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Refrigeration and Air Conditioning

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

CO2
Freon-22
Air
Freon-11

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Refrigeration and Air Conditioning
A refrigerant compressor is used to

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

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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
In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

None of these
Evaporator
Absorber
Condenser

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Increases
Decreases
Remains constant
None of these

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Refrigeration and Air Conditioning
In vapour compression cycle the condition of refrigerant is superheated vapour

After passing through the expansion or throttle valve
After passing through the condenser
Before passing through the condenser
Before entering the expansion valve

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MORE MCQ ON Refrigeration and Air Conditioning

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