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25.

Losses in a centrifugal compressor are due to

A.	inlet losses	B.	impeller channel losses
C.	diffuser losses	D.	all of the above

26.

Mining industry usually employs following motive power

A.	A.C. electric motor	B.	compressed air
C.	petrol engine	D.	diesel engine

27.

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

A.	2 kg/cm2	B.	6 kg/cm2
C.	10 kg/cm2	D.	14.7 kg/cm2

28.

Out of the following, from where you will prefer to take intake for air compressor

A.	from an air conditioned room maintained at 20°C	B.	from outside atmosphere at 1°C
C.	from coal yard side	D.	from a side where cooling tower is located nearby

29.

Pick up the wrong statement about advantages of multistage compression

A.	better lubrication is possible advantages of multistage	B.	more loss of air due to leakage past the cylinder
C.	mechanical balance is better	D.	air can be cooled perfectly in between

30.

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

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