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49.

The thermodynamic efficiency of rotary compressor is based on

A.	isothermal compression	B.	adiabatic compression
C.	isentropic compression	D.	polytropic compression

50.

The thrust on the rotor in a centrifugal compressor is produced by

A.	radial component	B.	axial component
C.	tangential component	D.	resultant component

51.

The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

A.	0.10%	B.	0.50%
C.	1.00%	D.	5%

52.

The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

A.	0.10%	B.	0.50%
C.	1%	D.	5%

53.

The volumetric efficiency of a compressor is calculated on the basis of

A.	volume of air inhaled at working conditions	B.	volume of air inhaled at N.T.P. conditions
C.	volume at 0°C and 1 kg/cm2	D.	volume at 20°C and 1 kg/cm2

54.

The work done per unit mass of air in compression will'be least when n is equal to

A.	1	B.	1.2 ,
C.	1.3	D.	1.4

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