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Refrigeration and Air Conditioning

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

Copper
Brass
Steel
Aluminium

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It gives higher coefficient of performance
It is miscible with oil over large range of temperatures
It has low operating pressures
All of these

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid becomes solid
Above which liquid will remain liquid
Above which liquid becomes gas
Above which liquid becomes vapour

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

A gas will never liquefy
A gas will immediately liquefy
Water will evaporate
Water will never evaporate

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Refrigeration and Air Conditioning
The COP of a domestic refrigerator

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

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will remain unaffected
Will be lower
May be higher or lower depending upon the nature of non-condensable gases
Will be higher

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MORE MCQ ON Refrigeration and Air Conditioning

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