Related Questions

Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a __________ vapour.
A Superheated
B Desuperheated
C Non-condensable
D None of these
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
When the air temperature is below freezing, the saturation vapour pressure over water is .
A Equal to zero
B Less than the saturation vapour pressure over ice
C Greater than the saturation vapour pressure over ice
D Equal to the saturation vapour pressure over ice
A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
A Dry air
B Moist air
C Saturated air
D Specific humidity
True vapour pressure of a petroleum fraction __________ Reid vapour pressure.
A Is less than
B Is more than
C Is same as
D May be either more or less than
The saturation temperature of steam with increase in pressure increases
A Linearly
B Rapidly first and then slowly
C Slowly first and then rapidly
D Inversely
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by
A Making the volume of thermometer bulb as large as conveniently possible
B Reducing the volume of the capillary to a minimum
C Reducing the volume of the receiving element to a minimum
D All of the above
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be
A Cooled and humidified
B Cooled and dehumidified
C Heated and humidified
D Heated and dehumidified
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because
A Water has a high latent heat of evaporation
B Lewis number is close to unity
C They are always equal under all circumstances
D Solubility of the components of air in water is very small

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