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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The humidity ratio or specific humidity is the mass of water vapour present in

1 m3 of wet air
1 kg of dry air
1 m3 of dry air
1 kg of wet air

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

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Refrigeration and Air Conditioning
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

Carbon dioxide
Lithium bromide
R-12
Sulphur dioxide

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Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

High side float valve
Thermostatic expansion valve
Low side float valve
Automatic expansion valve

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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

0.3
0.67
1.5
0.6

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = hl/k
NN = ρ V l /μ
NN = μ cp/k
NN = V²/t.cp

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MORE MCQ ON Refrigeration and Air Conditioning

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