mechanical engineering MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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

221. In multistage compressor, the isothermal compression is achieved by_________________?
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A. employing intercooler

B. by insulating the cylinder

C. none of the above

D. by constantly cooling the cylinder

E. by running compressor at very slow speed

222. For a compressor, least work will be done if the compression is________________ ?
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A. isothermal

B. none of the above

C. polytropic

D. isentropic

E. somewhere in between isentropic and isothermal

223. The total energy released in fission of U is__________________?
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A. 10 MeV

B. 199 MeV

C. 11 MeV

D. 5 MeV

E. 168 MeV

224. A reactor capable of converting a ferrite material into fissile isotopes is called____________________?
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A. ferrite reactor

B. regenerative reactor

C. breeder reactor

D. boiling water reactor

E. fast breeder reactor

225. Ideally the neutron flux in reactor should be__________________ ?
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A. maximum at side and zero in center

B. none of the above

C. maximum in center and zero at side

D. uniform throughout

E. zero throughout

226. In a centrifugal pump, the liquid enters the pump__________________?
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A. at the center

B. at the top

C. none of the above

D. at the bottom

E. from sides

227. The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?
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A. low/high depending on make and type

B. unpredictable

C. same

D. high

E. low

228. As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?
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A. decreases

B. increases

C. first decreases and then increases

D. remains same

E. first increases and then decreases

229. A jet engine works on the principle of conservation of____________________?
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A. energy

B. mass

C. flow

D. angular momentum

E. linear momentum

230. A simple turbo-jet engine is basically_________________?
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A. gas-turbine engine equipped with a propulsive nozzle and diffuse*

B. none of the above

C. chemical rocket regine

D. a propeller system

E. ram-jet enigne

231. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?
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A. inversely as density

B. directly as the air or gas density

C. as square root of density

D. as square of density

E. inversely as square root of density

232. Moderator in nuclear plants is used to__________________?
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A. control the reaction

B. extract heat from nuclear reaction

C. reduce temperature

D. moderate the radioactive pollution

E. cause collision with the fast moving neutrons to reduce their speed

233. Maximum impulse will be developed in hydraulic ram when ___________________?
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A. supply pipe is long

B. supply pipe is short

C. waste valve closes suddenly

D. supply pipe has critical diameter

E. ram chamber is large

234. The efficiency of jet engine is__________________?
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A. higher at high altitudes

B. higher at ground

C. lower at low speed

D. higher at high speed

E. same at all altitudes

235. Tandem drawing of wires and tubes is necessary because_________________?
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A. annealing is needed between stages

B. accuracy in dimensions is not possible otherwise

C. it is not possible to reduce at one stage

D. surface finish improves after every drawing stage

236. Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?
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A. forced spiral vortex flow

B. rotational flow

C. radial

D. spiral vortex flow

E. forced cylindrical vortex flow

237. The work ratio of simple gas turbine cycle depends on_________________?
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A. pressure ratio

B. minimum cycle temperature

C. maximum cycle temperature

D. all of the above

E. none of die above

238. The vloumetric efficiency of compressor with increase in compression ratio will ___________________?
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A. increase

B. none of the above

C. may increase/decrease depending on clearance volume

D. remain same

E. decrease

239. In the aircraft propellers __________________?
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A. the propulsive matter is caused to flow around the propelled body

B. its functioning does not depend on presence of air

C. propulsive matter is ejected from within the propelled body

D. all of the above

E. none of the above

240. In axial flow fans and turbines, fluid enters and leaves as follows________________?
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A. combination of axial and radial

B. radially, axially

C. axially, axially

D. radially, radially

E. axially, radially

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