IES-Mechanical-Engineering-2011.pdf

8/14/2019 IES-Mechanical-Engineering-2011.pdf

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DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASKED TO DO SOT.B.C. : P-RSR-L-ZRA Test Booklet Series

TEST OOKLETMECHANICAL ENGINEERING

Paper ITime Allowed: Two Hours Maximum Marks 200

INSTRUCTIONSI . IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD

CHECK THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORt ~ t a : ; ; . ; t r a n ~ f e r and voluxne change are

zero3. Reduced pressure irl

a) AlwayB le;-;H than atmospheric pres8ureb) Always unityc) An index of molecular position of a gasd; Dlmensl.onlestl

4. Ml>tch Lt t I with List II and select theeorrect answer using the code given below thelist.

ist istA. n 1B o I 4

Match List I with List II and oelect thcorrect answer using the code given below thlists :

ist lA. Interchange of

matter is notpossible in aB. Any processes

in which thesystem returnsto its originalcondition orstate is called

c Interchange ofmatter isposRible in a

D The quantityof matter underconsideration inthertrlodynamic:,is called

Code:A B c

a} 2 1 4(b) 3 1 4c) 2 4 1d) 3 4 1

D3232

ist l l1. Open

system

3. Closed:o:oystem

4. Cycle

. ~ic n 10 6. A closed system one in which0. ~ oCode:

A B:a) 4 3(bJ 3c) 4 2

(d) l 2

P-RSRlZRA

c D2 l2 43 13 4

L1/

I 2 - A l

a) Mass d o e ~ not r o f i l ~ b o u n d a r i e ~ s of t:t>ystem though energy may do so

(b) Mass croses lhe boundary but notenergy

{c) Neither ma:-:;s nor f ~ n e r g y eros::boundary of the system

(d) Both energy and r n a ~ crossboundaries of the ~ y : : t e r n

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Work transfer between the system and the 12 Lowest COP is of vapoursurroundingsa) Is a point functionb) Is always given by JP dvc) Is a function of pressure onlyd) Depends on the path followed by the

system

Air is being forced by the bicycle pump into a 13.tyre against a pressure of 45 bars. A slowdownward movement of the piston can beapproximated asa) Isobaric processb) Adiabatic processc) Throttling processd) Isothermal process

Isentropic flow is

a) Compression cycle with superheatedvapour

b) Compression cycle with dry compressionc) Compression cycle with wet compressiond) Absorption cycle

The cycle in which heat is supplied atconstant volume and rejected at constantpressure is known asa) Dual combustion cycleb) Diesel cyclec) Atkinson cycled) Rankine cycle

a) Irreversible adiabatic flowb) Reversible adiabatic flowc) Ideal fluid flow

14. The boundary layer separation occurs whena) Pressure gradient is positiveb) Pressure gradient is zero

d) Frictionless reversible flow c) Pressure gradient is negative0 Increase in entropy of a system represents d) Nqne of the above

a) Increase in availability of energyb) Increase in temperature 15. Far minimum work input in a two-stagecompression process the intermediatec) Decrease in pressure pressure is thed) Degradation of energy a) Arithmetic mean of suction and. dQThe value of -. TS for an irreversible cycle1 discharge pressuresb) Logarithmic mean of suction anda) Equal to zero discharge pressuresb) Greater than zero c) Geometric mean of suction anddischarge pre-ssuresc) Less than zero d) Hyperbolic mean of suction andd) Unity discharge pressures

3 - A

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16. Air injection in IC engine refers to injection 20.of(.a) Air onlyol Liquid fuel only

Liquid h1el and aird) Supprcharging air

17. u p e r c h a r ~ i n g is the process of(ot) Supplying the intake of an engine with

air at a d e n ~ i t y greater than the densityof the l::lurrounding atn1ospht>rc

tb) Providing forced cooling airc) Injection of compreRsed air to remove

combustion products fully(d) Raising exhaust pres:::;ure

18. : 'urho prop-engine has the followingadditional feature over the turbojet :la) Propeller(b l Diffuer(c) Star t ing engine(d) Turbine and combustion chamber

19. In the S engine, highest UBHC

Match List l with Lit IT and elect tcorrect answer using the code given below tlists

Li


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22 When a hydrocarbon fuel burns in excess air, 26Orsat analysis of products of combustion willshowa) CO, C02 and N2b) C02, CO, N2 and H 20c) C02, N 2, 0 2 and H 20d) C02, N2 and 0 2

23 What will be the products of combustinnshown by an Orsat analyzer when naturalgas burns in deficit air ?a) C02, 0 2 and N2

(b)

Which one of the following statements is otcorrect?a} Fusion is the combination of heavy

nuclei of elements resulting in therelease of heat energy

b) Neutron bombardment is the mostcommon and practiced method ofinitiation of re ction in fission materials

c) When the multiplication factor isgreater than 1 the chain reaction isuncontrollable

d) The reactor produces a p and neutronradiations. Of all these y radiation is themost dangerous

C02 , CO and N2c) C02, CO, N 2 and H20

27. The r lflectivity in a reactor depends upona) Geometry of the reflector

24.

d) C02 CO, N 2 and 0 2

The energy produced by 45 tons of highgrade coal is equivalent to the energyproduced bya) 1 kg of Uraniumb) 1 gram of Uranium

(c) 100 grams of Uraniumd) 10 grams of Uranium

25 Enriched Uranium is one in whicha) Percentage of U235 has been artificially

incre sedb) Percentage of U238 has been artificiallyincreasedc) e r c ~ n t a g e of U234 has been artificially

increasedd) Extra energy is pumped from outside

28

29

P-RSR-L-ZRA. 5 - A l

(b) Energy of neutronsc) Properties of reflectord) All of these

Shielding in a nuclear power plant is donea) To protect against neutron and gammaraysb) To absorb excess neutronsc) To slow down the speed of fast moving

neutronsd) To return the neutrons back into thecore of the reactor

This substance has the minimum value ofthermal conductivity ;a) Airb) Waterc) Plasticd) Rubber

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30.

31.

32.

