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BPSC AE (ME) Quiz - 11

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Question 1

In axial flow compressor air enters and leaves the stage axially. Find the degree of reaction, if the whirl component of air leaving the rotor is one third of the mean peripheral velocity of rotor blades.

Question 2

A 3-stage reciprocating compressor has suction pressure of 1 bar delivery pressure of 27 bar. For minimum work of compression, the delivery pressure of 1st stage is

Question 3

Which one of the following statements is correct regarding Reheat factor ?

Question 4

For a 2-stage air compressor for the maximum efficiency of compressor, consider the following statements:
1)

3) Intercooling between the stages is complete
4) Work is equally shared by the two stages
Which of these statements are correct?

Question 5

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

Question 6

In a radial blade centrigugal compressor, the velocity of blade tip at outlet is 400 m/s and slip factor is 0.9. Assuming the absolute velocity at inlet to be axial, the work done per kg of flow is

Question 7

The flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as____.

Question 8

Which one of the following types of compressors is mostly used for supercharging of I.C. engines?

Question 9

The ratio of clearance volume to the displacement volume of an R12 reciprocating compressor is 0.06. Specific volume at inlet and outlet compressor are 0.03 and 0.01 m³/kg, respectively. Volumetric efficiency of the compressor is ___________.

Question 10

Air is compressed isentropically in a compressor from 1 bar to 5 bar. Assuming γ = 1.4 for air and clearance volume is 5% of swept volume, the volumetric efficiency of the compressor is (Take (5)^0.714 = 3.157):

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AE & JE Exams Mechanical Engineering

Feb 24AE & JE Exams