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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During heating and dehumidification process, dry bulb temperature

None of these
Remains constant
Increases
Decreases

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = V²/t.cp
NN = hl/k
NN = ρ V l /μ
NN = μ cp/k

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Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

1.25
0.8
0.25
0.5

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Refrigeration and Air Conditioning
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

Carbon dioxide
R-12
Lithium bromide
Sulphur dioxide

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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
7.44 kW
1.86 kW
18.6 kW

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Refrigeration and Air Conditioning
The curved lines on a psychrometric chart indicates

Relative humidity
Dew point temperature
Dry bulb temperature
Wet bulb temperature

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