol\e

or the following is c::orrecl'? a. a1 =Es1

E b. a1 =--, [e1 TV&2 j

1-V" E

c. a1=-- [s1- Vs, J 1-111 -

o. at =E(s, - Vc1) A poi.m i.n a two dimensional smtc of strain is subjcctt.!d to pure shearing strain of magnitudc­y radians. WWch ooo o r the foDowing is the maximum nrindpal strait1'? a. r~~v

b. rry t ..fi

0 , l.tr 12

d. 2r,y ,,.

~--~·. Consider Lhc Mohr"s circfC" ~htnvn ahoVC": What is lbc state of strl'Ss repr<..-senwd by rhi~ circle? a. a~ = a-, # 0. -r"\ = 0 b. 0', =a, =O. fw¢0 c . o-:.-= 0, <Ty = !'(\ -J; 0 cl. a"" :.f.. 0, <Tr = t "\ = 0 \Vhm is the re.lmkmship bl!'tween rhe Jin~ar elastic pruperties Young's mcK.iulus (E), rigidity modulus (0) and ~ull; m<>~ulus (Kl'l

I 9 3 3 . - =-+-

£ K G 3 9 l

b. - =-+­£ K G \1 3 J

c. - =-+-£ K G

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47.

9 1 3 d. - : -+-

1; ~ (; A I 00 111111 ,, 5 mm x 5 mm steel bar fcc. to expand is he.arcd fiom 15(1C lo 40.1C. What shall be dC\'cloped'/ rt. Tensile stre-ss b. Compressi\le stress c. Shear stress d. N\l.ttess

The shearing rorce diayam tor a b<am is sbowu iu 1he obove figure. 'll1e bending. mome111 diagram i• represented b)' which one of the following?

'I ~· a.~ 0

AI -------. b. v

•

'[:7 • c.

"

d. -~" c

Match List·l with l.ist·ll and select the c<Jrl't'ct answer using the code givt:;n bdow th~ lists List· I ( Ponnu la/Cil~JOrc!-mlmcthod) A. Ctape)ron'sthcorcm B. Maculny·s 111~1hod C. Perr) 's formulu LiSI·I I ( Dcols with 1oplc) I. Dcllcc1ion of beam 1.. Eccentrically loaded column 3. Riv<:ucdjoints -1. Conltnuous bc:.um Code:

!l. b. c. d.

A 3 4 4 1

13 2 I l 4

c I

3 J

+8.

51.

52~

5 of I I What is ~\e Shape of the shearing stress distribution across a rec.wngulor cross- seclion mm? a. Triangular b. Parabolic Mly c. Redangular only d.. A combination of rectangular and

parabolic. sh8J"' A solid shaft trunsmil'i 3 lorquc T. 111c ullowublc sheario!l •'lteSs is t. \VhQi is lhc diameter of~1e shuft?

3 , ~ b. rg c. ~~~T

if,· d. F Which ('n~ of Lhe foHowillg e;\presse.s lhe. stress factor· K used tOr design of close-.d coiled hdical spring?

4C-4 3 ,

4C - 1 4C' - 1 0.615

b. --+--4C- 4 C 4C- 4 0.615

c. 4C-I+C

d. 4C - 1 4( - 4

\Vl1cn: C = sprin£ ind~x A helicut coil spring witl1 win: diamett:r 'd' and coil diameter 'D' is >U~jcctcd 10 external IOlld. A coustaot ratio of d and D has tu be m:rimained. such that we cxlc,tsion of spring is Independent of d ond D. What is this rn1io?

a IJ3 I d 4

h. d3 / 1)4

0 413 c. 7 d.

tl~-4

IT A closed c-nil t,elicaJ spring or lUcan coil diameter ·I)' and made from a wire uf' diameter "d. i~ subjected to a tOt\JUl~ "T' ·ab{luL

the nxis <If the spring. What is the ma.xinium stress developed in the spring wire?

8T a. ltd3

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57

5$

59

b.

e. trt/3

64T d.

