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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Chaperon equation is applicable for registration at

Sublimation temperature
Saturation point of liquid
Triple point
Saturation point of vapour

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

R-22
Ammonia
R-11
R-12

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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: 1
9: 1
1: 9
1: 3

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Refrigeration and Air Conditioning
In a vapour compression cycle, the refrigerant immediately after expansion valve is

Saturated liquid
Liquid
Sub-cooled liquid
Wet vapour

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

None of these
Higher than
Same as
Lower than

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

Sulphur dioxide
Carbon dioxide
R-12
Ammonia

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