Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Delivery of compressor
High pressure side close to receiver
Suction of compressor
Low pressure side near receiver

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Refrigeration and Air Conditioning
For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then

Perfectly tight vapour seal should be used
Bigger cabinet should be used
Refrigerant with lower evaporation temperature should be used
Smaller cabinet should be used

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Refrigeration and Air Conditioning
Which of the following statement is wrong?

In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour
The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region
The value of C.O.P. is always greater than one
None of the listed here

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Refrigeration and Air Conditioning
In a lithium bromide absorption refrigeration system

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

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