mechanical engineering MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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

181. One horsepower is equal to_________________?
0

A. 75 watts

B. 736 watts

C. 33000 watts

D. 550 watts

E. 102 watts

182. Maximum delivery pressure is a rotary air compressor is of the order of__________________?
0

A. 16 kg/cm2

B. 6 kg/cm2

C. 25 kg/cm2

D. 40 kg/cm2

E. 10 kg/cm2

183. Axial flow compressor resembles____________________ ?
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A. reciprocating pump

B. sliding vane compressor

C. none of the above

D. turbine

E. centrifugal pump

184. A neutral flame is obtained by supplying___________________?
0

A. none of the above

B. more volume of oxygen and less volume of acetylene

C. more volume of acetylene and less volume of oxygen

D. equal volumes of oxygen and acetylene

185. High air-fuel ratio is used in gas turbines______________________?
0

A. to reduce the exit temperature

B. none of the above

C. to increase the output

D. to increase the efficiency

E. to save fuel

186. The air-fuel ratio in gas turbines is of the order of ______________________?
0

A. 40:01:00

B. 7:01

C. 15:01

D. 30:01:00

E. 50: 1

187. Which place in hydraulic turbine is most susceptible for cavitation __________________?
0

A. penstock

B. inlet of draft rube

C. blade inlet

D. guide blade

E. draft tube exit

188. The specific speed of turbine is defined as the speed of a unit___________________?
0

A. of such a size that it produces unit horse power with unit head

B. none of the above

C. of such a size that it delivers unit dis-charge at unit power

D. of such a size that it delivers unit dis-charge at unit head

E. of such a size that it requires unit power per unit head

189. The thrust on the rotor in a centrifugal compressor is produced by________________?
0

A. resultant component

B. radial component

C. axial component

D. tangential component

190. The air entry velocity m a rocket as compared to aircraft is_________________?
0

A. zero

B. same

C. less

D. dependent on power and speed

E. more

191. The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?
0

A. unpredictable

B. higher

C. same

D. uncomparable

E. lower

192. Enriched uranium may contain fissionable contents of the order of__________________?
0

A. 1-99%

B. 1-50%

C. 1-90%.

D. 1-25%

E. 1-75%

193. The first unclear power plant in India is located at____________________?
0

A. Kalapakkam

B. Kota

C. Tarapur

D. Baraeilly

E. Kerala

194. The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called__________________?
0

A. pressure ratio

B. slip factor

C. degree of reaction

D. pressure coefficient

E. stage factor

195. Separators in compressor installations are located_____________________?
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A. after intercooler

B. between after-cooler and air receiver

C. before intercooler

D. after receiver

E. before suction

196. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
0

A. 68.80%

B. 39.20%

C. 84.8%

D. 91.6%.

E. 49.20%

197. More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?
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A. 2 kg/cm2

B. 6 kg/cm2

C. none of the above

D. 14.7 kg/cm2

E. 10 kg/cm2

198. In jet engines, paraffin is usually used as the fuel because of its _________________?
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A. high calorific value

B. low freezing point

C. ease of atomisation

D. A. and C. above

E. none of the above

199. The working fluid in ai turbine is___________________?
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A. in three phases

B. gas and no air

C. in a single phase

D. in two phases

E. in the form of air and water mixture

200. Gas turbine cycle with Regenerator __________________?
0

A. increases thermal efficiency

B. permits high moisture content fuel to be used

C. allows operation at very high altitudes

D. allows high compression ratio

E. decreases heat loss is exhaust

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