Di. e n ~ : i o n l e ~ s time ia represented by1a l Hmt number,-b; ii'ourier number

~ l : F ~ u l e r nornbert.di Grat:"tL number

If the radir.1s of any current carryingconductor is tes:; than the critical radius, thenthe addit.ion of e]c,ctrical insulation will1enablP t h t ~ wire t.o carry a hi zher currt:nt 1 34.btCfJ.URt(a: The heat loss from the wire would

decrea.se\bi The heat lo:.;s from the wire would

;.ncreaseTtw thermal resistance of the i n ~ u l a t b n 11s reduwd. ITh thermal re'i"tancc of the c o n d u c t o r ~i : n t n : ~ a : : > t ~ d

Match n ~ t l wit.h Li;)t II and setect the jcorrel't answt>r uRing the code given b t ~ o w the 35list:'l

st l ListA '\umber of L Regenerators

Tran:sfer CnibB. Periodic flow 2. J:< ouling factor

heat e x c h a n g e r ~( ; Pha.-se change 3. A measure ofheat

exchanger :sizeD. Dqlo,..;iti.on on 4. Conden8crs

ht at ~ x c h a n g u rs u r f a ~

Code

A B c D(a; 3 4 1 2(bl 2 4 l 3


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36. In the film established along a vertical plate 41.during condensation of any vapour over theplates, the temperature distribution curve is

In a refrigeration plant, if the condensertemperature increases the power input to thecompressor will

37.

a) Concave upwardsb) Concave downwardsc) Parabolicd) Straight line

In spite of large heat transfer coefficients inboiling Jiquids cavities are usedadvantageously when the entire surface isexposed toa) Nucleate boilingb) Film boilingc) Transition boilingd) Pool boiling

38. For a fluid flowing over a flat plate, theNusselt number at a point 05 m from theleading edge is 100. I f the thermalconductivity of the fluid is 0025 W/mK, thecoefficient of convective heat transfer isa) woo W/m2Kb) 5 W/m2Kc) 5 x 10-4 W/m2Kd) 125 x 10-4 Wim 2K

39. The unit of the following parameter is otm2 s :a) Thermal diiTusivityb) Kinematic viscosityc) Mass diffusivityd) Dynamic viscosity

40. Ice is very close to aa) Gray bodyb) Black bodyc) White bodyd) Specular body

42.

a) Increaseb) Decreasee) Remain the samed) Be unpredictable

In gasexpander

cycle refrigeration system,replaces the throttle valve

vapour compression system. becausean

of a

a) The pressure drop obtained is notadeqnate

b) The drop in temperature by throttlingthe gas is very small

c) It reduces the irreversibility in thesystem

d) Heat loss is significantly decreased withthe expander

43. In an aircraft refrigeration system, thepressure at the cooling turbine outlet is equaltoa) Ambient pressureb) Cabin pressurec) Compressor inlet pressured) Evaporator pressure

44. A condenser of a refrigeration system rejectsheat at a rate of 120 kW, while thecompressor of the system consumes a powerof 30 kW. The COP of the systam will bea) 1/4b) 1/3c) 3d) 4

P RSR L ZRA I 7 A l

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45. Wh1ch of the following i ot an essential ~ 5 0 . For a given dry bulb ternperatur.,, as thecompunent of any rethf.wration s y ~ t e m whererefrigeration d ect "' produced byvaporizatio.:k of rcfngerant ?

(bl o n d t n ~ n(c) ~ v a p o r u t n rtd) l < ~ x p a n s i o n device

46. If the spedfi< humidity of moist air remainthe same but lt....; dry bulb temperature i 51.increases. its dew pmnt temperature{a) Rem.aim:; the sarne

{c_} D e c r e a b e ~


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~ a t e h List I with List II and select the 158.correct anl':'wer using the code given below the

The p r e ~ s u r e in Pal':'caJ curre""ponding to 3 emcolun1n of Mercury is

lists ;

A. CapiilarityB. Vapour

prensur-ec ViscosityD Specific

gravityCode

A B c D(a; 2 3 1 4(hl 4 3 1 2c} 2 I 3 4

(dl 4 3 2By jupereharging thepossibility of knockinga) Det:reatie:s

(b) I n c r e a s e ~(c) Renutins c o n ~ t a n t(d) "one of the above

ListI . Cavitation2. Density of

water3. Shear f o r c e ~4. Surface

tension

diesel enginet the

With increase in p r t ~ : : > u r e , the bulk modulusof elasticity(a) l n c r e a s e ~(b) DecreaBesc Ren1ainx conntant

. d ~ l'lcnase8< and then decreases

I'

Ia) 79886b) 39943c) 26628

(d) 1331459 Pascal's law states that p r e ~ s u r e at a point is

equal in all directions in a(a) Liquid at restb) Fluid at rest

(c; Laminar flow{d; Turbulent flow

As a ship enters into a rivl-'r from ..,, :a, onecan expect that(a) It rises a little(b) It ,;ink; a little(c) It remains a t the same IPvel(d) I ts level dependt-' on the material U,;jed

for con::;trudion

61. The buoyancy force is(a) Equal to volume of :iquid displaced(b) Force nece:::;::;ary to maintain eqt..Hibrium

of a submerged body(c) The resultant force acting on a floating

body

7 Calcul..J.tion of Uleta-ct nt.tic height of afloating body involves ;::;ec-ond moment of area.

(d) The resultant force on " body due to thefluid surrounding it

i ht:> axis about which t h i ~ moment is to be 62.calculated pal lse8 through the(a) Top horizontal surface of the body(b) Bottom ho rizontal surface of the body{c) Centre of gravity of the body(d) Centre of buoyancy

I A l

The submerged body will bte in "tableequilibrium if the centre of buoyancy H(a) Is below the centl"e of gravity G(b) Coincides with G(c) Is above the meta-centn' M(d) Is above G

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63

64

The stability of a floating body is obtained 67when its(a) Centre of gravity is below the centre of

buoyancy(b) Meta-centric height is negative(c) Meta-centric height is positive(d) Meta-centric height is zeroIf flow conditions satisfy Laplace equation 68 .then(a) Flow is rotational(b) Flow does not satisfy continuity

equation(c) Flow is irrotational but does not satisfy

continuity equation(d) Flow 1s irrotational and satisfiescontinuity equation

For an irrotational motion(a) The fluid element does not undergo a

shear(b) The fluid particles do not undergo

cirt :u1ar motion(c) The circulation around any path is ze(d) The viscosity may not be zero

The flow past the cylinder with the vormotion causes a net transverse motion. Ttransverse force is known as(a) Magnus effect(b) Robins effect(c) D Alcmbert s Paradox(d) Rankine doublet

65 The stream function of a two-dimensionalflow is J = 2xy. The flow is

69 The conditions in which Bernoulli s equatiapplies are

66

(a) Rotational(b) Irrotational(c) Vortex flow(d) Unsteady pulsating flow

Consider the following statements pertainingto kinematics and dynamics of fluid flow :1. For IJ = x2 - y2, velocity at (1, l is

2 fi2. For all types of flow, stream and

potential functions exist.3. Bernoulli s equation is not valid for real

fluid flow.Which of these statements are correct ?(a) 1 2 and 3(b) 1 and 2 only(c) 2 and 3 only(d) 1 and 3 only

70

P-RSR-L-ZRA 1 0 - A l

L The flow must be inviscid.2.

