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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The boiling point of ammonia is

-10.5°C
-33.3°C
-77.7°C
-30°C

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Refrigeration and Air Conditioning
The air cooling system mostly used in transport type aircrafts is

Bootstrap air cooling system
Simple evaporative air cooling system
All of the listed here
Simple air cooling system

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Increases heat transfer rate
Results in loss of heat due to poor heat transfer
Is immaterial
Can be avoided by proper design

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Refrigeration and Air Conditioning
In vapour compression refrigeration system, refrigerant occurs as liquid between

Compressor and evaporator
Compressor and condenser
Condenser and expansion valve
Expansion valve and evaporator

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Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Automatic expansion valve
Thermostatic expansion valve
High side float valve
Low side float valve

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Refrigeration and Air Conditioning
In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

Collect liquid refrigerant and prevent it from going to compressor
Superheat the vapour
Collect vapours
Detect liquid in vapour

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MORE MCQ ON Refrigeration and Air Conditioning

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