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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 - C.O.P.
1 + (1/C.O.P)
1 - (1/C.O.P)
1 + C.O.P

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

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

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 9
9: 1
1: 3
1: 1

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Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.25
0.5
0.8
1.25

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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 never evaporate
Water will evaporate

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

2 bar
15 bar
8 bar
30 bar

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