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.
Compressors
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.
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.
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.
The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.
Correct
Incorrect
✅ The correct answer is option A.
In a centrifugal compressor, an increase in speed at a given pressure ratio causes
increase in flow
decrease in flow
increase in efficiency
increase in flow and decrease in efficiency
✅ The correct answer is option D.
Intercooling in gas turbines
decreases net output but increases thermal efficiency
increases net output but decreases thermal efficiency
decreases net output and thermal efficiency both
increases net output and thermal efficiency both
✅ The correct answer is option B.
For a two stage reciprocating compressor, compression from p1 to p3 is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p2 is given by
p2 = (p1 + p3)/2
p2 = p1.p3
P2 = Pa x p3/p1
p2 = pa p3/p1
✅ The correct answer is option B.
The efficiency of a jet engine is higher at
low speeds
high speeds
low altitudes
high altitudes
✅ The correct answer is option D.