54) Workdone by an air compressor __________ upon the way in which the air is compressed.

55) In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.

56) Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.

57) The mass of gas turbine per kW developed is about __________ as that of an I.C. engine.

58) In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.