mechanical engineering MCQs – Page 51

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

1001. Calorie is a measure of
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A. entropy

B. quantity of heat

C. thermal capacity

D. specific heat

E. work

1002. The magnitude of tangential acceleration is equal to____________________?
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A. (velocity/crankradius)

B. velocityvcrankradius

C. velocity2 x crank radius

D. none of the above

E. velocity x crank radius2

1003. Typewriter constitutes__________________?
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A. mechanism

B. none of the above

C. inversion

D. machine

E. structure

1004. Carnot cycle is__________________?
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A. a reversible cycle (ft) an irreversible cycle

B. a semi-reversible cycle

C. a quasi static cycle

D. an adiabatic irreversible cycle

1005. The frequency of oscillation at compared to earth will be___________________?
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A. 6 times more

B. 36 times less

C. 6 times less

D. 2.44 times more

E. 2.44 times,less

1006. In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________________________?
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A. 45 mm

B. none of the above

C. slightly more than 95 mm

D. 95 mm

E. slightly less than 95 mm

1007. A sudden fall in the barometer reading is a sign of approaching________________?
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A. rains

B. hot wave

C. cold wave

D. storm

E. fine weather

1008. Heat and work are ____________________?
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A. system properties

B. path functions

C. intensive properties

D. extensive properties

E. point functions

1009. Angle of action of cam is defined as the angle ____________________?
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A. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

B. during which the follower returns to its initial position

C. of rotation of the cam for a definite displacement of the follower

D. moved by the cam from beginning of ascent to the termination of descent

E. through which the cam rotates during the period in which the follower remains in the highest position

1010. For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?
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A. there is no such criterion

B. zero

C. infinity

D. maximum

E. minimum

1011. Instantaneous center of rotation of a link in a four bar mechanism lies on _______________?
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A. right side pivot of this link

B. a point obtained by intersection on extending adjoining links

C. cant occur

D. none of the above

E. lift side pivot of this link

1012. The number of centers in a crank driven slider crank mechanism are_______________?
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A. 6

B. 0

C. 4

D. may be any number depending upon position of mechanism

E. 2

1013. Kleins construction is useful to determine__________________?
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A. acceleration of various parts

B. all of the above

C. velocity of various parts

D. angular acceleration of various parts

E. displacement of various parts

1014. A perpetual motion machine is___________________?
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A. a non-thermodynamic machine

B. a thermodynamic machine

C. an inefficient machine

D. a hypothetical machine whose opera-tion would violate the laws of thermodynamics

E. a hypothetical machine

1015. The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?
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A. 29.27 J/kmolK

B. 735 J/kmol K

C. 848J/kmolK

D. All J/kmol K

E. 83.14J/kmolK

1016. First law of thermodynamics___________________?
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A. enables to determine change in internal energy of the system

B. provides relationship between heat, work and internal energy

C. does not enable to determine change in entropy

D. does not help to predict whether the system will or not undergo a change

E. all of the above

1017. Cylindrical cams can be classified as_________________?
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A. circular

B. tangent

C. reciprocating

D. none of the above

E. all of the above

1018. If value of n is infinitely large in a polytropic process pV = C, then the process is known as constant_____________________?
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A. entropy

B. volume

C. temperature

D. enthalpy

E. pressure

1019. An engine operates between temperatures of 900Kandr2 and another engine between T2 and 400K For both to do equal work, value of T2 will be________________?
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A. 650K

B. 600K

C. 700K

D. 625K

E. 750K

1020. A cam mechanism imparts following motion___________________?
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A. none of the above

B. all of the above

C. reciprocating

D. rotating

E. oscillating

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