Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines

Exercise :: Compressors, Gas Dynamics and Gas Turbines - Section 1

16. 

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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17. 

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 pa, 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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18. 

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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19. 

The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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20. 

The inlet pressure is always __________ the discharge pressure.

A. equal to
B. less than
C. more than

Answer: Option B

Explanation:

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