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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

0.2
5
6
1.2

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Refrigeration and Air Conditioning
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

Any value
Zero
As low as possible (3 to 11°C)
High, of the order of 25°

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Refrigeration and Air Conditioning
The sub-cooling in a refrigeration cycle

Decreases C.O.P.
None of these
Does not alter C.O.P.
Increases C.O.P.

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Iron
Rubber
Aluminium
Lead

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Refrigeration and Air Conditioning
As relative humidity decreases, the dew point temperature will be ___ wet bulb temperature.

Same as
None of the listed here
Higher than
Lower than

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Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Wet bulb temperature
Specific humidity
Dry bulb temperature
Dew point temperature

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