mechanical engineering MCQs – Page 164

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 Review each marked answer and report any item that may be outdated or unclear.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

3261. For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?
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A. about 1.7 times

B. about 0.5 times

C. about twice

D. nearly equal

E. about 5 times

3262. The cooling water requirement for diesel engine is of the order of________________?
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A. 10 to 20 liters per minute per h.p.

B. 5 to 10 liters per minute per h.p

C. 1 to 3 liters per minute per h.p.

D. 20-30 liters per minute per h.p

E. 0.2 to 1.0 liter per minute per h.p.

3263. The precess of breaking up or a lipuid into fine droplets by spraying is called___________________?
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A. ionisation

B. injection

C. atomisation

D. vaporisation

E. carburetion

3264. The pressure at the end of compression in the case of diesel engine is of the order of___________________?
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A. 27.5 kg/cmz

B. 20 kg/cmz

C. 12kg/cmz

D. 6 kg/cm

E. 35 kg/cm

3265. A 75 cc engine has following parameter as 75 cc ___________________?
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A. clearance volume

B. lub oil capacity

C. fuel tank capacity

D. cylinder volume

E. swept volume

3266. With increase in speed of vehicle, the back pressure will________________?
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A. depend on other factors

B. remain unalfected

C. none of the above

D. increase

E. decrease

3267. Self-ignition temperature of petrol is of the order of___________________?
0

A. 450C

B. 370C

C. 240C

D. more than 500C.

E. 150C

3268. Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?
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A. unpredictable

B. increases.

C. remains same

D. none of the above

E. decreases

3269. Theoretically, the following engine should have maximum efficiency________________?
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A. steam engine

B. 2-stroke S.I. engine

C. gas engine

D. 4-stroke C.I. engine

E. 4-stroke S.I. engine

3270. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
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A. more

B. less or more depending on operating conditions

C. less

D. unpredictable

E. same

3271. The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?
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A. 1500 rpm

B. any value independent of engine speed

C. 750 rpm

D. none of the above

E. 3000 rpm

3272. In order to prevent knock in the S.I. engines, the charge away from the spark plug should have___________________?
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A. rich mixture

B. all of the above

C. low density

D. long ignition delay

E. low temperature

3273. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?
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A. not true

B. true at full load

C. true at part load

D. true at both part and full load

E. there could not be any such criterion

3274. The accunmulation of carbon in a cylinder results in increase of________________?
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A. volumetric efficiency

B. effective compression ratio

C. valve travel time.

D. clearance volume

E. ignition time

3275. The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
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A. decrease linearly

B. increase linearly

C. increase parabolically

D. first decrease linearly and then increase parabolically

E. decrease parabolically

3276. In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
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A. more/less depending on engine capacity.

B. more

C. less

D. same

E. variable

3277. For low load operation, more suitable (economical) engine is_______________?
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A. S.I. engine

B. C.I. engine

C. both are equally good

D. multicylinder engine

E. two stroke engine

3278. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?
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A. cycle efficiency

B. efficiency ratio

C. relative efficiency

D. overall efficiency

E. net efficiency

3279. Most high speed compression engines operate on ___________________?
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A. Two stroke cycle

B. Dual cycle

C. Otto cycle

D. Diesel cycle

E. Carnot cycle

3280. Most high speed compression engines operate on __________________?
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A. Diesel cycle

B. Carnot cycle

C. Otto cycle

D. Dual combustion cycle

E. Special type of air cycle

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