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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The refrigerant for a refrigerator should have

Low latent heat
High total heat
High latent heat
High sensible heat

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Refrigeration and Air Conditioning
Moisture in Freon refrigeration system causes

Corrosion of whole system
Freezing automatic regulating valve
High power consumption
Ineffective refrigeration

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Cooled and dehumidified
Heated and dehumidified
Cooled and humidified
Heated and humidified

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Refrigeration and Air Conditioning
One of the purposes of sub cooling the liquid refrigerant is to

Increase cooling effect
Reduce compressor discharge temperature
Ensure that only liquid and not the vapour enters the expansion (throttling) valve
Reduce compressor overheating

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

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

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Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

High pressure side close to receiver
Delivery of compressor
Low pressure side near receiver
Suction of compressor

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MORE MCQ ON Refrigeration and Air Conditioning

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