60) The air is delivered __________ in one revolution in case of a three-lobbed rotor.

61) The performance of air compressor at high altitudes will be __________ as compared to that at sea level.

62) In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

63) In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.

64) In gas turbines, the work input with intercooling is __________ the work input with no intercooling.