34.

The fluid may be compressibleincompressible.The flow must be steady.There should be only one stream linethe flow.

(a) 1 2, 3 and 4b) 1 2 and 3 only

(c) 1, 3 and 4 only(d) 2, 3 and 4 onlyA pump, having an efficiency of 90 , liwater to a height of 155 m at the rate75 m 3/s. The friction head loss in the pipe13 m. The required pump power, in kW, wbea) 13,730

(b) 1,373c) 1373

(d) 1373

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71. Match List I with List II and select the 75. The measurement of flow rate in a pipe is

72.

correct answer using the code given below thelists :

List ListA. Rotameter 1. Vena contractaB. Venturi meter 2. Tapering tubec Orifice-meter 3. Convergent-

divergentD. Flow nozzle 4. Bell mouth entryCode:

B c Da) 4 3 1 2b) 2 3 1 4c) 4 1 3 2d) 2 1 3 4

Which one of the following instruments is arate meter?a) Disk meterb) Hot wire anemometerc) Pitot tubed) Venturimeter

73. Navier- Stokes equations are useful in theanalysis ofa) Turbulent flowsb) Vortex flowsc) Viscous flows

{d) Rotational flows74. In an experiment to determine the rheological

behaviour of a material, the observed relationbetween shear stress t, and rate of shear

o c ~ ; r . The . du .stra1n - , 1s T =dy .material isa) A Newtonian fluidb) A thixotropic substancec) A Bingham plasticd) An ideal plastic

done by a combination of venturimeter anda) V-notchb) Pitot tubec) Orifice-meterd) Manometer

76. The loss of head due to sudden enlargementis attributed to

77.

78.

a) Viscosity of fluidb) Generation of heatc) Roughness of piped) Production and .dissipation of turbulent

energy

A thin plate has been placed parallel to flowdirection. The relative magnitude of frictionand pressure drags will bea) Negligible friction as well as pressure

dragb) Negligible pressure drag and maximum

friction dragc) Maximum pressure drag and negligible

.. friction dragd) Pressure drag equals the friction drag

For laminar flowdischarge varies

through

a) Linearly as the diameter

a pipe,

b) Inversely as the square of diameterc) As the inverse of viscosityd} Inversely as the pressure gradient

the

P-RSR-L-ZRA {11 A]

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79. Match Lt>'t I W1th List II and select the s2.corr-ed answer using the code given betowthe h s t ~ : l

Li t l ListA Coaxial cylmder 1. Hagen

v l ~ o m ~ t e r PoiseuiHeequabon

B Cap1llu.ry tube 2. Stokes law\ i ~ c u U : l t = t e r

C Saybolt 3. Newton's lawvi5CO ff i t t eT of viscosity

D. F'aHin;; = ' P ~ h : r ~ : :visn}meter

4 Effiux 83.viscometer I

Code : IIA B c D

la:O I 4 3i b ~ 3 4 2

I

Flow takes place at Rtynolds number of 150jn two d i f f t . ~ r e n t pipe "$ with relative r o u ~ h n e s ~ -of 0001 and 0002. The fridion factorai Will be higher in caM" of plpP with

relative r o u g h n t : : - . ~ of 0001(b) Will be higher in c a ~ e of pipe with

rei.ative r o u g h n ~ t i ~ uf 0002{c) wm be same in both pipesd) In the two pipes eannat be compared un

the basis of data f, JVen

Weber number lB ratio {>f :::.quare root oinertia force to(a) Surface tension forcefb) Gravity force(c) Presbure fOrce(d) Viscous force

{ c ~ l 4 3 '84. \Vhat h;; the correct t>tatcment regardindi 3 t 1 2

80. When air i adiabatically &aturated, thet t ~ m p ( - r a t u r c : attained is the

81.

:a) Dew point temperature:bJ Dry bulb temperature

Wet bulb temperatured Apparatus Dew-point temperature

fi\)r a glVen discharge in a channel at criticaldeptb

'.a) The ;-;pecifi ; energy is minimum'b) The ~ p t c l . f i c energy is maxilnum

~ c : The t o t . ; . ~ l t ~ n e r g y is minimum\d; The total energy is maximam

I normal shock wave in a ?,a:'i '

I

{a) Normal a h o t ~ k .it' : r e v ~ - r - s i b l e(b) The downstream llow a . wt:ll >

upstream. flow i:: iiupt'r;:.onic(c) The entropy increa:o;es across the s h o d ~(d) The entropy rernaino con"tant

85.. A e r o : - - . . ~ a normal . ,;hock

86.

(a} The p r e s ~ u n ~ and temperu.ture rise(b) The denity and temperature decreae(c) The ve]ocity and pressurt ' increase(d) The velocity and pressure decreaseAir vessels are used in rec1p.tocuting pump:in o r d ~ r to(a) Increae th" delivery head(b) Reduce suc.tion head{c} Minirnize delivery head flut.:tuution{dJ Rt duce accelt:'rattng head

P-RSRLZRA ( 12 A )

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A reciprocating water pump delivers 91.100 litres of water per second against asuction head of 5 m and a delivery head of

In modern steam generator, the correct pathof gases from boiler furnace to chimney isa) Boiler furnace, Economizer, Air15 m. The power required to drive the pump

is near abouta) 10 kW

(b) 15 kc) 20kW

(d) 25 kWIn a reaction turbinea) I t is possible to regulate the flow

without lossb) It must be placed at the foot of the fall

and above the tail race{c) Work done is purely by the change inthe kinetic energy of the jet

d) Only part of the head is converted intovelocity before the water enters thewheel

A Kaplan turbine is a{a) Outward flow reaction turbineb) Inward flow impulse turbinec) Low head axial flow turbined) High head mixed flow turbine

Which of the following hydraulic turbines arereaction turbines ?1. Francis2. Kaplan3. Propellera) 1, 2 and 3b) 1 and 2 onlyc) 2 and 3 onlyd) 1 and 3 only

92.

