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Refrigeration and Air Conditioning

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

Equal to
More than
Less than
None of these

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

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Refrigeration and Air Conditioning
The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to

Red
Bright green
Yellow
Orange

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

Wet bulb temperature
Dry bulb temperature
None of these
Dew point temperature

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

Carbon dioxide
Ammonia
Sulphur dioxide
R-12

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-10.5°C
-30°C
-33.3°C
-77.7°C

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