Exercise: Compressors Gas Dynamics And Gas Turbines

Questions for: Compressors Gas Dynamics And Gas Turbines

Reheating in a gas turbine
A:
increases the thermal efficiency
B:
increases the compressor work
C:
increases the turbine work
D:
decreases the thermal efficiency
Answer: A
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If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
A:
D1/D2 = (p1p3)1/2
B:
D1/D2 = (p1/p3)1/4
C:
D1/D2 = (p1p3)1/4
D:
D1/D2 = (p3/p1)1/4
Answer: D
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The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
A:
rotor to static enthalpy rise in the stator
B:
stator to static enthalpy rise in the rotor
C:
rotor to static enthalpy rise in the stage
D:
stator to static enthalpy rise in the stage
Answer: C
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In a reciprocating air compressor, the compression work per kg of air
A:
increases as clearance volume increases
B:
decreases as clearance volume increases
C:
is independent of clearance volume
D:
increases as clearance volume decreases
Answer: C
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An axial compressor gives optimum performance at high speeds and large volume flows.
A:
Agree
B:
Disagree
C:
D:
Answer: A
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