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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

Increase
Reduce
Equalize
None of these

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Refrigeration and Air Conditioning
The domestic refrigerator uses following type of compressor

Miniature sealed unit
Centrifugal
Piston type reciprocating
Axial

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

Defrosting evaporator
None of these
Non-frosting evaporator
Frosting evaporator

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Refrigeration and Air Conditioning
The human body feels comfortable when the heat stored in the body is

Negative
Positive
Zero
None of these

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Refrigeration and Air Conditioning
The difference between dry bulb temperature and wet bulb temperature, is called

Wet bulb depression
Dew point depression
Dry bulb depression
Degree of saturation

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

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

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