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This is an MCQ-based quiz on the topic of Psychrometrics.
This includes the following:-
Properties of Atmospheric Air
Psychrometric Chart and Process
Air can be cooled and dehumidified by
Circulating chilled water in tube across air flow
Placing evaporator coil across air flow
Spraying chilled water to air
All of the mentioned
When humidity ratio of air ____ air is said to be dehumidified.
Increases
Decreases
Remains constant
None of the mentioned
When unsaturated air flows over a sheet of water in an insulated chamber
Specific humidity of air decreases
The water evaporates
Both air and water are cooled during evaporation
All of the mentioned
At any dbt, the ____ the difference of wbt reading below below dbt, ____ is the amount of water vapour held in mixture.
Smaller, smaller
Greater, greater
Greater, smaller
Smaller, greater
The wet bulb temperature is the ____ temperature recorded by moistened bulb.
Lowest
Highest
Atmospheric
None of the mentioned
The degree of saturation varies between -1 and 0.
True
False
The degree of saturation is the ratio of
(Saturated specific humidity / actual specific humidity)^2
1/(saturated specific humidity * actual specific humidity)
Saturated specific humidity / actual specific humidity
Actual specific humidity / saturated specific humidity
If water is injected into a container with has unsaturated air,
Water will evaporate
Moisture content of air will decrease
Water will decrease
All of the mentioned
For saturated air, relative humidity is 0%.
True
False
Humidity ratio is given by the ratio of
(Mass of dry air per unit mass of water vapour)^2
1/(mass of dry air * mass of water vapour)
Water vapour mass per unit mass of dry air
Mass of dry air per unit mass of water vapour
Relative humidity is defined as
(Saturation pressure of pure water) / pw
pw / (saturation pressure of pure water)
(Saturation pressure of pure water) / p
p / (saturation pressure of pure water)
When pw is very small,
Saturation temperature of water vapour at pw is less than atmospheric temperature
Water vapour in air exists in superheated state
Air is said to be in unsaturated state
All of the mentioned
In a mixture of dry air and water vapour,
Mole fraction of dry air = pa/p
Mole fraction of water vapour = pw/p
Both of the mentioned
None of the mentioned
Complete dry air exists in nature.
True
False
Dry air consists of
Oxygen, nitrogen
Carbon dioxide
Hydrogen, argon
All of the mentioned
