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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During heating and dehumidification process, dry bulb temperature

Increases
None of these
Decreases
Remains constant

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

All of these
It gives higher coefficient of performance
It is miscible with oil over large range of temperatures
It has low operating pressures

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Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Wet bulb temperature
Dew point temperature
Dry bulb temperature
Specific humidity

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Refrigeration and Air Conditioning
Cooling water is required for following equipment in ammonia absorption plant

Absorber
Evaporator
Condenser
Condenser, absorber and separator (rectifier)

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

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

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Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

1.2
0.2
6
5

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