/rc/3

\Vber~ dOes the mwtimum hoop sire..,. 10 u thtok oylrndor Wider e:«emol pres.rure <'Oovr7 u Al lbe outcr~'UJfuo~ b Al lhc -inner sur!Occ c. Al th.o mi<J.thtcl<ness d. Al W., 213"' olll.<r ra<IIWl If one <ml of o hmgt-d column L' m~<le tix«< ond tho oth« free. how much •~ lh< cntleol load comp""'d to til<' Dligirud value" • 1'4 b. 112 c- Twice J. Po..u lunts \\'ho pPl"tnl(lted the mn.~1mum dmtonum magy lhot!l)'~ I I , TfCtiCR

b Rankine e Sl Veoont d. 1\'hses-Henl,y In tile au>m•c hard-•pl.ero mndel of th< cty•~btxu<nlt'oppcr.whrul5tbeod• lcoglh of unit cel17 u : I(Atomtcr•d•~

b. ( 4 1 Ji') X A IOIIIIC radou>

c. (2.Jl)" Alonuc md1us

d, ,fi X AlOmJC rodlus \Vhk•h one of the foiJowin_g is eorrectr1 When "devitnficanon'' of morgamc ll~'"''es ts dooe> n siMs trnnsio""" fu>m CtY""'IIine lo non­

cry.sranmt sta.re b gl"'• tran>fomlll miry a fu lly trnn<p•rml

mawnal c glos•ttM<tbllllO from noo·otJstoUmo stole

10 polypc:rystaltrne <Str:tt¢-

J. glass ts relleve<J of llll<mo.l stresses \\'hat ,. a •urfuce tmpcnect•on. w1uch sepMat~ Cl}-sl~ls <>t' drlTe,..,n• <>ri<11lotlmlS m • poly-<JrystaUi.nc ugw·t-gute. e.1llcd" • ndge d!slncotJrm b. Stat~ing Jltull c Gnun boundary d. Screw d•~locatJon Which one of lbe followinl! slatentt'l'll; i< correct in I be case of screw disloc.1llnn>1

( b = Bll1l!<<$ VcctQr f = lm&gln.$1)• Vector)

~~ h tA retP.:ndloularto l b b lS p<~rnllcl to i

(I()

61

63

c . b '" incluted to f b itUcl l.:are norrcoplnna1 nou intct!W!Cti ng

Winch ooe oflhe rollow•ne rs oorrecfl MaiiMbility ,. tho propCJly by wltich o metal or olloy can be p)~~ir.>lly deformed by applying a haruu.Jc !\tress b bendillJ! SlrCSS

c. sbeur $lt""s d eornpH~SStVe sUd$ Wlucb of the follnwtng ekoo<tus gwen below Jetennine (3) lhe m~rn\lm OUiUnnh le hardn= m steel" L Chrulnilun 2 Mangane$e 3_ Carbon 4 Molybdenum Selocl lhe wrrect answer usuJS the c<XIe g~ven bdow • 1 only b. I Wld~ o 3 only d. 2 and-! Co<::llicicol ofExpmuuon ts. prt,allcu11y n1J Uta paruoular alloy What IS thtS &II•>}? o. fladticld M.>IIJ!Oitcsc Steel b Jnvar c Y!lalbunt d Sle ll itc Cons1<ler the followlllll S\atemen\3 relotrllil to mocbruuc:llpropet li"" of ccrnmics. I Ten•• I• strength ts theo,.,ucallv high but m

prdL1.irt qunc- low. 1 Compn.!SSI\"U s1r"ngth tS mJJny lime, lo\\'cr

1han 1enstle ~trenslh J Sh= .u,mglh "' htgh. 4 TrnT\.,Wen>e strength •s eM;y 1n -ascertnin Which of !he ""'cm~ols giV<ll •buVc Ill'< corrocl? a. I and3 b 1 a11d~ 0- lnnd3 tl 2 and ~ l\ IA.<imum •ngulat \eloclly of th• CQnn.>ctin.g rod wilb • crank to c<>nnecllng md rolm I S fur a oranl.. Jpct..J of 3000 'I"" is orouruL a 30\Jradls I> 60 ''"dis c J() ... d,l• J. 3ll<l1J radls 1n three b.1.ll hc:orings rdouttficd .._. SKF 2015, 311:; and ~215 a bote lS common but Wldth 1:; thcreaJ,mg b outer dumteler 1,_-; t.ommon hut l:k.rro JS

mot<!l>ing c WJdtb j., comm,011 hut outer chametcr 1s

ueoreasmg

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GR

7U

d bore 1s ooounrm bu1 O\lter duuneter IJ: d..'Cftoslng

Whtch IJne .,f the follo'""S stotcmcnt.s rt:gardmg. cumpuk'"l s ts not <.Y\ITet:11

