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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

None of the listed here
Negative
Positive
Zero

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Refrigeration and Air Conditioning
The superheating in a refrigeration cycle

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

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Refrigeration and Air Conditioning
Most air cooled condensers are designed to operate with a temperature difference of

14°C
22°C
5°C
8°C

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Ammonia
Carbon dioxide
Sulphur dioxide
R-12

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Refrigeration and Air Conditioning
The evolution of heat of solution takes place in ammonia absorption plant when

Lithium bromide mixes with ammonia
Ammonia vapour goes into solution
Weak solution mixes with strong solution
Ammonia vapour is driven out of solution

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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

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

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