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Refrigeration and Air Conditioning

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.

None of these
Greater than
Equal to
Less than

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Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

decreases
remains same
depends on other factors
increases

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Refrigeration and Air Conditioning
The process, generally used in winter air-conditioning to warm and humidity the air, is called

Cooling and dehumidification
Humidification
Dehumidification
Heating and humidification

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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)

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

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

Lower than
None of these
Higher than
Same as

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Gas liquefaction
Domestic refrigerators
Air conditioning
Commercial refrigerators

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MORE MCQ ON Refrigeration and Air Conditioning

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