The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

1.86 kW

3.72 kW

18.6 kW

7.44 kW

1.86 kW

3.72 kW

18.6 kW

7.44 kW

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Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Decreases

Remains constant

Increases

None of these

Decreases

Remains constant

Increases

None of these

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Refrigeration and Air Conditioning
The coefficient of performance of Electrolux refrigerator is the ratio of

Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner

Heat absorbed by the evaporator to the heat supplied by the gas burner

Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

Heat supplied by the gas burner to the heat absorbed by the evaporator

Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner

Heat absorbed by the evaporator to the heat supplied by the gas burner

Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

Heat supplied by the gas burner to the heat absorbed by the evaporator

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

125 kJ/kg

100 kJ/kg

25 kJ/kg

50 kJ/kg

125 kJ/kg

100 kJ/kg

25 kJ/kg

50 kJ/kg

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

noisy operation

quiet operation

very little power consumption

cooling below 0°C

noisy operation

quiet operation

very little power consumption

cooling below 0°C

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Refrigeration and Air Conditioning
The COP of a domestic refrigerator

Is equal to 1

Is less than 1

Depends upon the make

Is more than 1

Is equal to 1

Is less than 1

Depends upon the make

Is more than 1

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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning The specific humidity during cooling and dehumidification

Refrigeration and Air Conditioning The coefficient of performance of Electrolux refrigerator is the ratio of

Refrigeration and Air Conditioning An important characteristic of absorption system of refrigeration is

Refrigeration and Air Conditioning The COP of a domestic refrigerator

Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Refrigeration and Air Conditioning
The coefficient of performance of Electrolux refrigerator is the ratio of

Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

Refrigeration and Air Conditioning
The COP of a domestic refrigerator