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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

0.2
6
5
1.2

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Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

Increased to a value above its critical temperature
Equal to critical temperature
Reduced to a value below its critical temperature
None of these

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Refrigeration and Air Conditioning
During sensible cooling,

Specific humidity increases
Wet bulb temperature increases
Relative humidity remains constant
Partial pressure of vapour remains constant

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Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Equal to
None of these
Less than
Greater than

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Refrigeration and Air Conditioning
Carbon dioxide is

All of the listed here
Non-flammable
Odourless
Colourless

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Refrigeration and Air Conditioning
In a refrigerating machine, heat rejected is _________ heat absorbed.

Equal to
None of these
Greater than
Less than

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