'' DotDb"''"' oonl<lin field> .mJ rOc<>r<l.,; b. The organi2ed Jiet of msiruotion!t given lu

lb.-:. computer to $0lvo • problem is to\lle.J • J:)togram

v Collocuon t>f3 btU; Is ca)Jod a byte U. Sprea&ih'-"1 to • u."n used 111 POR'J'RAN

'"''&""&" \\ llich unt of lhc [OJiowmg J$ not u cuttilnAJ\d moa ... mo il C'reah!' b LtSI c Sort d. Remove <:'onstder lhe foUowms. •"'temcnls obnUI UJJttfru:tJoo beunngs I 'Th<trlocalton mfluro0<>1 the lolerul crili"'' '

spi*d af ,, rotor 2 RoUct b<:oritu:.s oN oniJfricl.ll:)n be<~riag. Whtch of the •rol<men" g~ven 300\'< i!<li!n! corral? 1. I unly h z "niY c. !3oth I •nd 1 d Netther I nor 2 Consider lh¢ foUowm£st.1tcrn-c.nts. I One wny of ur..pr~mg v1brauon t."Solauon

•• ro dccrea.~. the mass of tho '~brat1ng obj .. l

2 For dl'e<:trve ;..,lotion, the n.11uml 1m1uency of Ute system should be: flll' '""' than!.; tho oxotllng freq\l<n<'l'

1\'htch of lh< sl4l<'mtnlll gwen abn\'e tslurc correct" a. I nnly b 1 only c 8<>th l nnd ; J l'IOlther I nor 2 Coru:rdi:J the tbllowing ~Uiten1cnb tn rcs:pec.t nf ·'\~1en•ucsQunless !)feels· I Austt.nitic ..St4inlcSi:S ~'tOOls .:uc hlll Jc:ued

and strengl.het!ecl 1\y <:Old w~rkins J. Austc;mtit stiunlc:ss steels c&nnoc. bc-

qucncbed ond tempered. Whtcb ~f lh< slakmcnls Ill""" uhvc ~~iilrc correct"' o 1 only b. Zonly

• B~>th I ''"d 1 d Net hcr I nur 2

DlrccUouJ~-

~\Oflhe~c 1\'fcolv.,C l lJ.nemi<'{'fJl:'I~<'J hm~~~f. ~Itt" 1 .. 1"-oUt:d t111 lbt> -,.\liefUliC'i lAY .utd W ~r II$ -~ron tR)· 'or:~ 'Ill'¢ t(' '-'JU1l'llill f Ill~ tWO

7 ul II t;l)ltctublll i.Vtfi•Uy wul k ln:l the ;ms'tl!<t"$ ,.., Otcr< 1tcr11f Ol!int lho ooda• P\·n• \)(!IQW"" Code.._ 111)

(.:) (<h

lc\.Jth A M,l R ~ mdividuaUy tme nl'ld It ., tll-i!- C\tnect expblJ'UliiM or A Ball\ A ;vul R ~ru bulivitlnlillly fnw 1!111 A t• pol lf• euu~'-l tX(ll llluUi.Uu u( A ;\ i~ m•~ In• I•• titl.w A !. filbc '~ ftt1 true

71 A<$<1'1lon (A): V•lue f!nBLD<Xttn£ Is ctlnccmed with lllCtoosing 1M qlll111ty o( th< product c..-en at enhnncod Cor.l to fUIIill the customer r«JUirements. Rt11s.on (R): C'ust'<'Olcr rc.qwtc3111.."Tll.:. arc changmg very rupidly .mel survaval o1 11

lll•nuJ~cturttJg llldu.<tl)' u llnkoo with fulfilhng 1he customers requir("ITients

