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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The dry bulb temperature during sensible heating of air

Increases
None of these
Decreases
Remains constant

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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

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

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

Bell Coleman
Stirling
Ericson
Carnot

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Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-22
R-12
R-11
Ammonia

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Refrigeration and Air Conditioning
The thermostatic expansion valve operates on the changes in the

Degree of superheat at exit from the evaporator
None of these
Pressure in the evaporator
Temperature of the evaporator

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Refrigeration and Air Conditioning
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is

Smaller
Equal
Bigger
Smaller/bigger depending on capacity

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