Refrigeration and Air Conditioning
Wet bulb temperature is the temperature of air recorded by a thermometer, when

Its bulb is surrounded by a wet cloth exposed to the air
None of these
The moisture present in it begins to condense
It is not affected by the moisture present in the air

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Refrigeration and Air Conditioning
In a lithium bromide absorption refrigeration system

Lithium bromide is used as a refrigerant and water as an absorbent
None of these
Water is used as a refrigerant and lithium bromide as an absorbent
Ammonia is used as a refrigerant and lithium bromide as an absorbent

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Refrigeration and Air Conditioning
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

It improves the C.O.P., as the condenser is small
The positive work in isentropic expansion of liquid is very small
It considerably reduces mass of the system
It leads to significant cost reduction

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