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

7.44 kW

1.86 kW

18.6 kW

3.72 kW

7.44 kW

1.86 kW

18.6 kW

3.72 kW

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Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

Maintains different temperatures in evaporator in proportion to load

Is suitable only for constant load systems

Ensures the evaporator completely filled with refrigerant of the load

None of these

Maintains different temperatures in evaporator in proportion to load

Is suitable only for constant load systems

Ensures the evaporator completely filled with refrigerant of the load

None of these

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Is immaterial

Can be avoided by proper design

Results in loss of heat due to poor heat transfer

Increases heat transfer rate

Is immaterial

Can be avoided by proper design

Results in loss of heat due to poor heat transfer

Increases heat transfer rate

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Refrigeration and Air Conditioning
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with oxygen and cause its depletion

These react with water vapour and cause acid rain

These react with ozone layer

These react with plants and cause greenhouse effect

These react with oxygen and cause its depletion

These react with water vapour and cause acid rain

These react with ozone layer

These react with plants and cause greenhouse effect

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Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

High boiling point

Non-explosive

Non-flammable

Non-toxic

High boiling point

Non-explosive

Non-flammable

Non-toxic

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Refrigeration and Air Conditioning
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

May increase or decrease depending on the type of refrigerant used

Remain unaffected

Increase

Decrease

May increase or decrease depending on the type of refrigerant used

Remain unaffected

Increase

Decrease

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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning A thermostatic expansion valve in a refrigeration system

Refrigeration and Air Conditioning Formation of frost on evaporator in refrigerator

Refrigeration and Air Conditioning Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

Refrigeration and Air Conditioning The undesirable property of a refrigerant is

Refrigeration and Air Conditioning The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Refrigeration and Air Conditioning
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

Refrigeration and Air Conditioning
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will