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Psychrometer determines the
A Humidity of gases
B Moisture content of solids
C Water of crystallisation
D Hygroscopic nature of solids
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
Dew point temperature always gives an indication of the __________ of the moist air.
A Dryness
B Moisture content
C Coolness
D Latent heat
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
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
A Which lies between the dry bulb and wet bulb temperatures of the incoming stream
B Which lies between the wet bulb and dew point temperatures of the incoming stream
C Which is lower than the dew point temperature of the incoming stream
D Of adiabatic saturation of incoming stream
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
A Fading of dyes on textiles
B Corrosion, tarnishing & soiling of metals
C Reduced strength of textiles
D All of the above
Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?
A Dew point
B Humidity ratio
C Wet bulb temperature
D None of these
__________ remains constant during the adiabatic cooling of moist air.
A Wet bulb temperature
B Dry bulb temperature
C Relative humidity
D Specific humidity
The dew point of moist air becomes __________ with decrease in its relative humidity.
A Less than the wet bulb temperature
B More than the wet bulb temperature
C More than the dry bulb temperature
D Equal to wet bulb temperature
The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
A 0
B 100
C 50
D None of these

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