7'l ~rlloo (A)i L.::vor Rul~ can be- ~I'PIIed "' determin~ rolntiv'-" umount~ of t>llMt!i pft.:.'!k'-1\l ~l anv teTnperature Rt'1lsun (R): Lt.:~Vcl Rule- 18 tc:dJ1 1tltcLI to estiJllate relft iJVe ph:><es. only •f I hey ore sohd

pb'''"i 7J ; \ s .. ..-tion (1\): To co!\C <>t Canlrol Chart tor

fratllOa rojo:ct~d l.,.ohan } bmomt~l dt:ilribUUctl is weed Rl.'tl<em (R)• In buwmtal dllitnbUltl'n probabiJih· oJ the eve.11t vunes With each draw

1d An oruon (A)l In ru<e uf C'ctJllfol C'h8m for veo~bl<s, the ovoragez of sut>-w-oups uf MtdJng> ure plotlod inJ.tMd of ploo.irtg indtvtdual reachngs R•"'!IO" (R): U boo boen 1:>tovcct ~lfll~ experimerrt5 that a:v~ruge. \\.,.til fmm no:msl dlStrl~llon CUNI!.

7S. Assl"rlion (A)~ In centra rizcd ins:pccuon. matert'l handhn& ts le.o;s R c-J>on (R): less number of gauglo;s IUld ·instruments ;ue reqmred a~ tniJ~~tJnn Ui CRi[ncd out m. one location

76 A"""rtion {•\): Submcrgocl iiN wdrltng '' nnt r<COIJIIIll:mled for hogb carbon steels. toQJ 5tctl:'i, nlummniDl. nu1~ucstum de Rcn•on (R): llus •• t>ec.•u.., of unAvllilnbihty of suitilhle nuxes, r<a<11\ ltr Ill lugh ~~mJ~dUlur~ l\J\d I0\.\1 sublirnntion t~n1pernture$

77_ AM<'I'Uon tA): Tht Lewi> tqu:nion for dosign of gear tooth po-e<hc!S 1he '""'ic load cop.1ctly at' a <Mid<''" b"''m Qf uruform ;trenglh R'"'""' (R): According to law of gear. lnterchan&l'!lh•ht)· ..; posslble nul:; wb.en s~< 113\t~ s1une p1 t':!!futc. iltlg_lll ~ud ~a.u1e utot!ulc.

78 Ast«'rtion (A): F.leroents are cl>so>fied inlo metals Aull ot..ln--melill.s L1D Lh.c- b-Asi$ uf lbL-u

at~'rm~ wo1ght~ Retsun (R): The V!llcooc olectron slfUttures cootnbutc t:o I be p11m•l)' bondllll! bc.tw""n the atoms 10 form 1!S8"'~"'"'·

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81

85

Assertion (f\ ): In des1sn of douhle 611rJ "ddmg of Wl:l)lmrnetnc•l so:etlon.> WJ!h plate.s <ab)e<Jted to ~:<lll l lo.1do lengths of pmllel wddb lire maJe uno;:aual Rcoson lR): Th~ l•l1!lths nf p.unllel woiJ~ in lillet welding of an un•)'mnle,trical "ecllon with ~ l>lo"' are $0 Jl(oportlonod d>at lh< $Um

of th~ resishng moments of welds .1btlul thc­C<'nlre of gT3VlW axJS ts zorn AssC'rtion (A): A cotter jolnt is u.s.cd to rig_1ill) cn"nect rwo coaxull rfods caoymg 1et)sjle lt111d Rt~asun (R): T·aper 1n tbe co&l\!t .cs prov1diXIl\) fi&cilttatc its rernQvnJ when i1 fails duo:. Ill tchear A,.ertinn (A): Two pulleys connecteJ hy a ~hell totatt in OJlJ:IOSite Jirec1i~ns. Rea'"" (R): 'fhe leoath of the cros.OO hell 1..:-mains c~tant. Assertion (A): In steuly romtmg cond1tmn 1ho joum•l mstde a hyurodyna11llc JOurnal bearmg rcmmn• !looting oo th~ oJI tilm. R<>llson (R): Th< hydrodymm11c P'""'""' ~•vclopo:J tn $tcut,ly rol.4ting oondluon.' to Jllumnl beonng;; bnlanc"' 1he load on 1he Joum•l Wluch one of tho: followmg ~bnt->tnent.s l$ nol c-nrr-ccl-t u .PERT i> ucli\'lty oriented And CPM i•

eveni onetll"OO b. In PERT, tbrte time cstunAtcs are n;ade.

