Ratio of compression is the ratio of__________________?

A. Gauge discharge pressure to the gauge intake pressure
B. Absolute discharge pressure to the ab-solute intake pressure
C. Pressures at discharge and suction cor-responding to same temperature
D. Stroke volume and clearance volume

Volumetric efficiency is_____________________?

A. The ratio of stroke volume to clearance volume
B. The ratio of the air actually delivered to the amount of piston displacement
C. Reciprocal of compression ratio
D. Index of compressor performance

Volumetric efficiency of a compressor without clearance volume________________?

A. Increases with increase in compression ratio
B. Decreases with increase in compression ratio
C. Is not dependent upon compressin ratio
D. May increase/decrease depending on compressor capacity

Volumetric efficiency of air compressors is of the order of________________?

A. 20-30%
B. 40-50%
C. 60-70%
D. 70-90%

Cylinder clearance in a compressor should be _________________?

A. As large as possible
B. As small as possible
C. About 50% of swept volume
D. About 100% of swept volume

Ratio of indicated H.P. and brake H.P. is known as_________________?

A. Mechanical efficiency
B. Volumetric efficiency
C. Isothermal efficiency
D. Adiabatic efficiency

Aeroplanes employ following type of compressor_______________?

A. Radial flow
B. Axial flow
C. Centrifugal
D. Combination of above

Compression efficiency is compared against_____________________?

A. ideal compression
B. adiabatic compression
C. botii isothermal and adiabatic compression
D. isentropic compression

An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?

A. One adiabatic, two isobaric, and one constant volume
B. Two adiabatic and two isobaric
C. Two adiabatic, one isobaric and one constant volume,
D. One adiabatic, one isobaric and two constant volume

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