Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Critical pressure of refrigerant
Near critical pressure
Much below critical pressure
Much above critical pressure

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Refrigeration and Air Conditioning
One ton of the refrigeration is

The standard unit used in refrigeration problems
The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
The refrigeration effect to produce 1 ton of ice at NTP conditions
The cooling effect produced by melting 1 ton of ice

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