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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

Air
Freon-11
CO2
Freon-22

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

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

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-30°C
-33.3°C
-77.7°C
-10.5°C

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Refrigeration and Air Conditioning
The evolution of heat of solution takes place in ammonia absorption plant when

Weak solution mixes with strong solution
Lithium bromide mixes with ammonia
Ammonia vapour goes into solution
Ammonia vapour is driven out of solution

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Refrigeration and Air Conditioning
Presence of moisture in a refrigerant affects the working of

Condenser
Compressor
Expansion valve
Evaporator

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Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

10°C
15°C
20°C
5°C

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MORE MCQ ON Refrigeration and Air Conditioning

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