mechanical engineering MCQs – Page 19

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 Review each marked answer and report any item that may be outdated or unclear.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

361. Forces are called concurrent when their lines of action meet in________________?
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A. two points

B. one point

C. plane

D. different planes

E. perpendicular planes

362. A fast breeder reactor__________________?
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A. uses ferrite material as moderator

B. has powerful moderator

C. has no moderator

D. uses graphite rods as moderator

E. uses pressurised water as moderator

363. In vapor compression cycle the condition off refrigerant is dry saturated vapor________________?
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A. before entering the expansion valve

B. after passing through the condenser

C. before passing through the condenser

D. before entering the compressor

E. after passing through the expansion or throttle valve

364. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?
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A. 0.45

B. 0.75

C. 0.55

D. 0.6

E. 0.4

365. Log mean temperature difference in case of counter flow compared to parallel flow will be________________?
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A. less

B. depends on other factors

C. more

D. none of the above

E. same

366. A pressurised water reactor employs pressuriser for the following application________________?
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A. all of the above

B. to provide subcooled water at high pressure

C. to increase pressure of water in primary circut

D. to maintain constant pressure in primary circuit under varying load

E. to Supply high pressure steam

367. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of_______________?
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A. friction

B. kinematic friction

C. repose

D. limiting friction

E. static friction

368. The co-efficient of friction depends upon_______________?
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A. shape of the surfaces

B. nature of surfaces

C. ail of the above.

D. A. and B. above

E. area of contact

369. According to law of triangle of forces __________________ ?
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A. three forces acting at a point can be represented by a triangle, each side being proportional to force

B. if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

C. three forces acting at a point will be in equilibrium

D. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

E. none of the above

370. According to Prevost theory of heat exchange ___________________?
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A. all bodies above absolute zero emit radiation

B. heat transfer in most of the cases takes place by combination of conduction, convection and radiation

C. rate of heat transfer depends on thermal conductivity and temperature difference

D. it is impossible to transfer heat from low temperature source to t high temperature source

E. heat transfer by radiation requires no medium

371. The relative coefficient of performance is_____________________?
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A. theoretical COP/actual COP

B. actual COP x theoretical COP