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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Commercial refrigerators
Domestic refrigerators
Air conditioning
Gas liquefaction

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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

6
0.2
5
1.2

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

Remains constant
Increases
Decreases
None of these

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Refrigeration and Air Conditioning
The material of pipe lines for a system using Freon as a refrigerant should be

Steel
Brass
Aluminium
Copper

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Refrigeration and Air Conditioning
Wet bulb temperature is the temperature of air recorded by a thermometer, when

None of these
The moisture present in it begins to condense
It is not affected by the moisture present in the air
Its bulb is surrounded by a wet cloth exposed to the air

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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
1/e₁ + 1/e₂
e₁e₂
e₁ + e₂

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MORE MCQ ON Refrigeration and Air Conditioning

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