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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

1/ B.P.F.
1 - B. P.F.
1 + B.P.F.
P.F. - 1

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Refrigeration and Air Conditioning
Which of the following cycles uses air as the refrigerant?

Bell Coleman
Ericson
Stirling
Carnot

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Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Evaporation of the refrigerant liquid
Compression of the refrigerant vapour
Condensation of the refrigerant vapour
Metering of the refrigerant liquid

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Water and lithium bromide
Water and water
Ammonia and lithium bromide
Ammonia and water

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

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

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Refrigeration and Air Conditioning
One ton refrigeration corresponds to

80 kcal/ hr
50 kcal/ min
50 kcal/ hr
80 kcal/ min

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MORE MCQ ON Refrigeration and Air Conditioning

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