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Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

Exercise : Heat Transfer, Refrigeration and Air Conditioning - Section 4
21.
In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.
same
less
greater
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
these react with water vapour and cause acid rain
these react with plants and cause green-house effect
these react with oxygen and cause its depletion
these react with ozone layer
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by
operating the machine at higher speeds
operating the machine at lower speeds
raising the higher temperature
lowering the higher temperature
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The refrigerant carbon dioxide is not widely used because of its __________ power require ments per tonne of refrigeration and high operating pressures.
low
high
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
The by-pass factor of a cooling coil decreases with
decrease in fin spacing and increase in number of rows
increase in fin spacing and increase in number of rows
increase in fin spacing and decrease in number of rows
decrease in fin spacing and decrease in number of rows
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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