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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

20°C DBT and 50% RH
20°C DBT and 60% RH
26°C DBT and 60% RH
26°C DBT and 50% RH

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Refrigeration and Air Conditioning
Air refrigerator works on

None of these
Reversed Carnot cycle
Bell Coleman cycle
Both (A) and (B)

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Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

None of these
Increased to a value above its critical temperature
Equal to critical temperature
Reduced to a value below its critical temperature

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Refrigeration and Air Conditioning
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

O.P.)R + 1
O.P.)P = (
(
O.P.)P = (
O.P)R - 1
O.P)P = (
(
O.P)R
(
(
O.P.)R + 2
O.P)P = (

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Refrigeration and Air Conditioning
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

43833
3
43834
4

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Refrigeration and Air Conditioning
The relative coefficient of performance is

Actual COP/theoretical COP
Theoretical COP/actual COP
None of these
Actual COP × theoretical COP

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