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
1/4
1/3
3
4
Answer: Option
Explanation:
No answer description is available. Let's discuss.

2.
A refrigerant with the highest critical pressure is
R-11
R-12
R-22
Ammonia
Answer: Option
Explanation:
No answer description is available. Let's discuss.

3.
In a shell and tube heat exchanger, baffles are provided on the shell side to
improve heat transfer
provide support for tubes
prevent stagnation of shell side fluid
all of these
Answer: Option
Explanation:
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4.
The average value of thermal conductivity for water at 20° C saturate is about 0.51.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.

5.
In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
condenser
evaporator
absorber
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.