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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The higher temperature in vapour compression cycle occurs at

Expansion valve
Compressor discharge
Evaporator
Receiver

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Cooled and dehumidified
Cooled and humidified
Heated and dehumidified
Heated and humidified

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Refrigeration and Air Conditioning
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

Relative humidity
Degree of saturation
Humidity ratio
Absolute humidity

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

All of these
Lowers compressor capacity because vapour is lighter
Increases power required per ton of refrigeration
Lowers evaporation temperature

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Refrigeration and Air Conditioning
Which of the following is not a desirable property of a refrigerant?

Low boiling point
High risibility with oil
Good electrical conductor
Large latent heat

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

R-12
Carbon dioxide
Sulphur dioxide
Ammonia

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MORE MCQ ON Refrigeration and Air Conditioning

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