148) The multi-stage compression of air as compared to single stage compression

improves volumetric efficiency for the given pressure ratio

reduces workdone per kg of air

gives more uniform torque

all of these

Answer is:

all of these

Explanation:

The multi-stage compression of air as compared to single-stage compression
* Improves volumetric efficiency
* Reduces the work done per kg of air
* Gives more uniform torque

Compressors Gas dynamics and Gas Turbines MCQ with Answers

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Related Compressors Gas dynamics and Gas Turbines MCQ with Answers

149) Which one of the following is the effect of blade shape on performance of a centrifugal compressor ?

Backward curved blades has poor efficiency

Backward curved blades lead to stable performance

Forward curved blades has higher efficiency

Forward curved blades produce lower pressure ratio

Answer is:

Forward curved blades produce lower pressure ratio

150) In a jet engine, the air-fuel ratio is

30:1

40:1

50:1

60:1

Answer is:

60:1

151) Which of the following bladings will give maximum pressure rise in a centrifugal compressor, assuming the same overall dimensions, blade inlet angle and rotational speeds ?

Forward curved blades

Backward curved blades

Radial blades

all of these

Answer is:

Forward curved blades

152) In an axial flow compressor, the ratio of pressure in theTOtor blades to the pressure rise in the compressor in one stage is known as

work factor

slip factor

degree of reaction

pressure coefficient

Answer is:

degree of reaction

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