Compressors, Gas Dynamics and Gas Turbines - Section 1 (5)

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Compressors, Gas Dynamics and Gas Turbines - Section 1

33.

The ratio of workdone per cycle to the stroke volume of the compressor is known as

A.	compressor capacity
B.	compression ratio
C.	compressor efficiency
D.	mean effective pressure

Answer: Option D

Explanation:

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34.

For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is p_a, then the intermediate pressure p₂ is given by

A.	p2 = (p1 + p3)/2
B.	p2 = p1.p3
C.	P2 = Pa x p3/p1
D.	p2 = pa p3/p1

Answer: Option B

Explanation:

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35.

Intercooling in multi-stage compressors is done

A.	to cool the air during compression
B.	to cool the air at delivery
C.	to enable compression in two stages
D.	to minimise the work of compression

Answer: Option D

Explanation:

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36.

The capacity of a compressor is expressed in

A.	kg/m2
B.	kg/m3
C.	m3/min
D.	m3/kg

Answer: Option C

Explanation:

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37.

The maximum delivery pressure in a rotary air compressor is

A.	10 bar
B.	20 bar
C.	30 bar
D.	50 bar

Answer: Option A

Explanation:

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38.

The increase in pressure in a vane blower takes place first due to compression and then due to back flow of air.

A.	Correct
B.	Incorrect

Answer: Option A

Explanation:

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39.

In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston.

A.	one stroke
B.	two strokes
C.	three strokes
D.	four strokes

Answer: Option B

Explanation:

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40.

Which of the following statement is wrong?

A.	In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
B.	The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.
C.	The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
D.	none of the above

Answer: Option D

Explanation:

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