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Refrigeration and Air Conditioning

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

Centrifugal
Axial
Miniature sealed unit
Piston type reciprocating

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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 Joule cycle
Reversed Brayton cycle
Reversed Carnot cycle

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Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

increases
decreases
remains same
depends on other factors

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Rubber
Iron
Lead
Aluminium

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Refrigeration and Air Conditioning
In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is

More than or equal to 3.65 kg
There is no such consideration
Less than 2 kg
More than 10 kg

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Refrigeration and Air Conditioning
In case of sensible cooling of air, the coil efficiency is given by

1 + B.P.F.
1 - B.P.F.
P.F. - 1
1/ B.P.F.

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MORE MCQ ON Refrigeration and Air Conditioning

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