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Refrigeration and Air Conditioning

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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Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

Very low
High
Same
Low

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Refrigeration and Air Conditioning
One tonne of refrigeration (1TR) means that the heat removing capacity is

420 kJ/min
620 kJ/min
21 kJ/min
210 kJ/min

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Refrigeration and Air Conditioning
In vapour compression cycle the condition of refrigerant is superheated vapour

After passing through the expansion or throttle valve
After passing through the condenser
Before entering the expansion valve
Before passing through the condenser

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Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

(Actual C.O.P.) × (Theoretical C.O.P.)
(Theoretical C.O.P.)/ (Actual C.O.P.)
None of these
(Actual C.O.P.) /(Theoretical C.O.P.)

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Sulphur dioxide
Ammonia
Carbon dioxide
R-12

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MORE MCQ ON Refrigeration and Air Conditioning

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