For a multistage compressor, the polytropic efficiency is:

1.	For a multistage compressor, the polytropic efficiency is:
A.	The efficiency of all stages combined together
B.	The efficiency of one stage
C.	Constant throughout for all the stages.
D.	A direct consequence of the pressure ratio.
Answer» D. A direct consequence of the pressure ratio.

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For a multistage compressor, the polytropic efficiency is:

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