131. The type of rotary compressor used in aeroplanes, is of
centrifugal type
axial flow type
radial flow type
none of these
✅ The correct answer is option B.
Compressors, Gas Dynamics and Gas Turbines MCQs
132. Intercooling in multi-stage compressors is done
to cool the air during compression
to cool the air at delivery
to enable compression in two stages
to minimise the work of compression
✅ The correct answer is option D.
133. The type of rotary compressor used in gas turbines, is of
centrifugal type
axial flow type
radial flow type
none of these
✅ The correct answer is option B.
134. The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.
Correct
Incorrect
✅ The correct answer is option A.
135. High air-fuel ratio in gas turbines
increases power output
improves thermal efficiency
reduces exhaust temperature
do not damage turbine blades
✅ The correct answer is option C.
136. An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.
Yes
No
✅ The correct answer is option A.
137. The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
rotor to static enthalpy rise in the stator
stator to static enthalpy rise in the rotor
rotor to static enthalpy rise in the stage
stator to static enthalpy rise in the stage
✅ The correct answer is option C.
138. An aftercooler is used to
remove impurities from air
reduce volume of air
cause moisture and oil vapour to drop out
cool the air
✅ The correct answer is option C.
139. Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.
TRUE
FALSE
✅ The correct answer is option A.
140. Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.
Correct
Incorrect
✅ The correct answer is option A.