mechanical engineering MCQs – Page 113

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 Review each marked answer and report any item that may be outdated or unclear.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

2241. Turbo propeller has the following additional feature over the turbojet __________________?
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A. intercooler

B. peopeller

C. diffuser

D. starting engine

E. turbine and combustion chamber

2242. To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?
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A. any location

B. bottom side of main

C. top side of main

D. left side of main

E. right side of main

2243. Volumetric efficiency of a compressor with clearance volume ________________?
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A. decreases with increase in compression ratio

B. may increase/decrease depending on compressor capacity

C. in not dependent upon compression ratio

D. increases with increase in compression ratio

E. unpredictable

2244. Gas turbine cycle with Regenerator __________________?
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A. permits high moisture content fuel to be used

B. decreases heat loss is exhaust

C. allows operation at very high altitudes

D. increases thermal efficiency

E. allows high compression ratio

2245. The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?
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A. same

B. less

C. unpredictable

D. more/less depending on compressor capacity

E. more

2246. The capacity of a compressor is 5 m /mih. 5 m /min refers to_______________?
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A. free air

B. air sucked

C. standard air

D. compressed air at delivery pressure

E. compressed air

2247. Pressure ratio in gas turbines is the ratio of ____________________?
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A. inlet pressure to exhaust pressure

B. compressor pressure ratio

C. pressures across the turbine

D. highest pressure to exhaust pressure

E. none of the above

2248. Ratio of indicated H.P. and brake H.P. is known as_________________?
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A. mechanical efficiency

B. relative efficiency

C. adiabatic efficiency

D. isothermal efficiency

E. volumetric efficiency

2249. The closed cycle in gas turbines_________________?
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A. in never used

B. is used when gas is to be burnt

C. provides greater flexibility

D. provides lesser flexibility

E. none of the above

2250. Volumetric efficiency of a compressor without clearance volume________________?
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A. may increase/decrease depending on compressor capacity

B. is not dependent upon compressin ratio

C. unpredictable

D. decreases with increase in compression ratio

E. increases with increase in compression ratio

2251. The jnaximum combustion pressure in gas turbine as compared to I.C. engine is_________________?
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A. less

B. unpredictable

C. more

D. same

E. depends on other factors

2252. In which case the air-fuel ratio is likely to be maximum _________________?
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A. 2-stroke engine

B. gas turbine

C. 4-stroke diesef engine

D. multi-cylinder engine

E. 4-stroke petrol engine

2253. Axial flow compressor has the following advantage over centrifugal compressor__________________?
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A. none of the above

B. aerofoil blades are used

C. higher average velocities

D. larger air handling ability per unit frontal area

E. higher pressure ratio per stage

2254. In jet propulsion power unit, the inlet duct of diverging shape is used in order to _______________ ?
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A. provide robust structure

B. collect more air

C. beautify the shape

D. convert kinetic energy of air into pres-sure energy

E. none of the above

2255. Gas turbines for power generaion are normally used___________________?
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A. when other sources of power fail

B. in emergency

C. to enable start thermal power plant

D. to supply peak load requirements

E. to supply base load requirements

2256. Pick up the correct statement ?
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A. gas turbine uses low air-fuel ratio to develop the high thrust required

B. gas turhine uses high air-fuel ratio to reduce outgoing temperature

C. gas turbine uses low air-fuel ratio to economise on fuel

D. none of the above

E. all of the above

2257. Isothermal compression effeicency can be attained by running the compressor__________________?
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A. at very high speed

B. at zero speed

C. at average speed

D. isothermally

E. at very slow speed

2258. Ratio of compression is the ratio of__________________?
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A. pressures at discharge and suction cor-responding to same temperature

B. none of the above

C. absolute discharge pressure to the ab-solute intake pressure

D. gauge discharge pressure to the gauge intake pressure

E. stroke volume and clearance volume

2259. The compressor efficiecny is the__________________?
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A. isothermal H.P/indicated H.R

B. total output/air input

C. none Of the above

D. compression work/motor input

E. isothermal H.P./shaft H.R

2260. The compression ratio in a jet engine varies proportional to ____________________?
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A. speed

B. altitude

C. speed

D. Vspeed

E. does not Vary

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