44) If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocatin

45) The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

46) The increase in pressure in a roots blower is entirely due to back flow of air.

47) The type of rotary compressor used in aeroplanes, is of

48) An axial compressor gives optimum performance at high speeds and large volume flows.