Category: Mass Transfer

A. Reboiler is not used in open steam distillation
B. The separation of solutes of different molecular sizes in a liquid solution by use of a suitable
membrane is called dialysis
C. Freeze drying is used for the drying of fish
D. Fenske-Underwood equation is used for calculating theoretical number of plates in a
distillation column at normal operating reflux condition

A. Evaporation
B. Drying
C. Crystallisation
D. Both B. and C.

A. Dew point < wet bulb temperature
B. Wet bulb temperature < dry bulb temperature
C. Both A. and B.
D. Neither A. not B.

A. High evaporation losses of water
B. High pressure drop of the gas
C. Difficulty in its fabrication
D. None of these

A. Hot cupric oxide
B. Heated charcoal
C. Cold Ca(OH)2
D. Alumina

A. -ve
B. +ve
C. 1
D. -1

A. Means discarding a small fraction of circulating water to prevent and limit the concentration
of salt and impurities
B. Increases the scale forming tendencies of water
C. Is undesirable
D. All A., B. & C.

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

A. Plate
B. Baffle
C. Packed
D. None of these

A. Operating line lies above the equilibrium line
B. Operating line lies below the equilibrium line
C. Both operating and equilibrium lines are parallel
D. Pressure drop in the column is very high