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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During adiabatic saturation process on unsaturated air ___ remains constant.

Wet bulb temperature
Dry bulb temperature
Relative humidity
Dew point temperature

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Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

Freon-11
Freon-22
CO2
Air

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Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Less than
Equal to
None of these
Greater than

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

Remains constant
Increases
None of these
Decreases

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

25°C DBT and 100% RH
20°C DBT and 80% RH
25°C DBT and 40% RH
22°C DBT and 60% RH

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Refrigeration and Air Conditioning
Absorption system normally uses the following refrigerant

Ammonia
CO2
Freon-11
Freon-22

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MORE MCQ ON Refrigeration and Air Conditioning

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