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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

0.3
0.6
0.67
1.5

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Refrigeration and Air Conditioning
The relative humidity lines on a psychrometric chart are

Horizontal and uniformly spaced
Vertical and uniformly spaced
Curved lines
Horizontal and non-uniformly spaced

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

quiet operation
noisy operation
very little power consumption
cooling below 0°C

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Refrigeration and Air Conditioning
The process, generally used in summer air conditioning to cool and dehumidify the air, is called

Cooling and dehumidification
Dehumidification
Heating and humidification
Humidification

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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

18.6 kW
1.86 kW
3.72 kW
7.44 kW

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

All of these
It has low operating pressures
It gives higher coefficient of performance
It is miscible with oil over large range of temperatures

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