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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The coefficient of performance is the ratio of the refrigerant effect to the

Heat of compression
Enthalpy increase in compressor
All of these
Work done by compressor

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Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

Equal to atmospheric pressure
Higher than atmospheric pressure
Lower than atmospheric pressure
Could be anything

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Refrigeration and Air Conditioning
The domestic refrigerator uses following type of compressor

Piston type reciprocating
Centrifugal
Miniature sealed unit
Axial

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Refrigeration and Air Conditioning
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

Cooled and dehumidified
Cooled and humidified
Heated and humidified
Heated and dehumidified

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It requires large displacement per TR compared to fluoro carbons.
It is toxic to mucous membranes.
All of these
It reacts with copper and its alloys.

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Otto cycle
Reversed Brayton cycle
Reversed Carnot cycle
Reversed Joule cycle

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MORE MCQ ON Refrigeration and Air Conditioning

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