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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

0.2
6
1.2
5

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Is immaterial
Results in loss of heat due to poor heat transfer
Can be avoided by proper design
Increases heat transfer rate

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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?

0.5
1.25
0.25
0.8

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using Freon is detected by

All of these
Halide torch
Sulphur sticks
Soap and water

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Refrigeration and Air Conditioning
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

Involves no change in volume
Takes place at constant entropy
Takes place at constant pressure
Takes place at constant temperature

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

5.12
1.25
1
2.15

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