93.

preheater, Superheater and Chimneyb) Boiler furnace, Superheater, Air

preheater, Economizer and Chimneyc) Boiler furnace, Air preheater,

Superheater, Economizer and Chimneyd) Boiler furnace, Superheater,

Economizer, Air preheater and ChimneyClapeyron s equation is used for finding outthea) Dryness fraction of steam only

(b) Entropy of superheated vapour onlyc) Specific volume at any temperature and

pressured) Total heat of superheated steam onlyIn a locomotive boiler, the draught isproduced bya) Chimneyb) ID fanc) FD fand) Steam jet

94. Out of the following impurities generallyfound in water, which one requires specialconsideration in case of very high pressureboilers ?

95.

a) Hydrogen b) Ammoniac) Silicad) Dissolved salts

Willans line representsa) Total steam consumption vs. power

output with throttle governingb) Total steam consumption vs. poweroutput with cutoff governingc) Behaviour of supersaturated steam

through nozzlesd) Condensation of steam while flowing

through the turbine

I 1 3 - A

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96. Con,.ider t.he following statements for an 100. Which of the following ,,tatementa is n

97.

98.

99.

i n c o r n p r e ~ - a b l e fluid flowing through a c o r r ~ c t for the volumtt.r1c efficiency ufccnvt--rg:pnt-divergent duct : reciprocating air comprt-_-'.:-:or 'l. Tht- r ' o n v t ~ r g e n t part acts a:s a nozzle.2, The dJvergent part acts as a dilfuser.3. Tlw maximum limiting speed of the

fluid in the sonic velocity.Which of tht: :R' statements arc correct ?d L 2 m d 3il: : l and i onlyc) 2 and 3 only

1 and 3 onlyAn h;entropic nozzle in dischaqfing steamthrough cntical pressure ratw. If the hackp r e : - : ~ u n ~ b further decreased, tht dischargewill I: D e c r e a ~ e Iic: Remam unalfected

a) I t decreases with tncrease in a:-nbitemperature

(b) t increases with decreast l n pressuratio

c) It increases with det..Tease in clearantratio

(d) It decreases with m.creasc in delivpressure

101 In a single stage reciprocatingcompressor, the work done on air to c o m p r eit frorn suction prcssurt:> to delivf ry pressuwill be minimum when the c o m p r e ~ : ; s i o n is

~ a )b )cJ

(d)

bothermai proct-s""Adiabatic pruces.,Polytropic procesConstant preosure process(b l n c n ~ a : ; e ,

i


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In which modification of simple gascjcle is work ratio increased ?

turbine 108. Assertion (A) : In fluid system model studies,a simple scaling-up ofmeasurements made on themodel may not yield resultsaccurately corresponding tothe prototype.

1. Regenerative gas turbine cycle2. Gas turbine cycle with reheatinga) Both 1 and 2b) 1 onlyc) 2 onlyd) Neither 1 nor 2

Reason lf,J Surface tension forces may herelatively much moresignificant in the model thanin the prototype.

106. Reheat between multi-stage expansions in 109. Assertion (A) : In non-Newtonian fluids theshear stress at any point isnot a linear function of normaldistance from the surface.

Joule cycle increases1. Overall work output2. The work ratio3. The thermal efficiencyWhich of the above are correct ? a) 1, 2 and 3b) 1 and 2 onlyc) 2 and 3 onlyd) 1 and 3 only

irections : Each of the next fourteen (14) itemsconsists of two statements, one labelled as theAssertion (A) and the other as Reason (R) .ou re to ex mine these two st temepts

carefully and select the answers to these itemsusing the codes giuen below :Codes:.a) Both A and R are individually true and

R is the correct explanation of Ab) Both A and R are individually true but

R is not the correct explanation of Ac) A is true but R is falsed) A is false but R is true

107. Assertion (A) : In SI engines,compression ratioknocking.

higherinduces

Reason (R) : Higher compression ratioincreases the ternperature ofthe end mixture.

Reason R) This behaviour usually arisesbecause the fluid moleculesare very large, like polymersor proteins.

110. Assertion (A) : The mercury level inside the

Reason R)

tube shall rise above the levelof mercury outside.The cohesive force betweenthe molecules of mercury isgreater than the adhesiveforce between mercury andglass.

111. Assertion (A) : At great depth, the verticaldistance between the centre ofpressure and the centre ofarea of immersed surfacebecomes negligible.

Reason (R) : The depth of centre ofpressure of any immersedsurface is independent of thedensity of the liquid.

112. Assertion (A) : Increasing the meta-centricheight gives greater stability,but reduces the period of roll,so that the vessel is lesscomfortable for passengers.

Reason (R) : Warships and racing yachtshave larger meta-centricheight as their stability ismore important than comfort.

P-RSR-L-ZRA i15-A

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After the fluid do\\'nstream ofthe orifice plate hasre ~ 8 t a b l i 8 h e d , it wiU returnto the 3ame p r e a ~ ; u r e tha.t lthad up:.itream nf thE: orffi.ceplate.

R ~ a . ' i m t R) According- to B(:rnoulh':5'tht::onm w1th usu.ai{ : 1 : - : . R u m p t i . u n ~ . for flow b e t w ~ e ntwo point i, the oum of k i n e t ~ c ,putt ntial and p r e : : 5 t . H ' t ~t:nergies remain con.:-,;tan.t.

ln -t Rayleigh flow c ; ~ "ubsonicL : O r n p . r - e s ~ - . i b l e flow heaungl ~ a u s e s the ?.1.ach number tort >H -h a maximur.n af I butthe ltati.c t e m p ~ r a t u r e at thispoint is ~ _ e - j ' ) than that due tofnetional efli: ct:-; a1ont'.

i--,t.or::tge ofinternal

117 Asserlton (A) : In .:i modt:rn coal burninl:>te-r.:un g ~ n t ' r a t o r thtemperature of exitt_ng flu

g a ~ w ~ from tht chirnnt.o>hould beiow 100 C.

Rf aBon RJ : T h ~ lower th t ti fn;.


