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51.

A 50 cfm compressor can

A.	Compress 50 cu feet per min of free air	B.	Compress 50 cu feet per min of standard air
C.	Deliver 50 cu feet of compressed air at delivery pressure	D.	Delivers 50 cu ft. per minute of compressed air
E.	None of the above

52.

As the compression ratio increases the volumetric efficiency of air compressor

53.

Centrifugal blowers can supply

A.	Large volumes of air at low pressures	B.	Large volumes of air at high pressures
C.	Small volumes of air at high pressures	D.	Small volumes of air at low pressures
E.	None of the above

54.

For gas turbines compressors used are

55.

Intake air filters are provided on air compressor for

A.	Removing dirt and dust from suction air	B.	Reducing temperature of suction air
C.	Reducing pressure of suction pressure	D.	Removing impurities of air
E.	None of the above

56.

Separators are generally used in air compressor installations

A.	Between after cooler and receiver	B.	Before first stage suction
C.	Before intercooler	D.	After intercooler
E.	None of the above

57.

The function of a receiver in compressor installations is

A.	To collect compressed air	B.	To dempen pulsations or pressure waves incompressor discharge
C.	To reduce temperature of compressed air	D.	To reduce moisture content of compressed air
E.	None of the above

58.

Which one of the following is a safety device on a compressor?

59.

If an air cooled compressor gets over-heated during operation, the probable cause cannot be

A.	Intake fliter clogged	B.	Insufficient lubricating oil
C.	Valve strips broken	D.	Leadage in intercooler
E.	Direction of rotation wrong

60.

If a water cooled compressor knocks during operation, the probable cause cannot be

A.	Loose flywheel or pulley	B.	Too much clearance in crank pin
C.	Loose valve	D.	Excess cooling in intercooler
E.	Air filter choked