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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The freezing point of R-12 is

-86.6°C
-107.7°C
-135.8°C
-95.2°C

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Refrigeration and Air Conditioning
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

Same
More
Less
More or less depending on ambient conditions

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Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

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

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

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

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

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

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Refrigeration and Air Conditioning
The condition of refrigerant after passing through the condenser in a vapour compression system is

Dry saturated vapour
Saturated liquid
Superheated vapour
Wet vapour

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MORE MCQ ON Refrigeration and Air Conditioning

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