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SP CE FOR ROUGH WORK

P RSR L ZRA I 1 7 - A

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SP CE FOR ROUGH WOR

P RSR L ZRA

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SP CE FOR ROUGH WOR

19-A)

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P RSR l ZR 2 A

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1. Total number of instantaneous center> ofrotation for a mechanism having n l n k ~ ts .

nln I)(a) 2n(b) 2(c) n

(d) n2 Consider the following statements

pertaining to an example for a cylindricalpa T:\. Piston and cylinder of an IC engme2. Shaft supported by a foot step bearing3. Doctors InJection syringe4. A screw driver operating on a screwWhich of these statements are correct ?a} I and 4

(b) 2 and 3(c) I and 3ld) 3 and4

3 The number of degrees of freedom of anepicyclic gear train is(a) Zero(b) One(c) Two(d) Three

4. The advantages of involute profile overcyclmdal are gtven bdow. Wbich of th.:seis NOT corre.:t(a) The interference is inherently absent in

the mvolute system(b) In the involute system, the pn:ssureangle b constant from commencement

to ' -nd of engagement(c) Ibe straight teeth of the baste rack for

the imolute profile admits of simpletools

(d) The profile for the flank and faceis a single curve in the involute y ~ t e m

2

5. Fl)wheel absorbs em:rg) during those;:periods of crank rotation wh.:n ta) The twtsting moment greater than

the reststing momcm(b) The twisting moment is equal to the

resisting moment(c) The twisting momt:nt is I.:ss than th.:

resisting moment(d) Tbe load on the engine falls

6. Introduction of the flywhed n > rotatingsystem smoothen" :(a) The bending moment on tht: rotating

shaft(b) The twisting moment on tht: shaft(c) Th.: bending str on th.: shaft(d) The axial forct: along the shaft

7. A four stroke six cyhnd.:r m line enginesymmetrical about centre hn.: .: an bebalanced for :(a) Primary inertia forces and coup .:s only(b) Primary and secondary m..:rtia forc.::s

only(c) Secondary mt:rtia forces and couples

only(d) All forces and o u p k ~

8. Given below art: four Vee twin engines withdifferent included angles between cylinderaxes. Whtch one of these engmes can becornplt:tt:ly balanc.:d for primary :orces byattaching a sing t: revulvmg mass oppositeto the crank pin ?(a) Vee 45" twin .:ngin.:(b) Vee 90" twin cngint:(c) Vee 60" twin engme(d) Vee 120" twm ..:ngin.:

9. Large field gun> whtch .;omt: to initialposition after firing in >hort.:st possible urn.:are:(a) l. nder dampt d(b) Critically damped(c) Over damped(d) Un-damped

(Contd.)www.examrace.co


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10. Which of the following type of viscousdamping will give periodic motion to thevibrating body ?1. Under damping2. Critical damping3. Over damping(a) 1 only(b) 2 only

(c) 3 only(d) 1 and2

11: Consider the following statements.;Transmissibility of vibnitions :

I . Is more than I , when ro < fi( )n( ) = 2. Is less than I, when- > ...J2ro,

3. Increases as the damping is increasedWhich of these statements are correct ?(a) 1,2and3(b) I and 2 only(c) 2 and 3 only(d) . 1 and 3 only

12. Rayleigh s method of computing the.fundamental natural frequency is based on:{a) Conservation of energy(b) Conservation of momentum(c) Conservation of masses .(d) Laws of statics

13. In hydrodynamic journal bearings, if theclearance ratio IS halved then the .Sommerfeld number S and the coefficientof friction f l will change as :(a) S becomes double and f l is halved(b) . S becomes four times and f l is doubled(c) S becomes four times and f l is halved(d) S becomes double and f l is also

doubled

3

14. A rope has been designated as 6x.J9. Thenumbers 6 and 19 respectively stand for : ,(a) Rope diameter and the number ofwires(b) Rope diameter and the number ofstrands(c) Number ofstrands and the number ofwir s(d) Number of wires and the number of

strands.15. If there are n1 discs on the driving shaft andt 2 discs on the driven shaft in a multi-plateclutch, then the number of pairs of contactsurfaces is :

a) + n,.(b) n + p I(c) n , n 2 -2(d) n 1 + n2 + I

16. Consider the following statementspertaining to V belts in powertransmission :1. Standard V belts are available in 7 sizes

of cross section A to G2. Standard V belts are available in sizes

of cross section A to E3. Standard V belts are available in sizes

of cross section A to E with A havinglargest cross section .4. The included angle for the belt groovein usually around 35 .Which of hese statements are correct ?(a) I only{b) 2 and 4(c) 3and4

(d) I and 417. An axle is a machine part that is subjected

to:(a) T.ransverse loads and bending moment(b) Twisting moment only(c) Twisting moment and axial load(d) Bending moment and axial load



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18. In a bolt of unitorm strength :

19.

20.

(a} '\lorninal diameter of thread is equai tothe diameter of shank of the bolt

(b) Nominai diamet.:r of thread is largerthan th.: dtameter of shank of the bolt

(c) ~ o m i n l diameter of hread is less thanthe diameter of shank of the boltld) Core diameter of hreads is equal to thediamct..-r of shank of the bolt

Interference fit joints arc provided for :(a) Assembling bush bl aring in housingb) Mountmg hl avy duty gears on shafts

(c) Mountmg pulley on shafts(d) Assembly of flywheels on shaftWhen a journal rotates in anticlockwrsedirection at high speed in a bearing havingadequate supply of lubncant, it will be :(a) Pushed to the left ofthe bearing centreand is likely to have no metal contactwith the bearing(b) Resting just belov. the bearing centn:

without mak.mg mt:tal to metal contact(c) Pushed to fhe right ofthe bearing centre

and make: no metal to metal contact(d} Running concentric with the bearing

centre and make no metal to metalcontact

In win: ropes which one of the followingstatements correl-t(a) Bending stress is din.-ctly proportional

to tne wire diameter and inverselyproportwnal tv the sheave diameter(b) Both. atigue and wear are due to the

tensih: stress on the wires bearingagainst the sheaw(c) Bending >tress is inversely

prorortional to the wire diameter anddirectly proportional to sheavediameter

(d) Both fatigue and wear are due to shearstress on t h ~ ; wires hearing against thesheave

22.

:> 3

24

25.

4

.. q ' ..1B . f . . . ' f . L ~ ~ tp. .

qD

'X : c ; c _ ~ x ~ ~ . - - 1 . . t

- - -A compound fillet welded jomt is loadedby P as shown. The maximum sheanngstress occurs at point :(a) A and D(b) Band Dc) A onlyd) ConlyA fillet weld is loaded paralld to its length lby a load P. If he weld leg is h. the averageshear stress on the throat area ; , :pa) l

pb) 05hl2Pc) h/1414 pd) hi

Bevel gears having equal number of teethand equal pitch angks ..:onnect twoorthogonally intersecting shafts. T h i ~ systemof gears is known as :(a) Crown gears(b) Hypoid gears(c) Worm gears(d) Mitre gearsA solid steel shaft of diameter d and len&>th

is subjected to twisting moment : . Anothershaft B of brass havmg same diameter d,but length //2 is also subjected to the samemoment. If shear modulus of sted is twotimes that of brass, the ratio of the angulartwist of steel to that of brdSs shaft is :a) I : 2(b) I : 1

(c) 2 : 1(d) 4 ' I



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26.

