For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

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

A

Work factor

B

Slip factor

C

Degree of reaction

D

Pressure coefficient

The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

A

P, Q and R

B

P and R

C

R and S

D

P, R and S

The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

A

Increase first at fast rate and then slow

B

Increase first at slow rate and then fast

C

Decrease continuously

D

First increase, reach maximum and then decrease

Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

A

Less power requirement

B

Better mechanical balance

C

Less loss of air due to leakage past the cylinder

D

Lower volumetric efficiency

For very low pressure and high discharge rate, the compressor used is a/an __________ compressor.

A

Axial

B

Reciprocating

C

Rotary

D

None of these

Rahim's convertible gets gas mileage that is 40% higher than that of Karim's SUV. If Jalil's hatchback gets gas mileage that is 15% higher than of Rahim's convertible, then that of Rahim's convertible, then Jalil's hatchback gets gas mileage that is what percent greater that of Karim's SUV?

A

46%

B

55%

C

61%

D

25%

The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

A

Less

B

More

C

Same

D

More/less depending on compressor capacity

The product P of two prime numbers is between 9 and 55. If one of the prime numbers is greater than 2 but less than 6 and the other is greater than 13 but less than 25, then P =

A

15

B

33

C

34

D

51

If the flow of air through the compressor is parallel to its axis, then the compressor is

A

Reciprocating compressor

B

Centrifugal compressor

C

Axial flow compressor

D

Turbo compressor

The compressor performance at higher altitude compared to sea level will be

A

Same

B

Higher

C

Lower

D

Dependent on other factors

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

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