wbetcas m CPM only one hme e5b.ma'e 1s maJe

c in P6RT slnck IS CtJiculatcd whereas 1.n

CPM l1011t' ore calculatoo d Both PERT I!Dd CPM. •re us«< for proj<et

~"lll"'U3t"IOIU

A PER'f acuvny has •n optumSlJ( wn ... csttmnh~ ol ... 3 days. a pc.s$IIllLl~lc time cstimilt.c­of 8 days. and a most ltkely limo e<tJmatc of l(J dovs 'IV'b~t i• the oxpocto.i ttmc. of tim uctcvrty'' • ~ n d.w• b. 75 duJ• c ~ 11 <Lws J. 8.5 days (~on.·~lde,r the rollowmg step!i lfl pmduatli'lfll plllnn1ng and controL 1 C'op•c1ty pl•nruog 2. 1\•lalmld r<QOU<'IIl<DI nlmuung 3 Purohosms -4 l:lesign dNJSions W!tJch ODe O[ tfu- ti,1UOWII\g i> !be' O<llr<et «>qucnc;e of tho ~~v step• in ororoll<>ns management? (1 2·3-1-1 b l-4·3·1 c + 1·2·3 tl. 1 ·~··1-3 \"''hJch one nf I he foiiOIVJl11l ts co~t? PHXh.wtion.. pltmtu11g ttnd eonliDI functions

81

88

Q(l

QJ

8 of II :1re e.~remeJy complex m a. Job·productton shop producUJ~ smaU

number of p ieces rynly once b j<>h·ph>ducuon shcop J•r<>ducmg small

numb"« of Jli=• intcrtn1ttcntly c bi1tch production •h<lr> pTOOJIC1111l a hmch

onll' once d b:Jtch production shop producujg o batch

at oJTegular mtcrval.s \\'lUch one: of the follmving ~tntement~ i!t -not correct? a. Schcdllh.:. chflrt show:s lhe pi'OCCSSl.tlg of li

Jtlh on vnnous wodc: ~;encres ngau's' ume b load clwt shows U1e proeessmg of

vnriou.s Jllhl\ on .~ W()rk centre ago1nst tim..: c D1spatcluns '" the actl\1tv related wllh

di•patohUJg_ of gOO<b to the c.ust<ln><•'-' d RoullJ18 ts tho nclivtty rel~tcd mth dtc

op<.taUons and tho~ scqua>ct to b... pcrfomwd on th~ job

What ttrm IS u'ied tr' dostgnate th< Jtr«ti"n .. r th~ ptedlllt1Wlll ~url'o;:" N l140 prtl\luc<~ bv m&Chlnmg opernt1on? ~ RotJg)m<l."< b LRy c \V•VJne:<s d. Cut off 'Vhat ;;v1nb(ll 1' used hi mthtilfe $ltrl3ce

ro\lgbnoSS?

•• b ..r c. C)~ d .\ M&cb Lts<..l w11b LL51-U owl select I he correor an~wct using tlu.\ code gjven below the hsts. l. lst·l (Uocon\rcnlJootd machrntng pro:~) A. Electro pobshing B. ElectrochomJC41 mllChmmg C, Abr~t\~ j~t m~Jctumng

D. Elcctncal diScharge mochmma L ist-11 (Bnstc prnces.•) I Thermal Meohsn1cal 2. Moclutnjcal 3 Eloctm·th<mJonl 4 Cb"''llcal Ct>de:

a. t>

B 3

r 2 -1

1.)

