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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
An Electrolux refrigerator is called a ___ absorption system.

Two fluids
Three fluids
None of the listed here
Single fluid

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Refrigeration and Air Conditioning
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

Any value
As low as possible (3 to 11°C)
High, of the order of 25°
Zero

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Refrigeration and Air Conditioning
The vertical and uniformly spaced lines on a psychrometric chart indicates

Specific humidity
Dew point temperature
Dry bulb temperature
Wet bulb temperature

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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)

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

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Isentropic expansion process
Isentropic compression process
Constant pressure cooling process
Constant pressure expansion process

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

Lower than
None of the listed here
Same as
Higher than

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