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Refrigeration and Air Conditioning

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

Same as
Lower than
Higher than
None of the listed here

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Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

R-12
Ammonia
Sulphur dioxide
Carbon dioxide

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Refrigeration and Air Conditioning
During cooling and dehumidification, dry bulb temperature

Increases
Decreases
None of these
Remains constant

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Near critical pressure
Critical pressure of refrigerant
Much above critical pressure
Much below critical pressure

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

Frosting evaporator
Non-frosting evaporator
Defrosting evaporator
None of these

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

30 bar
2 bar
15 bar
8 bar

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