Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

1. 

A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

A. 1/4
B. 1/3
C. 3
D. 4

Answer: Option D

Explanation:

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2. 

A refrigerant with the highest critical pressure is

A. R-11
B. R-12
C. R-22
D. Ammonia

Answer: Option D

Explanation:

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3. 

In a shell and tube heat exchanger, baffles are provided on the shell side to

A. improve heat transfer
B. provide support for tubes
C. prevent stagnation of shell side fluid
D. all of these

Answer: Option D

Explanation:

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4. 

The average value of thermal conductivity for water at 20° C saturate is about 0.51.

A. True
B. False

Answer: Option A

Explanation:

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5. 

In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

A. condenser
B. evaporator
C. absorber
D. none of these

Answer: Option A

Explanation:

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