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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

0.2
1.2
5
6

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Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Using reagents
Sulphur sticks which on detection gives white smoke
Halide torch which on detection produces greenish flame lighting
Smelling

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

noisy operation
cooling below 0°C
quiet operation
very little power consumption

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-77.7°C
-75.2°C
-135.8°C
-56.6°C

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

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

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Refrigeration and Air Conditioning
In a refrigeration cycle, the flow of refrigerant is controlled by

Evaporator
Compressor
Condenser
Expansion valve

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MORE MCQ ON Refrigeration and Air Conditioning

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