Compressors Gas dynamics and Gas Turbines MCQ with Answers

Inlet pressure is the absolute pressure of air at the inlet of a compressor. The inlet pressure is always less than the discharge pressure.

Discharge pressure is the absolute pressure of air at the outlet of a compressor.

Compression ratio or Pressure ratio is the ratio of discharge pressure to the inlet pressure. Since the discharge pressure is always more than the inlet pressure, therefore the compression ratio is more than unity.

16) Intercooling in multi-stage compressors is done

to minimise the work of compression

17) For a two stage reciprocating compressor, compression from p1 to p3 is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressu

p2 = p1.p3

18) The ratio of workdone per cycle to the stroke volume of the compressor is known as

mean effective pressure

19) The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.

Correct

20) The inlet pressure is always __________ the discharge pressure.

less than

17) For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressu

p₂ = p₁.p₃