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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

26°C DBT and 60% RH
26°C DBT and 50% RH
20°C DBT and 50% RH
20°C DBT and 60% RH

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Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Increases C.O.P
Decreases C.O.P
O.P remains unaltered
Other factors decide C.O.P

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Refrigeration and Air Conditioning
In Electrolux refrigerator

Ammonia is absorbed in water
Ammonia is absorbed in hydrogen
Ammonia evaporates in hydrogen
Hydrogen evaporates in ammonia

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Refrigeration and Air Conditioning
Short horizontal lines on pressure-enthalpy chart show

Constant total heat lines
Constant temperature lines
Constant entropy lines
Constant pressure lines

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is very wet vapour

After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the compressor

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Refrigeration and Air Conditioning
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Normal cooling
Super-cooling
None of the listed here
Sub-cooling or under-cooling

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MORE MCQ ON Refrigeration and Air Conditioning

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