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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

Negative
None of the listed here
Positive
Zero

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Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Compression of the refrigerant vapour
Condensation of the refrigerant vapour
Evaporation of the refrigerant liquid
Metering of the refrigerant liquid

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 9
1: 1
9: 1
1: 3

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Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Condenser to the expansion valve
Condenser to the evaporator
Evaporator to the thermostat
Expansion valve to the evaporator

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

None of the listed here
Lower than
Higher than
Same as

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Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

Ammonia
R-12
Carbon dioxide
Sulphur dioxide

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