As the value of index ‘«’ is decreased, the volumetric efficiency will___________________?

A. Increase
B. Decrease
C. Remain unaffected
D. May increase/decrease depending on compressor clearance

The indicated work per unit mass of air delivered is___________________?

A. Directly proportional to clearance volume
B. Greatly affected by clearance volume
C. Not affected by clearance volume
D. Inversely proportional to clearance volume

The ratio of isentropic work to Euler work is known as_____________________?

A. Pressure coefficient
B. Work coefficient
C. Polytropic reaction
D. Slip factor

Phenomenon of choking in compressor means __________________?

A. No flow of air
B. Fixed mass flow rate regardless of pressure ratio
C. Reducing mass flow rate with increase in pressure ratio
D. Increased inclination of chord with air steam

Diffuser in a compressor is used to _____________________?

A. Increase velocity
B. Make the flow stream-line
C. Convert pressure energy into kinetic energy
D. Convert kinetic energy into pressure energy

For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________?

A. Centrifugal
B. Reciprocating
C. Axial
D. Screw

Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?

A. less power requirement
B. better mechanical balance
C. less loss of air due to leakage past the cylinder
D. more effective lubrication

For minimum work in multistage compression, assuming same index of compression in all stages_________________?

A. Work done in first stage should be more
B. Work done in subsequent stages should increase
C. Work done in subsequent stages should decrease
D. Work done in all stages should be equal

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

A. 0.1%
B. 0.5%
C. 1%
D. 5%

The criterion of the thermodynamic efficiency for rotary compressor is_________________?

A. Isentropic compression
B. Isothermal compression
C. Polytropic compression
D. Any one of the above