mechanical engineering MCQs – Page 114

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 Review each marked answer and report any item that may be outdated or unclear.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

2261. In the cross compounding of the gas turbine plant__________________?
0

A. h.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine

B. h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine

C. both the arrangements can be employed

D. all are connected in series

E. none of the above

2262. Cylinder clearance in a compressor should be _________________?
0

A. as small as possible

B. as large as possible

C. about 100% of swept volume

D. about 50% of swept volume

E. none of the above

2263. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?
0

A. isobaric

B. adiabatic

C. isothermal

D. isentropic

E. isochoric

2264. A jet engine works on the principle of conservation of____________________?
0

A. mass

B. energy

C. angular momentum

D. linear momentum

E. flow

2265. To aviod moisture troubles, the compressed air main line should __________________?
0

A. none of the above

B. be laid vertically

C. drop gradually towards the point of use

D. rise gradually towards the point of use

E. be laid exactly horizontally

2266. The efficiency of jet engine is__________________?
0

A. lower at low speed

B. higher at high speed

C. higher at ground

D. higher at high altitudes

E. same at all altitudes

2267. An air compressor may be controlled by____________________?
0

A. none of the above

B. any one of the above

C. blow-off control

D. throttle control B. clearance control

2268. Aeroplanes employ following type of compressor_______________?
0

A. centrifugal

B. radial flow

C. none of the above

D. axial flow

E. combination of above

2269. In jet engines the products of combustion after passing through the gas lurbine are discharged into_______________?
0

A. none of the above

B. atmosphere

C. vacuum

D. back to the compressor

E. discharge nozzle

2270. The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?
0

A. velocity coefficient

B. slip factor

C. velocity factor

D. blade effectiveness

2271. For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________?
0

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

2272. Rotary compressors are suitable for ____________________?
0

A. low discharge at low pressure

B. large discharge at low pressure

C. large discharge at high pressure

D. low discharge at high pressure

E. there is no such limitation

2273. A simple turbo-jet engine is basically_________________?
0

A. ram-jet enigne

B. a propeller system

C. chemical rocket regine

D. gas-turbine engine equipped with a propulsive nozzle and diffuse*

E. none of the above

2274. Which is false statement about air receivers ___________________?
0

A. These are used to dampen pulsations ,

B. These increase compressor efficiency

C. These knock out some oil and moisture

D. These act as reservoir to- take care of sudden demands

E. These reduce frequent on/off operation of compressors

2275. Work ratio of a gas turbine may be improved by f____________________?
0

A. decreasing the compression work

B. decreasing the turbine work

C. increasing the turbine work

D. A. and C. above

E. increasing the compression work

2276. Eulers equation is applicable for__________________?
0

A. none of the above

B. pumps

C. all of the above

D. centrifugal compressor

E. axial compressor

2277. In air breathing jet engine, the jet is formed by expanding__________________?
0

A. highly heated atmospheric air

B. solids

C. plasma

D. liquid

E. gases

2278. The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?
0

A. lower

B. higher

C. same

D. uncomparable

E. unpredictable

2279. The working fluid in ai turbine is___________________?
0

A. in three phases

B. in a single phase

C. in the form of air and water mixture

D. in two phases

E. gas and no air

2280. The work ratio of a gas turbine plant is defined as the ratio of__________________?
0

A. net work output and isentropic heat drop

B. net work output and heat supplied (6) net work output and work done by turbine

C. isentropic increase/drop in temperature and actual increase/ drop in temperature

D. actual heat drop and isentropic heat drop

Previous Next

Showing 2261 to 2280 of 4266 mcqs