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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

NH3
Freon-22
Freon-12
CO2

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Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1/e₁ + 1/e₂
e₁ + e₂
(e₁ + e₂)/ e₁ + e₂ - e₁e₂
e₁e₂

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Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

Air
CO2
Freon-22
Freon-11

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Refrigeration and Air Conditioning
Rating of a domestic refrigerator is of the order of

40 tons
10 tons
0.1 ton
5 tons

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Refrigeration and Air Conditioning
The cooling system used for supersonic aircrafts and rockets is

Reduced ambient air cooling system
Bootstrap air cooling system
Simple air cooling system
Regenerative air cooling system

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Refrigeration and Air Conditioning
The higher temperature in vapour compression cycle occurs at

Receiver
Compressor discharge
Expansion valve
Evaporator

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