compressors gas turbines and jet engines MCQs – Page 7

Practise focused compressors gas turbines and jet engines questions with marked answers for exam preparation and subject revision.

compressors gas turbines and jet engines Mcqs

121. Ratio of compression is the ratio of__________________?
0

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

122. The compressor efficiecny is the__________________?
0

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

123. The compression ratio in a jet engine varies proportional to ____________________?
0

A. speed

B. altitude

C. speed

D. Vspeed

E. does not Vary

124. 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

125. 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

126. 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

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

A. mass

B. energy

C. angular momentum

D. linear momentum

E. flow

128. 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

129. 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

130. 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

131. Aeroplanes employ following type of compressor_______________?
0

A. centrifugal

B. radial flow

C. none of the above

D. axial flow

E. combination of above

132. 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

133. 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

134. 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

135. 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

136. 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

137. 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

138. 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

139. Eulers equation is applicable for__________________?
0

A. none of the above

B. pumps

C. all of the above

D. centrifugal compressor

E. axial compressor

140. 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

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