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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.25
0.8
0.5
1.25

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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
Allowable pressure on high pressure side or ammonia absorption system is of the order of

24 bars
56 bars
Slightly above atmospheric pressure
Atmospheric pressure

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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
In a refrigerating machine, heat rejected is _________ heat absorbed.

None of these
Greater than
Equal to
Less than

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Refrigeration and Air Conditioning
Vertical lines on pressure-enthalpy chart show constant

Total heat lines
Entropy lines
Pressure lines
Temperature lines

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