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Mass Transfer

For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around____________________?

Mass Transfer /
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around____________________?

A. 0.60
B. 0.24
C. 1
D. 0.72

For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around____________________? Read More »

Mass Transfer

To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate) ____________________?

Mass Transfer /
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate) ____________________?

A. Increase both ‘G’ and ‘S’
B. Decrease both ‘G’ and ‘S’
C. Increase ‘S’ and decrease ‘G’
D. Increase ‘G’ and decrease ‘S’

To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate) ____________________? Read More »

Mass Transfer

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________________?

Mass Transfer /
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________________?

A. Range is 15°F
B. Approach is 10°F
C. Both A. & B.
D. Neither A. nor B.

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________________? Read More »

Mass Transfer

A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ?

Mass Transfer /
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ?

A. Flow rate of inlet air
B. Relative humidity of outlet air
C. Humidity of inlet air
D. Temperature of the solid

A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ? Read More »

Mass Transfer

Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a____________________?

Mass Transfer /
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a____________________?

A. Higher dew point
B. Higher absolute (specific) humidity
C. Higher relative humidity
D. Higher wet bulb temperature

Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a____________________? Read More »

Mass Transfer