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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Wet bulb temperature
Dew point temperature
Dry bulb temperature
Specific humidity

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Ammonia
Freon
Brine
Carbon dioxide

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

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

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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)

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

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

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Refrigeration and Air Conditioning
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

Takes place at constant entropy
Takes place at constant temperature
Takes place at constant pressure
Involves no change in volume

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MORE MCQ ON Refrigeration and Air Conditioning

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