27.

28.

29.

A high pressure angle for spur gears leads to :(a) Minimum axial thrust(b) Greater backlash(c) More interference(d) Wide base and stronger toothMatch List-l with List-II and select thecorrect answer using the code given belowthe lists :

List- Lis -IlA. Unwin's formula I. BearingB. Wahl factor 2. Rivetsc Reynold's equation 3. GearsD. Lewis form factor 4. SpringsCode:

A 8 c D(a) 3 I 4 2(b) 2 I 4 3(c) 3 4 I 2(d) 2 4 I 3Antifriction bearings are normally used inshafts:I. Running at 20,000 to 40,000 rpm2. Running at speeds up to 6,000 rpm3. Of diameters up to 500 mm4. Of diameter more than 500 mrn(a) I and 3(b) 2 and 3(c) 2 and 4(d) Iand4I c:--+ 10 kN lmH m IA prismatic bar, as shown in figure issupported between rigid supports. Thesupport reactions will be :(a) R l Q k N a n d R 20 kNA 3 B J(b)(c)d)

R 20 kNandR =. QkNA 3 . 3R"=IOkN and R8 =IOkNR,. = 5 kN and R = 5 kN

30.

31.

32.

5

y

,A rectangular strain rosette, shown infigure, gives following readings in astrain measurement task, 1 = 1OOOx 1 -,= 800xJO- a n d ~ : = 600xiO-. Thedirection of the major principal strain withrespect to gauge I is :(a) oo(b) 1s(c) 30(d) 45If a piece of material neither expands norcontracts in volume when subjected tostresses, then the Poisson s ratio must be :(a) Zero{b) 025(c) 033(d) 05

T 400 MPa

What are the normal and shear stresses onthe 45 planes shown ?(a) a 1 = --cr = 400 MPa and 1: = 0(b) a 1 = a 2 = 400 MPa and 1: = 0(c) a 1=a = -400 MPa and 1: = 0(d) a 1 a2 =-r=200MPa



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33. Materials which show direction dependentprop


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41. Match List-1 with List-Il and select thecorrect answer using the code given belowthe lists :

List-A. Alpha ironB. ZincC. Glass

is -IlI FCC2. BCC3. HCP

D. Copper 4. AmorphousCode:

A B C D(a) 1 4 3 2(b) 2 4 3 I(c) 1 3 4 2(d) 2 3 4

42. n a triclinic unit cell :(a) u=l3=y=90(b) u = 3 = 90, y= 120(c) u=f3=90*Y(d) u ' 3 y 90

43. Structure of common glass is :(a) Amorphous(b) Partially crystalline(c) Fully crystalline(d) None of the above

44. Liquid+ solid (l) on cooling converting intosolid (2) reaction is knovm as :(a) Eutectoid reaction(b) Eutectic reaction(c) Peritectic reaction(d) Peritectoid reaction

7

45. Match List- with List-II and select thecorrect answer using the code given belowthe lists :

46.

47.

List- List-llA. System I Free energy is a

minimumB. Phase 2. Chemical ele-

ments or chemical compounds

C. Phase equili- 3. Consists of solids,brium liquids or gases or

their combinationD. Components 4. Homogeneous por

tion of a systemthat has uniformphysical characteristics

Code:A B

(a) 2 1(b) 3 I(c) 2 4(d) 3 4

C D4 34 2

3

Babbit is an alloy of:(a) Sn, Cu, Sb and Pb(b) Sn and Cu(c) Sn, Cu and Pb(d) Sn, Cu and SbResilience ofa material becomes importantwhen it is subjected to :(a) Fatigue(b) Thermal stresses(c) Shock loading(d) Pure static loading



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48. During tensile testing it has been observedthat for some material the deformation isfully recoverable and time-independent, butdoes not obey Hook's law. The material is :(a) Elastomer(b) Rubber(c) Polymer(d) Aluminium alloy

49. Match List- with List-11 and select thecorrect answer using the code given belowthe lists :

i s t ~ } List- 1A. Copper CorrosionB Nickel 2 Demagnetizationc Manganese 3 Non sparkingD. Vanadium 4. Deformation restriction

at high temperatureCode

A 8 ( 0a) I 2 3 4

(b) 4 3 2 Ic) 1 J 2 4

(d) 4 2 150. Match List with List-11 and select the

correct answer using the code given belowthe lists :

List-1 Ltst-JJA. Elasticity I. Deform non elastically

without fractureB. Malleability 2 l 1rxlergo plastic defonm-

tion under tensile loadC. Ductil ity 3 Urxlergo plastic defonrn-

tion under compres-sive load

D. Plasticity 4 Rt:tum to its originalshape on unloadingCode:

A 8 ( D{a) 2 3 4(b) 4 2 3(c) l 3 2 4(d) 4 3 2

51. The relationship between total freezing timet, volume of the casting V and its surfacearea A, according to Chvorinov's rule is :(a) t = K X)(b) t = K )(c) t K f(d) t K XfWhere K s a constant

52. Which one of the following statements isNOT correct for normalizing "(a) It is often applied to castings to relievestresses(b) It increases strength ofmedium carbonsteel to some extent(c) Better surface finish can b : obtainedin machining(d) It increases grain size

53. 'Whiskers' are :(a) Very thin metallic particlt:s(b) Very thin single crystals(c) Very thin polycrystals(d) Fiber particles of aspect ratio lessthan 10

54. Injection moulding process used to producethermoplastic matrix composites with fibrereinforcement normally gives ;(a) Short fibre composites(b) Two layer structure composites(c) Continuous fibre composites(d) Single layer composites

55. Aluminium Bronze is also known as :(a) Muntz metal(b) White metal(c) Duraluminium(d) Imitation gold

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56. Match List-1 with List-Il and select the 61. Which one of the following is the majorcorrect answer using the code given below alloying element in Invar ?the lists : a) Aluminium

List- List-II b) NickelA Gun metal l Worm wheel c) VanadiumB Phosphor bronze 2. Cylinder block d) Copperc Gray cast iron 3. Piston 62. In the designation of Aluminium castingD. AI alloy 4. Bushings ASI4 14 indicates:Code a) Aluminium purity

A B c b) Aluminium contenta) 3 l 2 4b) 4 1 2 3 c) Percentage of alloy elementc) 3 2 I 4 d) Magnesium contentd) 4 2 1 3 63. Columbium is a :

57. Lead is widely used in : a) Nuclear materiala) Transformers b) Automobile materialb) Switch gear c) Film materialc) Galvanized pipes d) Foam materiald) Batteries

58. Kevlar Epoxy composite is widely used in: 64. Consider the following statements :a) Automobiles 1. Any metal will require some time tob) Aerospace undergo complete plastic deformationc) Navy particularly if deforming metal has tod) Interior decoration fill cavities and comers of small radii.

