mechanical engineering MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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

241. The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?
0

A. 1.0%

B. 0.10%

C. 5%

D. 0.50%

E. 10%.

242. The angle of taper on draft tube is A. greater than 15 B. greater than 8 C. greater than 5 D. less than 8 E. less than 3.___________________?
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A. angle of taper on draft tube is

B. greater than 15

C. less than 3.

D. greater than 5

E. less than 8

F. greater than 8

243. Enriched uranium is one in which__________________?
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A. %age of U234 has been artificially in-creased

B. %age of U235 has been artificially in-creased

C. extra energy is pumped from outside

D. all impurities have been removed

E. %age of U has been artificially increased

244. The ratio of specific weighf/h.p. of gas turbin and I.C engines may be typically of the order of_______________________?
0

A. 2:01

B. 4:01

C. 1 : 6

D. 1:02

E. 1:01

245. In the cross compounding of the gas turbine plant__________________?
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A. h.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine

B. h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine

C. both the arrangements can be employed

D. all are connected in series

E. none of the above

246. The process by which a heavy nucleus is splitted into two light nuclei is known as_________________?
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A. chain reaction

B. splitting

C. fission

D. fusion

E. disintegration

247. Pick up the wrong statement about advantages of multistage compression____________________?
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A. mechanical balance is better

B. better lubrication is possible advantages of multistage

C. air can be cooled perfectly in between

D. more uniform torque, light cylinder and saving in work

E. more loss of air due to leakage past the cylinder

248. During base load operation, the best method of controlling compressor is ___________________?
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A. relief valve

B. variable speed

C. none of the above

D. start-stop motor

E. constant speed unloader

249. The thermal efficiency of a gas turbine as compared to a diesel plant is__________________?
0

A. unpredictably

B. more

C. same

D. depends on other factors

E. less

250. Fighter bombers use following type of engine __________________?
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A. turbo-propeller

B. ram-jet ,

C. turbo-jet

D. pulsojet

E. rocket

251. Which of the following nuclear reactor does not need a heat exchanger for generation of steam____________________?
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A. none of the above

B. liquid metal cooled

C. pressurised water

D. boiling water

E. gas cooled

252. The pressure ratio of an ideal vaned compressor with increase in mass flow rate_________________?
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A. first decreases and then increases

B. remains constant

C. unpredictable

D. increases

E. decreases

253. Mining industry usually employs following motive power___________________?
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A. petrol engine

B. compressed air

C. D.C. electric motor

D. diesel engine

E. A.C. electric motor

254. The mass number of a substance represents the sum of total number of___________________?
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A. protons and electrons in an atom

B. protons and neutrons in an atom

C. protons and neutrons in a nucleus

D. neutrons and electrons in an atom

E. protons and electrons in a nucleus

255. Electron-volt is the unit of________________?
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A. voltage

B. atomic power

C. energy

D. radio activity

E. there is no such unit.

256. It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ?
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A. it is bulky

B. it is inefficient

C. it requires cooling water for its operation

D. non of theses

257. Air-fuel ratio in a jet engine will be of the order of__________________?
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A. 20:01

B. 10:01

C. 100:00:00

D. 15:01

E. 60 : 1

258. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is________________?
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A. same

B. unpredictable

C. less

D. more

E. may be less or mote depending on size

259. The maximum number of jets generally employed in impulse turbine without jet interference is________________?
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A. 6

B. 8

C. 16

D. 12

E. 4

260. The main interest of shielding in nuclear reactor is protection against_______________?
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A. electrons

B. infra-red rays

C. X-rays

D. neutrons and gamma rays

E. a, P, and y rays

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