Compressors, Gas Turbines and Jet Engines
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 pressure is pa, then the intermediate pressure p₂ is given by

P₂ = Pa × p₃/p₁
p₂ = (p₁ + p₃)/2
p₂ = Pa p₃/p₁
p₂ = p₁. p₃

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Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct relating to rocket engines?

The exit velocities of exhaust gases are much higher than those in jet engine
The stagnation conditions exist at the combustion chamber
The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel
All of these

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