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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Specific humidity
Wet bulb temperature
Dew point temperature
Dry bulb temperature

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Refrigeration and Air Conditioning
The bank of tubes at the back of domestic refrigerator is

Condenser tubes
Capillary tubes
Evaporator tubes
Refrigerant cooling tubes

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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
100 kJ/kg
125 kJ/kg

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Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/hK
m²/h
m/h
m/hK

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Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

High
Same
Very low
Low

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Refrigeration and Air Conditioning
During humidification process, __________ increases.

Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity

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