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Refrigeration and Air Conditioning

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

Same as
Higher than
None of these
Lower than

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It is toxic to mucous membranes.
It requires large displacement per TR compared to fluoro carbons.
It reacts with copper and its alloys.
All of these

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Refrigeration and Air Conditioning
A vapour absorption refrigeration system

Cools below 0°C
Gives noisy operation
Requires little power consumption
Gives quiet operation

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

Ammonia
Sulphur dioxide
R-12
Carbon dioxide

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Refrigeration and Air Conditioning
The process, generally used in summer air conditioning to cool and dehumidify the air, is called

Cooling and dehumidification
Dehumidification
Heating and humidification
Humidification

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Refrigeration and Air Conditioning
In vapour compression refrigeration system, refrigerant occurs as liquid between

Expansion valve and evaporator
Compressor and condenser
Condenser and expansion valve
Compressor and evaporator

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