59. Windows of aeroplane are made of: 2. For larger work piece ofmetals that cana) PVC retain toughness at forging temperatureb) PTFE it is preferable to use forge press ratherc) PMMA than forge hammer.d) PEEK a) I and 2 are correct and 2 is the reason60. Admirality Brass is used for : for Ia) Condenser tubes b) l and 2 are correct and I is the reasonb) Rivets forc) Piston rods c) I and 2 are correct but unrelatedd) Utensils d) I only correct

9 Contd.)

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65. Whtch of the following processes belong toforging operation ?I. Fullering2. Swaging3. Welding(a) 1 and 2 only(b) 2 and 3 only(c) I and 3 only(d) 1,2and3

66. Match List- with List-11 and select thecorrect answer using the code given belowthe lists :

List 1A. Connecting rodsB. Pressure vesselsC. Machine tool bedsD Collapsible tubesCode

A 8 C D(a) 2 1 4 3b) 3 t 4 2c) 2 4 I 3

td) 3 4 I 2

List 11l Welding2. Extrusion3. Forming4. Casting

67. Consider the tbllowing r;tatements :

\

I. Hot chamber machine is used forcasting zinc, tin and other low meltingalloys

2 Cold chamber machine is used for diecasting of ferrous alloys

3. Raptd cooling rate in die castingproduces high strength and quality inmany alloys

Which of these statements are correct ?(a) 1. 2 and 3(b) l and 2 only(c) 2 and 3 only(d) 1 and 3 only

1

68. Consider the following advantages of diecasting over sand cru.'ling :I Rapidity of the process2. Smooth surface3. Strong dense metal structureWhich of these advantages are correct?(a) I, 2and 3(b) I and 2 only(c) 2 and 3 only(d) I and 3 only

69. The proper sequence of investment casting~ e p s is:(a) Slurry coating Pattern melt out -

Shakeout Stucco coating(b) Stucco coating - Slurry coating -

Shakeout Pattern melt out(c) Slurry coating Stucco coating

Pattern melt out Shakeout(d) Stucco coating - Shakeout - Slurry

coating - Pattern melt out70. The methods of casting for producing

ornamental pieces are :(a) Slush and gravity castingb) Pressed and slush casting

(c) Gravity and semi permanent mouldcasting

d) Semi permanent mould and pressedcasting

71. In light metal castings, runner should be sodesigned that :I It avoids aspiration2. It avoids turbulence3 The path of runner is reduced in area

so that unequal volume of flow througheach gate takes place(a) I and 2 only(b) 1 and 3 only(c) 2 and 3 only(d) I, 2 and 3



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72. During plasma arc welding of aluminium, 75. Match List-I with List-II and select theimproved removal of he surface oxide from correct answer using the code given belowthe base metal is obtained with typical the lists:polarity of: List / List lla) DC straight A Laser beam I. Can be applied for

welding welding of refractoryb) DC reverse metals like niobium,c) AC potential tantalum,molybdenumd) Reverse polarity of phase of AC and tungsten

potential B. Electron beam 2 A sound and cleanwelding welded joint is crea-ted due to rubbing of

73. The welding process in which bare wire is two parts against eachused as electrode, granular flux is used and other with adequatethe process is characterized by its high speed speed and pressurewelding, is knoWn as : producing intensea) Shielded arc welding heat raising tempera-ture above meltingb) Plasma arc welding pointc) Submerged arc welding c Ultrasonic 3. Clean heat sourced) Gas metal arc welding welding created much awayfrom job, a narrow

spot is heated, work74. Consider the following statements. chamber operates inCast iron is difficult to weld, because of: a high vacuumI Low ductility D. Friction 4. Clean heat source,welding very quick heating,2. Poor fusion very small focal spot,3 Tendency to crack on cooling no vacuum chamberWhich of these statements are correct ? is requiredCode:a) 1,2and3 A B c Db) 1 and 2 only a) 4 3 l 2b) 2 3 1 4c) 2 and 3 only c) l 3 2d) 1 and 3 only d) 2 l 3

Contd.)www.examrace.co


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76. Cold-crncking in steel weldments depends on :1. Carbon equivalent2. Heat input3. Effective thickness4. Hydrogen content in weld pool(a) 1, 2 and 3 only(b) I. 2 and 4 only(c) 2, 3 and 4 only(d) I, 2, 3 and 4

77. In Norton type feed gearbox for cuttingWhitworth standard threads with a standardTPI Leadscn:w, power flows from :(a) Spindle to Tumbler gear to Norton

cone to Meander drive to Leadscrew(b) Spindle to Norton cone to Tumblergear to Meander drive to Leadscrew(c) Spindle to Tumbler gear to Meander

drive to Norton cone to Leadscrew(d) Spindle to Norton cone to Meander

drive to Tumbler gear to Leadscrew78. Match List- with List-11 and select the

correct answer using the code given belowthe lists:

79.

Li il-1A. LatheB. ShaperC. Drilling machineD. Milling machineCodeA B C D{a) 2 4 1 3(b) 3 4 I 2c)d) 3 I 4 3I 4 2

List IlI. Flute2. Universal

indexing3. Leadscrew4. Rocker arm

Trajectory of a robot means :(a) Path traced by the end effector(b) Kinematics of Robot(c) Robot joints(d) Robot programming

12

80. Typical coolants used for machiningaluminium are :1. Kerosene oil2. Soda water3. Air4. Paraffin oila} 1,2,3and4

(b) 2 and 3 only(c) I and 2 only(d) 3 and 4 only

81. The instrument or device used to measurethe cutting forces in machining is :(a) Tachometer(b) Comparator(c) Dynamometer(d) Lactometer

82. In a transportation problem, how is anunacceptable transportation route handled ?(a) By giving it a cost of zero(b) By carrying an extremely high cost(c) By introducing a dummy destination(d) By introducing a dummy origin

83. Consider the following characteristics :I. It is very sensitive to small movements

in the data2. The technique is simple3. The method is affected by the personal

prejudice of the peopleWhich of these characteristics of movingaverage method of forecasting are correct ?(a) I,2and3(b) l and 2 only(c) 2 and 3 only(d) 1 and 3 only



