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
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 teh above
The volumetric efficiency of a compressor
A. increases 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
The efficiency of the vane blower is (where W1 = Workdone due to compression, and W2= Workdone due to back flow)
A.
B.
C.
D.
Answer B
The volume of air sucked by the compressor during its suction stroke is called
A. free air delivery
B. compressor capacity
C. swept volume
D. None of the above
Answer C
