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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The leakage in a refrigeration system using ammonia is detected by

Halide torch
All of these
Sulphur sticks
Soap and water

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

Air
Freon-11
Freon-22
CO2

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Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant is dry saturated vapour

Before entering the compressor
After leaving the compressor
After leaving the condenser
Before entering the condenser

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Refrigeration and Air Conditioning
The refrigerant for a refrigerator should have

Low latent heat
High sensible heat
High latent heat
High total heat

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

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

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Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

4.33
3.33
2.33
1.33

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MORE MCQ ON Refrigeration and Air Conditioning

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