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84. The break-even p


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92 An unbound solution of a linearprogramming problem is reflected in thesimplex method, when :(a) All the ratio of right hand sides to

coefiicients in key column becomenegativeb) All the ratios of right hand sides tocoefficients in key columns becomezero

(c) All right hand sides become negatiw(d) All right hand sides become zero

93. When the ordering cost is increased to4 times, the EOQ will be increased to ;(a) 2 timesb) 3 ttmesc) 8 times

(d) Remain same

94. For a single server queue, the mean arrivalrate is equal to 8;hr and the mean servicerate is 12ihr. The expected number inwaiting lme is equal toa) OS

{b) 133c) 2d) 3

95. In the q u ~ u i n g theory, if the arrivals in asingk server model follow Poissondistribution, the time between arrivals willfollow a :(a) Gamma distribution(b) bxponential distribution(c) Binomial distribution(d) Weibull distribution

4

96. Which of he following are the advantagesof MOS devices over bipolar devices ?L basy to fabricate2. Allows higher bit densities3 Cost effectiw4. Operational speed.(a) 1, 2, 3 and 4{b) I. 2 and 3 onlyc) 2, 3 and 4 only

(d) I 3 and 4 only

97. The number ofRAM chips ofsize (256 kx I)required to build a 2 Mbyte memory is :a) 16b) 32c) 64

(d) 128

98. Refreshing circuit is requtred m :a) ROM

(b) Static RAM(c) Dynamic RAM(d) All of the above

99. Which of the following statemcnt(s) is/arecorrect?L Bus is a group of wires carrying

information2. Bus can carry data3. Bus cannot carry address4. A bus can be shared by more than onedevice(a) 1,2,3and4(b) I, 2 and 3 only(c) 1,2and4only(d) 2, 3 and 4 only



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l 00. In flowcharting, the connector symbol is a :a) Parallelogramb) Square

. c) Diamondd) Circle

I 0 I Which of the following are the advantagesof flowchart?I. A flowchart is independent oflanguage2. It is easy to develop a program with

flowchart3. If here are any changes in the program,

it is very easy to make changesa) I and 2 onlyb) 1 arid 3 onlyc) 2 and 3 onlyd) l, 2 and 3

102. In flowcharting, a parallelogram would beused to represent :a) Getting a keyboard entry from the userb) The beginning of the flowchartc) A decision point that determines which

of two branches to followd) A mathematical calculation

I 03. USM has good machining performance for:a) AIb) Steelc) Super alloysd) Refractory material

I 04. Consider the following statements :I Create a database alias2. Create the tables needed3 Create indexes4. Create a directory for the tablesWhat is the correct sequence of order forcreating a new database in dBase ?a) 4-2-I and 3b) 3-l-2and4c) 4-1-2 and 3d) 3-2-1 and 4

15

105. Match List-1 with List-II and select thecorrect answer using the code given belowthe lists :

List / List J/A Worksheet I dBase I l lB Records 2. C languagec Pointers 3. FORTRAND. Compiler 4 Lotus l-2-3Code:

A B c Da) 4 2 l 3b) 3 2 I 4c) 4 2 3d) 3 I 2 4

I 06. High energy rate forming process used forforming components from thin metal sheetsor deform thin tubes is :a) Petro-forming

{b) Magnetic pulse formingc) Explosive formingd) Electro-hydraulic forming

I 07. In the 3-2- I principle of fixture design,3 refers to number of:a) Setups possibleb) Clamps requiredc) Positions on primary faced) Locating positions

108. The optimum cutting speed is one whichshould have :I. High metal removal rate2. High cutting tool life3. Balance the metal removal rate andcutting tool life.a) I, 2 and 3b) l and 2 onlyc) 2 and 3 onlyd) 3 only

Contd.)www.examrace.co


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109. Stellitc is a non-ferrous cast alloycomposed of :(a) Cobalt, chromium and tungsten(b) Tungsten, vanadium and chromium(c) Molybdenum, tungsten and chromium(d) Tungsten. molybdenum, chromium

and vanadiumII 0. External threads can be produced by :

I Rolling2. Grinding3. Milling(a) I and 3 only(b) I and 2 only(c) 2 and 3 only(d) 1.2and3

Ill. Match List- with List-II and select thecorrect answer using the code given belowthe lists :

List- List-A Top gate l Heavy and large

castingsB. Bottom gate 2. Most widely used

and economicalC. Parting gate 3. TurbulenceD. Step gate 4. Unfavourable tern-

perature gradientCode:

A B c D(a} 3 4 2(b) I 4 2 3(c) 3 2 4(d) 2 4 3

6

DirectionsEach of the next Nine (9) items consistsof two statements, one labeled as the'Assertion {A)' and the other as Reason(R) . You are to examine these twostatements carefully and select the answersto these items using the codt. s given below:Codes:(a) Both A and R are indhidually true

and R is the correct explanation ofA

(b) Both A and R are individually truebut R is OT the correct explanationof A

(c) A is true but R is false(d) A is false but R is true

112. Assertion (A) The centrifugal tension ina belt is Tc - mv 2

Reason (R) Since this expression isindependent of the crosssection. it follows that T .is independent of the beltsize.

113. Assertion (A) Hot tears occur duringforging because ofinclusions in the blankmaterial.

Reason (R) Bonding between theinclusions and the parentmaterial is throughphysical and chemicalbonding.



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114. Assertion A) Lead, Zinc and tin arealways hot worked.

Reason R) If they are worked in coldstate they cannot retaintheirproperties. mechanical

II 5 Assertion A) Excess defects arecreated by hammering thecrystalline materials.

Reason R) The thermal fluctuationscreate the point defectsin crystalline materials.

116. Assertion A) Solid solutions of metalare crystals whoseproperties are close tothose of the solvent.

Reason R) They retain the samecrystal lattice and typ ofbond.

117. Assertion A) Carburizing is used formachine elements whichhave to have a wearresistant working surface.

Reason R) The composition ofsurface layers arechanged in carburizing.

17

118 . .Assertion A) The steel when heated

Reason R)

above a certaintemperature and cooledto room temperature,structure adjustmentstabilizes.The modification ismainly based on coolingrate.

119. Assertion A) The plastic organicmaterials can be easilyshaped or moulded bymechanical action.

Reason R) t is widely in use as itcan be permanentlymoulded.

120. Assertion A) A composite is amultiphase materialwhich is artificially madeas one that occursnaturally.

Reason {R) Technology of modernage requires a materialwith unusualcombination of propertiesthat cannot be met bymetal or alloys.

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