Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines

Exercise :: Compressors, Gas Dynamics and Gas Turbines - Section 2

1. 

If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

A. D1/D2 = (p1p3)1/2
B. D1/D2 = (p1/p3)1/4
C. D1/D2 = (p1p3)1/4
D. D1/D2 = (p3/p1)1/4

Answer: Option D

Explanation:

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2. 

Reheating in a gas turbine

A. increases the thermal efficiency
B. increases the compressor work
C. increases the turbine work
D. decreases the thermal efficiency

Answer: Option A

Explanation:

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3. 

In a single stage, single acting reciprocating air compressor, without clearance, the workdone on the air during isentropic compression is __________ the heat required to raise the temperature of air from T1 to T2 at a constant pressure.

A. equal to
B. less than
C. greater than

Answer: Option A

Explanation:

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4. 

Workdone by an air compressor __________ upon the way in which the air is compressed.

A. depends
B. does not depend

Answer: Option A

Explanation:

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5. 

In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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