133) The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.

134) A centrifugal compressor is an axial flow compressor.

135) A compressor must be driven by some prime mover.

136) Volumetric efficiency of a compressor decreases with __________ in compression ratio.

137) The speed of rotary air compressor is __________ as compared to reciprocating air compressor.