Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines

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

21. 

Which of the following statement is correct?

A. The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
B. The compression ratio for the compressor is always greater than unity.
C. The compressor capacity is the ratio of workdone per cycle to the stroke volume.
D. During isothermal compression of air, the workdone in a compressor is maximum.

Answer: Option B

Explanation:

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22. 

In the aircraft propellers

A. the propulsive matter is ejected from within the propelled body
B. the propulsive matter is caused to flow around the propelled body
C. its functioning does not depend upon the presence of air
D. none of the above

Answer: Option A

Explanation:

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23. 

The type of rotary compressor used in gas turbines, is of

A. centrifugal type
B. axial flow type
C. radial flow type
D. none of these

Answer: Option B

Explanation:

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24. 

The volume of air delivered by the compressor is called

A. free air delivery
B. compressor capacity
C. swept volume
D. none of these

Answer: Option B

Explanation:

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25. 

The efficiency of a jet engine is higher at

A. low speeds
B. high speeds
C. low altitudes
D. high altitudes

Answer: Option D

Explanation:

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