1

c. 4 2 3 d l ~ -1 1 In J ayllir'o> tll<ll ll(t equaLJon 15 Vi"'= "''osllinl \Vhtt:t ts the vnluc of n. for Clcr:umc, toc)lli'1 a. O. JS ~'IJ.25 b (H to0 55 c n.6io0 7>

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d ()8t.o0.9 What lll't the reasons for rtducuon qf tool w;, m n machmms opernhon" I T"nptrAtwo: r ise of cumng cdg< ~. Ch1pJ>1ng nf ""'' edge du< tn moltb.,ni<:t\1

imp8¢t 3 Ornd\llll wear~~ •ool powt .I lnore~.e in feed nf cut <>l constMt cmtong

lbrce Sclt'Cl the cunce1 a~\ver using tiJl" code _gavcn he low u. 1, 2 -uttd 3 h ~ 3 ~nd 4

e I. 3 • nd -1 cl. 1, h n<l -1

V.'luch machmmg prnce:;.<s<:s are u.•od for gear mtlnufocture'! I Foflll mJiilll!l 2. Broaclun~ ~ Roll torrmng 4 Hnl>bi.Qg Sckctlb.> torre.cl illmVC'I'IlS.UlS r.bo oo<k S''"'"' below • l. ::.;.nd 3 b. 1, 3and~ c l. 2 31)d 4

d. ~JanJ ~ C'o11$1der the followm&•taienleniS· ~~ dli onhogonlll cuumg the cutlin_g ranu IS tound h> be 075 The eutt•"!l•fl""d "' cl<l m, mm .nnd <kpth of cut 24 mm. 1\'htch ot' lho follnwms nr• c:orro<:l7 I Chipval<>clly will be 45 m/mm 2. Clup vclociiV wiU bc SO mlnuu. 1 t' lup thickne"' Wlll b< 18 mm -1 Chip Lhlcl:ncss will b<t 3l mrn Sllkct Ux: oorrc.:t iUl.Sww USIIl!llhe oo<k gM:n below: o hndl b. I rmd 4

" 2 ill'ldl J. 2 und 4 <'old ti..-gmg resuiL• m Lffii'I'OVed quahty due r~ \I bich of the followmg ? I Hatter mech:.mtcn) flTOremes nf ihe

p<ocess l U nhrokcn gram flow 3 Sm.>Olha fmr.shcs~

-1 J1tgb P"'''""" Solect !h.: corre<:l .1nnver usnllJlhe C<Jde SO'"" be.low. I I } 1 11nd J b l , .:!and -1 " 2.3ond 4 11 1. 3 and -1

'"bleb on~ of 1h¢ fo~tlowing 1> corr<:cL? Babbitt. >lf~Ullcd it>r :i gears b. bc.w~a

97

98

99

I /)II

1(11

? nl II c bolt< d- ciUlc:.b Unors Wha1 ro tho process by which two or mol'<' chemiMUy ddrcroo~ monum<rs M'¢

polymcn:Jcd to fonn • cro.s liok pol)'mcr together wnh .a by-produc1 such as. water m ammoni•. known Of? a. Additton pc>lynteri?.arion b Co>-polym<JIS<Jtlon c. Lincnr potymcti,..tion d Conden~atinn !'(llym<nrnuon AU.lcb LJst.J with LISt-U wJ >dOJl lhc <ouocl answer USJD8 the c:oOOstven beJpw the las1.n L i•t-1 (Pnnc:1pol Method) .A . Klein~,_ construction B. Rcnucdy'slh c-orem C. D'Aiemhert',pnnoiple D. Grubld s rult Li•t-TI (Col'T¢';pondJ~ Apphtati1ln ) I ln$lanlJ!DooU$ C<!Oters 111 hnkugos ~ ke,Bt1ve 1H.:ceteratlon of hnkages 3 MobJhtv of ltnkag~ 4 Dynam•c forces m linknges C<xle'

a. b. c d

A 4 :! 4 z

13 1 3 3 I

c 2 4 2 cl

D 3 I I 3

Which mo<banism produces inleaniltod rot•ry motion Uom c.Dntmuo\L~ mt;uy mot1oo,. •· \Vbltwonb mochnni•m b Srotch Yoke m•cham<~n c;, Gc:nevn mecba.msm d Elllpt,col trnmmcl A J<>Limal beallng Wllh hydro~ynamic lubtJCAIJon LS runntl'IS str:adUy Wlll! I• c~l4Tn Bmounl of mtntmum Glm 1h1ckn<s• \\q,., the IOll<l •nd sp.lcd ar" doubled. hnw dt)<s tll<­mimmu.m film thl(lknd:. vnry·, -a Remmns unchan..ged b. Get> Joublcd c Clets r«<uaed to ona.fourth of nr~lnal

