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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The difference between dry bulb temperature and dew point temperature, is called

Degree of saturation
Dry bulb depression
Wet bulb depression
Dew point depression

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Refrigeration and Air Conditioning
The formation of frost on cooling coils in a refrigerator

Increases power consumption
Improves C.O.P. of the system
Increases heat transfer
Reduces power consumption

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

2 kW
4 kW
3 kW
1 kW

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Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Condenser to the evaporator
Condenser to the expansion valve
Expansion valve to the evaporator
Evaporator to the thermostat

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It reacts with copper and its alloys.
It is toxic to mucous membranes.
It requires large displacement per TR compared to fluoro carbons.
All of these

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Decreases
Increases
None of these
Remains constant

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MORE MCQ ON Refrigeration and Air Conditioning

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