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Refrigeration and Air Conditioning

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

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

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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)

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

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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)

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

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Refrigeration and Air Conditioning
The material of pipe lines for a system using Freon as a refrigerant should be

Steel
Aluminium
Brass
Copper

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Aluminium
Iron
Lead
Rubber

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Refrigeration and Air Conditioning
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is

Equal
Smaller/bigger depending on capacity
Smaller
Bigger

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MORE MCQ ON Refrigeration and Air Conditioning

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