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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