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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

Carbon dioxide
Ammonia
Sulphur dioxide
R-12

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Refrigeration and Air Conditioning
In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

0.6
1.5
0.3
0.67

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Refrigeration and Air Conditioning
For obtaining high COP, the pressure range of compressor should be

Optimum
Any value
Low
High

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Refrigeration and Air Conditioning
The humidity ratio or specific humidity is the mass of water vapour present in

1 kg of dry air
1 m3 of dry air
1 m3 of wet air
1 kg of wet air

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Refrigeration and Air Conditioning
The COP of a domestic refrigerator

Is less than 1
Is equal to 1
Depends upon the make
Is more than 1

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = hl/k
NN = μ cp/k
NN = V²/t.cp
NN = ρ V l /μ

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