Exercise: Compressors Gas Dynamics And Gas Turbines

Questions for: Compressors Gas Dynamics And Gas Turbines

In a jet engine, the air-fuel ratio is
A:
30:1
B:
40:1
C:
50:1
D:
60:1
Answer: D
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Which one of the following is the effect of blade shape on performance of a centrifugal compressor ?
A:
Backward curved blades has poor efficiency
B:
Backward curved blades lead to stable performance
C:
Forward curved blades has higher efficiency
D:
Forward curved blades produce lower pressure ratio
Answer: D
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The multi-stage compression ofair as compared to single stage compression
A:
improves volumetric efficiency for the given pressure ratio
B:
reduces workdone per kg of air
C:
gives more uniform torque
D:
all of these
Answer: D
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Reheating in a multi-stage expansion gas turbine __________ compressor work.
A:
has no effect on
B:
decreases
C:
increases
D:
Answer: B
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The volumetric efficiency of a compressor
A:
constant with decrease in compression ratio
B:
decreases with decrease in compression ratio
C:
increases with increase in compression ratio
D:
decreases with increase in compression ratio
Answer: D
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