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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Aqua ammonia is used as refrigerant in the following type of refrigeration system

Indirect
Direct
Compression
Absorption

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It has low operating pressures
All of these
It is miscible with oil over large range of temperatures
It gives higher coefficient of performance

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Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

3.72 kW
1.86 kW
18.6 kW
7.44 kW

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Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant before passing through the condenser is

Wet vapour
Superheated vapour
Saturated liquid
Dry saturated vapour

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Refrigeration and Air Conditioning
The higher temperature in vapour compression cycle occurs at

Receiver
Expansion valve
Evaporator
Compressor discharge

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Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

(T₂ - T₁)/T₁
T₂/ (T₂ - T₁)
(T₁ - T₂)/T₁
T₁ / (T₂ - T₁)

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MORE MCQ ON Refrigeration and Air Conditioning

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