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19.

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

20.

In multistage compressor, the isothermal compression is achieved by

A.	employing intercooler	B.	by constantly cooling the cylinder
C.	by running compressor at very slow speed	D.	by insulating the cylinder

21.

Inter cooling in compressors

A.	cools the delivered air	B.	results in saving of power in compressing a given volume to given pressure
C.	is the standard practice for big compressors	D.	enables compression in two stages

22.

Isothermal compression efficiency can be attained by running the compressor

A.	at very high speed	B.	at very slow speed
C.	at average speed	D.	at zero speed

23.

Isothermal compression efficiency, even when running at high speed, can be approached by using

A.	multi-stage compression	B.	cold water spray
C.	both (a) and (b) above	D.	fully insulating the cylinder

24.

Isothermal compression though most efficient, but is not -practicable because

A.	it requires very big cylinder	B.	it does not increase pressure much
C.	it is impossible in practice	D.	compressor has to run at very slow speed to achieve it

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