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

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

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

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

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

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

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

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 advantage of multistage compression over single stage compression is ________________?

A. lower power consumption per unit of air delivered
B. higher volumetric efficiency
C. decreased discharge temperature
D. mositure free air

In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to ____________________?

A. N.t.p. conditions
B. Intake temperature and pressure conditions
C. 0°c and 1 kg/cm2
D. 20°c and 1 kg/cm2

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

A. 0.1%
B. 0.5%
C. 1.0%
D. 5%

During base load operation, the best method of controlling compressor is ___________________?

A. Start-stop motor
B. Constant speed unloader
C. Relief valve
D. Variable speed