83) The pressure ratio in a centrifugal compressor can be increased by increasing the tip speed and lowering the inlet temperature.

84) Free air is the air at atmospheric conditions at any specific location.

85) A gas turbine used in air-craft should have low weight and small frontal area.

86) A closed cycle gas turbine works on

87) The clearance, in a single stage, single acting reciprocating air compressor does not effect the workdone on the air and the power required for compressing the air.