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61.

In a four stage compressor system first and third stage pressures are 1 and 9 kg/cm2 respectively. What will be the fourth stage delivery pressure

62.

According to Charle's law

A.	At constant pressure the volume of a gas is proportional to its absolute temperature	B.	At constant temperature, pressure is proportional to temperature
C.	At constant temperature, pressure of a gas is proportional to its volume	D.	At constant volume the absolute pressure is proportional to the temperature
E.	None of the above

63.

To avoid moisture trubles, the branch connection from compressed air line are taken from

64.

A heat exchanger that can remove fixed quantity of heat from a system is available where should it be installed for best economy

A.	Prior to first stage compression	B.	As intercooler
C.	After final stage compression	D.	Depends upon size of installation
E.	Anywhere

65.

The fact that the product of pressure and volume of a fixed amount of gas is approximately a constant value is known as

66.

For minimum work in multistage compression, the work done on

A.	First stage should be least	B.	Last stage should be least
C.	All stage should be equal	D.	There is no such consideration
E.	None of the above

67.

In multistage compression, perfect intercooling means

A.	Temperature of air at inlet to subsequent stages is equal to initial temperature	B.	Temperature of air at inlet to subsequent stages is less than initial temperature
C.	Temperature of air at inlet to subsequent stages should be zero	D.	Temperature of inlet to subsequent stages should be equal to the final temperature
E.	None of the above

68.

The performance of air compressor at high altitudes as compared to that at sea level will be

A.	Better	B.	Same
C.	Inferior	D.	Will depend upon temperature of air
E.	Will depend on type of compressor

69.

According to Boyle's law

A.	At constant pressure the temperature of a gas varies inversely as its volume	B.	At constant pressure the absolute temperature of a gas varies inversely as its volume
C.	At constant temperature, the pressure of a gas varies inversely as its volume	D.	At constant temperature, the absolute pressure of a gas varies inversely as its volume
E.	None of the above

70.

Which is incorrect?

A.	Compression ratio = initial volume + final volume	B.	Final pressure = Initial pressure x compression ratio
C.	Initial pressure = final pressure + compression ratio	D.	Initial volume = compression ratio x final volume
E.	None of the above