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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Cooling water is required for following equipment in ammonia absorption plant

Condenser
Absorber
Evaporator
Condenser, absorber and separator (rectifier)

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Ammonia
Carbon dioxide
Brine
Freon

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Refrigeration and Air Conditioning
During sensible cooling,

Wet bulb temperature increases
Specific humidity increases
Partial pressure of vapour remains constant
Relative humidity remains constant

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Operating the machine at lower speeds
Operating the machine at higher speeds
Raising the higher temperature
Lowering the higher temperature

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Ammonia and lithium bromide
Water and water
Ammonia and water
Water and lithium bromide

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-10.5°C
-77.7°C
-33.3°C
-30°C

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MORE MCQ ON Refrigeration and Air Conditioning

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