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Refrigeration and Air Conditioning

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

All of these
Halide torch
Soap and water
Sulphur sticks

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Refrigeration and Air Conditioning
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the

Heat dissipated to the surroundings
Difference of (A) and (B)
Heat stored in the human body
Sum of (A) and (B)

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

All of these
It gives higher coefficient of performance
It has low operating pressures
It is miscible with oil over large range of temperatures

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Refrigeration and Air Conditioning
In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

0.6
0.67
0.3
1.5

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

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

May be higher or lower depending upon the nature of non-condensable gases
Will be higher
Will be lower
Will remain unaffected

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