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55.

To aviod moisture troubles, the compressed air main line should

A.	rise gradually towards the point of use	B.	drop gradually towards the point of use
C.	be laid vertically	D.	be laid exactly horizontally

56.

To avoid moisture troubles, the branch connections from compressed air lines should be taken from

A.	top side of main	B.	bottom side of main
C.	left side of main	D.	right side of main

57.

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

58.

Volumetric efficiency of a compressor with clearance volume

A.	increases with increase in compression ratio	B.	decreases with increase in compression ratio
C.	in not dependent upon compression ratio	D.	may increase/decrease depending on compressor capacity

59.

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

60.

Volumetric efficiency of air compressors is of the order of

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

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