\'nlue. J Gels re<IU<od to holf of ongm.,l value lntcrt'<:renco bdW<>=n •n m'"lute gear rmd • pllltoO CAD ~e rc~uccd by which of !h.< iollm.,ng• I Increasing lhc p1-:ssur6 unglc of <he tcctb

Ul tho ~'""· the numbct r\1' teeth n:n\.liDi111! 1he same

2. Deer ea.• ins lho oddU1dum of the g""r t«1h and mcreasing_ t~ ~1:1me tOr 1he piniC.)n 1ectb b' <he corresp~nd ms .. mnunL

Selcct lhe eotr~ot llru>Wor u1uug tho ~ud.: 19ven belnw •- I only

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om102

103

104

105

1116

107

b 2\tnly • Both I nnd 2 ~ Neuher I ll!lr 2 Whtch one of the f1>llnwing tS «>rrect? When '" o mth pro tiles ol' g<'Ur~ ore conjugrue. the~lidil'\g velocity between them a ·,s nh•uys zero, ull through th< path of

contact h ~~ 7.Cro, ut cemun po1nts u1ong lhc path of

'"o.nttil!t c IS n~wr uw unywht.'ift: on the fMih uf

comuct d t·ian he made 1.em hy pi'Oper sele\:tmn of

profiles For n speed rat to of lOti stnnllcsl gear hox ts obtamcd by usmg which of the followmg? u A rmir of SP•Ir gears b A pair of bevel •nd u prur of spur gcurs tn

c<ltn(l(>tmd gcur tr(tin . c. A p11ir of heltcal and a pair ol' spur gears 111

Gompouod gear tftlln ti A plltr of helical and n pair of worm gears

tn compout>d gcor train J\n>on~ the lollo\\lng four designs of u tlvw..;-cl wnh gown nUts:; M(kg) and e<temul diameter D(m). \\htch is the line \\1th the htghcst encri!Y •1orugo cup<~Coty' ' u. Platn wcular disc or undurm thic~uess b Ouubk oumcal disc d111·ker al the centre

and thonncr 111 the penphery c Double comcnl dose thrnncr nt the ccmn:

and thicker at the p.,jphory d Clf\'ulnr nng woth •·pukes

l~~~v t~ Sro ;l_ ;:s-~ '

The liglll'c abQvc shows tho schcmuue of un automobile havml! n mas~ or 900 lg ond th" - . stLo;pcnsiOll~prlngoonstnnl <'rStxiC) N/m lf1t trovels at n SJ)"<d of 72 km/hr ()n a rough road \\lth p:nndu: wuvmcss a.~ showu wh~t 1s the ror~lng lreqtt<\ncy of tho rooo on the wlteel" u 1111 1• h 4 l iz < 1.5 II~ d 20 liz Whrch 0<\C or the lollo\\lll!' rncrhamsms re~nts an mvenaon ur the- single- slitJer· Crunk chain'• u. Elltpticul tmtnmcl l> Oldham.< cOHpling. c Whn\\onh 'Iuick r~nm1 mechamsm d P.dnto.grbph meeh1lnlsn1 Whtch one of the foli0\\10g oscorrect'l

108

1119

I Ill

Il l

112

Ill ul II A hydrodylinmll' slitkr bconOI! d<;velops lo;td beanng capactty mumly because or a. slider vcluclly h. wcdgr <hapcd otl tilm t oil compressibility d f>il viscosity

o[E~'~-,..,.-60..-A 'V ~l\.

