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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Air refrigerator works on

Both (A) and (B)
Bell Coleman cycle
Reversed Carnot cycle
None of these

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

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

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Refrigeration and Air Conditioning
The bank of tubes at the back of domestic refrigerator is

Refrigerant cooling tubes
Capillary tubes
Condenser tubes
Evaporator tubes

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

22°C DBT and 60% RH
25°C DBT and 100% RH
25°C DBT and 40% RH
20°C DBT and 80% RH

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called

Dew point temperature
Wet bulb temperature
Dry bulb temperature
None of these

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Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

(e₁ + e₂)/ e₁ + e₂ - e₁e₂
e₁e₂
e₁ + e₂
1/e₁ + 1/e₂

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