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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb depression indicates _________ humidity of the air.

Specific
Absolute
Relative
None of these

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

100 kJ/kg
25 kJ/kg
125 kJ/kg
50 kJ/kg

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Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Condenser to the expansion valve
Expansion valve to the evaporator
Condenser to the evaporator
Evaporator to the thermostat

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

25°C DBT and 40% RH
25°C DBT and 100% RH
22°C DBT and 60% RH
20°C DBT and 80% RH

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Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Condenser
Compressor
Expansion valve
Evaporator

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Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Remains constant
Decreases
None of these
Increases

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