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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m/hK
m/h
m²/hK

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Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

increases
depends on other factors
decreases
remains same

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Refrigeration and Air Conditioning
Accumulators should have adequate volume to store refrigerant charge at least

0.5
0.25
0.1
0.75

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

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

Water will never evaporate
A gas will never liquefy
A gas will immediately liquefy
Water will evaporate

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Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Using reagents
Sulphur sticks which on detection gives white smoke
Halide torch which on detection produces greenish flame lighting
Smelling

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