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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

5
6
1.2
0.2

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Refrigeration and Air Conditioning
Highest temperature encountered in refrigeration cycle should be

At critical Temperature
Much below critical temperature
Near critical temperature of refrigerant
Above critical temperature

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Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant is dry saturated vapour

Before entering the condenser
After leaving the compressor
Before entering the compressor
After leaving the condenser

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Refrigeration and Air Conditioning
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

Effective temperature
Dew point temperature
None of the listed here
Mean radiant temperature

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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
Greater than
None of these
Less than

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Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

(T₂ - T₁)/T₁
T₁ / (T₂ - T₁)
T₂/ (T₂ - T₁)
(T₁ - T₂)/T₁

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