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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The curved lines on a psychrometric chart indicates

Relative humidity
Wet bulb temperature
Dry bulb temperature
Dew point temperature

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Refrigeration and Air Conditioning
The dry bulb temperature during sensible heating of air

Decreases
Increases
Remains constant
None of these

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Sulphur dioxide
Ammonia
R-12
Carbon dioxide

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Refrigeration and Air Conditioning
In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

Generator
Absorber and generator
Liquid pump
Absorber, generator and liquid pump

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Refrigeration and Air Conditioning
During heating and dehumidification process, dry bulb temperature

Decreases
Remains constant
Increases
None of these

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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

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

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MORE MCQ ON Refrigeration and Air Conditioning

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