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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

26°C DBT and 50% RH
20°C DBT and 50% RH
26°C DBT and 60% RH
20°C DBT and 60% RH

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Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

Sulphur dioxide
R-12
Ammonia
Carbon dioxide

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Ice at 4°C
Solid and dry ice
Water at 0°C
Mixture of ice and water under equilibrium conditions

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Refrigeration and Air Conditioning
Highest temperature encountered in refrigeration cycle should be

Above critical temperature
Near critical temperature of refrigerant
Much below critical temperature
At critical Temperature

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Refrigeration and Air Conditioning
The power per tonne of refrigeration is

3.5/C.O.P.
O.P/3.5
None of these
3.5 × C.O.P.

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Refrigeration and Air Conditioning
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

Unpredictable
More
Less
Equally

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