mechanical engineering MCQs – Page 11

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 Review each marked answer and report any item that may be outdated or unclear.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

201. Isotopes of same elements have___________________?
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A. different chemical properties and same atomic numbers

B. different masses and different atomic numbers

C. same chemical properties but different atomic numbers

D. same atomic number and different masses

E. same chemical properties and same atomic numbers

202. The ratio of isentropic work to Euler work is known as_____________________?
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A. slip factor

B. work coefficient

C. polytropic reaction

D. pressure coefficient

E. compressor efficiency

203. Ram-jet engine__________________?
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A. produces a jet consisting of plasma

B. is not self-operating at zero^flight speed

C. requires no air for its operation

D. is self-operating at zero flight speed

E. none of the above

204. In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?
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A. more

B. may be less or more depening upon speed

C. none of the above

D. less

E. same

205. Gas turbine works on______________?
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A. Joule cycle

B. Brayton or Atkinson cycle

C. Rankine cycle

D. Carnot cycle

E. Erricsson cycle

206. The risk of radioactive hazard is greatest in the turbine with following reactor___________________?
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A. all of the above.

B. liquid metal cooled

C. boiling water

D. gas cooled

E. pressurised water

207. The ratio of isentropic work to eulers work is known as _____________________?
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A. pressure coefficient

B. Eulers efficiency

C. pressure ratio

D. isentropic efficiency

E. compressor efficiency

208. Which of the following is the heaviest________________?
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A. neutron

B. atom

C. nucleus

D. electron

E. proton

209. The volumetirc efficiency of a compressor is calculated on the basis of __________________?
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A. volume at 20C and 1 kg/cm2

B. none of the above

C. volume of air inhaled at working conditions

D. volume of air inhaled at N.T.P. conditions

E. volume at 0C and 1 kg/cm2

210. Puck up the wrong statement about centrifugal pump_______________?
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A. head a diameter

B. Power a speed3

C. discharge a diameter

D. head a speed2

E. none of the above is wrong

211. The following property is most important for material used for gas turbine blade___________________?
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A. fatigue

B. corrosion resistance

C. toughness

D. creep

E. bulk modulus

212. The capacity of compressor will be highest when its intake temperature is___________________?
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A. highest

B. anything.

C. atmospheric

D. none of the above

E. lowest

213. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?
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A. isothermal

B. isentropic

C. isobaric

D. isochoric

E. adiabatic

214. The compression ratio in a gas turbine is of the roder of____________________?
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A. 8 : 1

B. 12:01

C. 20:01

D. 5:01

E. 3.5 : 1

215. The criterion of the thermodynamic efficiency for rotary compressor is_________________?
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A. isentropic compression

B. none of the above

C. any one of the above

D. polytropic compression

E. isothermal compression

216. Hydrogen is preferred as better coolant in comparison to C02 because former_____________________?
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A. is a good conductor

B. is inert

C. has high specific heat

D. all of the above

E. is lighter

217. A rocket engine for the combustion of its fuel_____________________?
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A. does not require oxygen

B. depends on electrical energy supplied by solar cells

C. carries its own oxygen

D. uses compressed atmospheric air

E. uses surrounding air

218. Low specific speed of turbine implies it is__________________?
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A. impulse turbine

B. propeller turbine

C. none of the above

D. Francis turbine

E. any one of the above

219. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?
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A. there is no such criterion

B. less

C. same

D. more

E. none of the above

220. For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________?
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A. pressure ratio alone

B. maximum cycle temperature alone

C. minimum cycle temperature alone

D. both pressure ratio and maximum cycle temperature

E. none of the above

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