For minimum work required to compress and deliver a quantity of air by multistage compression

The compression ratio in each stage should be same

The intercooling should be perfect

The work-done in each stage should be same

For minimum work required to compress and deliver a quantity of air b

1.	For minimum work required to compress and deliver a quantity of air by multistage compression
A.	The compression ratio in each stage should be same
B.	The intercooling should be perfect
C.	The work-done in each stage should be same
D.	All of the above
Answer» E.