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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/hK
m/hK
m²/h
m/h

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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

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

May be higher or lower depending upon the nature of non-condensable gases
Will remain unaffected
Will be higher
Will be lower

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Refrigeration and Air Conditioning
Freon group of refrigerants are

Toxic
Non-inflammable and toxic
Inflammable
Nontoxic and non-inflammable

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Refrigeration and Air Conditioning
A refrigerant compressor is used to

Raise the temperature of the refrigerant
Raise the pressure of the refrigerant
Circulate the refrigerant through the refrigerating system
All of these

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Refrigeration and Air Conditioning
The desirable property of a refrigerant is

All of these
Low boiling point
High critical temperature
High latent heat of vaporisation

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