At ~ gtv«!n m~bn~ a disc: IS sp1nmng, wnt1 angular velocity "' pluur ot rtght ru>!!lcs to the paper, jsec the figure) and aJi,•r a >hon mtcrvul or llm~ Ot ll IS spmnmg wtth angular velOCity m+N6 and the axos or spin has chnnge!l dtrecuon by the amount oO. In llu~ ~itua{Jon ''hal ts the cumponem nt' ~C<le lcruuon pnrnllel t~ 011'' •. dl)/dt b, N(dll/dt) c. tlt•l/tlt <L dOidr1 Whi~h one urthe folio\\ on~ ts rorrect'l When n nut is tighten<'<! b} llliiCIOI.! 11 ' ""l>er below i~ the bolt ''ill he sul:\je<.wd to a. comprcs."lon only b. lenston c. shcnr anly tl. compress100 and sh~-Jr Which matcnnl 1~ used lOr hushes m the bushcd-pmtypc offlc.XJblc coupling'/ a. Gotlmellll b. Ploshc c Rubber d. Alummium nJC balls of the ball he011ngs nn:: manufuctun::d frmn .Sh.'d rods. The ,,pcmlions mvolvdlare, I Groull<l 1. Hot tor!!ed oil hammers J licut treatca 4. Pohshod What IS d'k: correct sequcncl1 vt' th( ubnvc oper~ti<•ns from stnrt7 a. 3-2-4-1 b. 3-2-1-4 c 1-J-1-4 ti 2-J-4-1 Weekly productoon ro~mrcmcnt> or a product are 11)00 ttonts Th< cycl< tunc or IM'Oductng (the product on u mnchn1< i> Ill minute>. The fuctory works on l\\o ~l1f\ bi!$js in \'vhich total ovutlohlc ttme ts 16 hours Out of tl1c ovail~f>le lime oboul 25'1• is e~pected to be wasted on breo~ d0"1lS, motcrrol unuvotlablltty an!l ~unhty r<lntcd problems The factory works

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om113.

I H.

115

for 3 days 111 a \\ec.l. How DlilnY macluncs arc required to fulftll d1c prodtJcllon rcquJrCmcnts? n. 2 b. 3 c. ~ d. (l

Consider the obovo network. AcUvlt} times are _given in numbe-r or days. T he earliest <·<peeled occurrence rime (TE) for O\'ont j(J is: n. 22 b. 23 c. 24 d. 2S Which one or the followmg is not a technique of l..ong Range Forocnstll•g? a. Mnrkct Research and M :wket Sul'vey b. D<:lpln "' Collect we Opiuio~ d. Corrclat1on and Regres.s:ion Using the e~ponentiaJ smooth.iJtS method of forecast ing, what will be. the forecast for the founl1 1\eek if the actual and fnree.1Sted demand for lh~ thu·d week is 48u and 501) respcclll'ei)' and "= 0.2 a. 411\1 b. 496 c. 511!1 d. :104

I I ut' I I I 16. Consader tllc rollowmg c.hamctcriS1Jc.s

or asscmbb hnc balwJcmg:

J 17

118

I I ~ .

I. npportlonmcnl o f scqucJitiaJ work uctivatJcs into \\·ork st~tions

l . high utilir.ation of oquipmcut 3. minill1 1l.JJ(Iou or Idle dJne Which of the st11tcmcnts gh·cn abo1·e on: COrt"CCl'! a. 1. 2and3 b, I and 2 on I} c. 2 and 3 only d. I and 3 onl)' ln d1c production of a product the fixed cosls­are Rs. 6,(\()IJ/· and the voriable rost is Rs. 0/· per producL if lbo sale price of the producl is Rs. I ll·. the break e1•cn 1·olume of products to be made will bo: • . 2~0(1

b. 3(1011 0 4(ijl()

d. 6(~111 1'bo mter-arrh·al times Ol u tool crib ure c:<pouential with an nn:rage hme of IU mh,utes n.nd lhc length of the scrvtcc t~me ~ ·assullled to be cxponcutinl with menn 6 minutes The probability that u person arri1 ins at the l)ooth will ho1 e to wait •s eqnal tu: a I) Ll b. t).4t1 c. 0.42 d. ll.(• tf A ts grcalcr Uwn B then 1i IS. expressed in FORTRAN ns: u. A > B b. AGTB c. A.OT,B d. AGT,B