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491.

Which of the following functions reduces the irreversibility of a cycle?

A.	use of lower pressure	B.	regeneration
C.	high speed operation	D.	low exhaust pressures

492.

Which turbine has identical fixed and moving blades

A.	Parson's reaction turbine	B.	Hero's turbine
C.	Rateau's turbine	D.	De Laval turbine

493.

Which of the following is not a petroleum product?

A.	Methylated spirit	B.	Petrol
C.	Kerosene	D.	Lubricating oil

494.

Which of the following fuel can be obtained by fermentation of vegetable matter?

A.	Benzene	B.	Diesel
C.	Gasoline	D.	Alcohol

495.

The molecular weight of a mixture containing 20% oxygen, 20 percent nitrogen and 60 percent carbon dioxise on volume bases will be nearly

A.	41.4	B.	38.4
C.	33.3	D.	29.9

496.

For reciprocating air compressor the law of compression desired is isothermal and that may be possible by

A.	Very high speeds	B.	very low speeds
C.	any speed as speed does not affect the compression law	D.	None of the above

497.

In reciprocating air compressor, the method of controlling the quantity of air delivered is done by

A.	Clearance Control	B.	Throttle Control
C.	Blow-off Control	D.	All of the above