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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The specific humidity during heating and humidification process.

Decreases
None of these
Increases
Remains constant

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Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

7.44 kW
1.86 kW
3.72 kW
18.6 kW

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

None of these
Defrosting evaporator
Frosting evaporator
Non-frosting evaporator

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It reacts with copper and its alloys.
All of these
It requires large displacement per TR compared to fluoro carbons.
It is toxic to mucous membranes.

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Refrigeration and Air Conditioning
During adiabatic saturation process on unsaturated air ___ remains constant.

Relative humidity
Wet bulb temperature
Dry bulb temperature
Dew point temperature

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Refrigeration and Air Conditioning
The curved lines on a psychrometric chart indicates

Dry bulb temperature
Wet bulb temperature
Dew point temperature
Relative humidity

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