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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For unsaturated air, the dew point temperature is __________ wet bulb temperature.

Less than
More than
None of these
Equal to

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

noisy operation
cooling below 0°C
quiet operation
very little power consumption

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Refrigeration and Air Conditioning
Carbon dioxide is

All of the listed here
Colourless
Non-flammable
Odourless

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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)

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

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Refrigeration and Air Conditioning
Most of the domestic refrigerators work on the following refrigeration system

Vapour absorption
Carnot cycle
Vapour compression
Electrolux refrigerator

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Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

20 to 50°C
None of these
70 to 110°C
50 to 70°C

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