railway RRB JE (CBT I + CBT II) Mock Test 2024 Power Engineering Air and Gas Compressors Centrifugal Compressors
The polytropic efficiency of rotary compressor is
1
\(\left(\dfrac{n}{n-1}\right)\left(\dfrac{\gamma}{\gamma-1}\right)\)
2
\(\left(\dfrac{n}{n-1}\right)\left(\dfrac{\gamma-1}{\gamma}\right)\)
3
\(\left(\dfrac{n-1}{n}\right)\left(\dfrac{\gamma}{\gamma-1}\right)\)
4
\(\left(\dfrac{n-1}{n}\right)\left(\dfrac{\gamma-1}{\gamma}\right)\)