Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines

Exercise :: Compressors, Gas Dynamics and Gas Turbines - Section 3

41. 

The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

A. rγ - 1
B. 1 - rγ - 1
C.
D.

Answer: Option C

Explanation:

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42. 

The speed of rotary air compressor is __________ as compared to reciprocating air compressor.

A. high
B. low

Answer: Option A

Explanation:

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43. 

When air is to be compressed at a high pressure, then it is advantageous to use

A. single stage compression
B. multi-stage compression without intercooling
C. multi-stage compression with intercooling
D. none of these

Answer: Option C

Explanation:

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44. 

The absolute pressure of air at the outlet of a compressor is called

A. back pressure
B. critical pressure
C. discharge pressure
D. none of these

Answer: Option C

Explanation:

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45. 

The degree of reaction is usually kept __________ for all types of axial flow compressors.

A. 0.2
B. 0.3
C. 0.4
D. 0.5

Answer: Option D

Explanation:

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