90) In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.

91) Euler's equation can be used for

92) A rocket engine uses __________ for the combustion of its fuel.

93) The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.

94) In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.