Mass Transfer Mcqs
Q.1: Pick out the wrong statement ?
A. The mole fraction of solute is directly proportional to the molality of a dilute solution_
B. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both[
C. components is nonlinear in the case of steady state unimolal unidirectional diffusionU
D. Azeotropes obey Raoults law at all temperature1
Q.2: _____________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid ?
A. Dew point
B. Bubble point
C. Dry bulb temperature
D. Wet bulb temperature
Q.3: For absorbers, high pressure drop results in___________________?@
A. Increased efficiency
B. Decreased efficiency
C. High operating cost
D. Better gas liquid contact
Q.4: The binary diffusivity in gases at atmospheric conditions is about ___________________?W
A. 10-9 cm/sec
B. 10-1 cm2/sec
C. 10-3 sec/cm
D. 10-4 cm2/sec2
Q.5: Occurrence of case hardening during drying of a high moisture solid cake _______________ the drying rate?o
A. Increases
B. Decreases
C. Does not affect
D. Exponentially increases
Q.6: Refractory bricks are usually dried in a ________________ dryer?@
A. Tray
B. Tunnel
C. Conveyor
D. Festoon
Q.7: The most common packing used in industrial operations is _______________ rings?O
A. Raschig
B. Lessing
C. Cross-partition
D. Single spiral
Q.8: Capacity of a rotary dryer depends on its __________________?=
A. rpm
B. Inclination with ground surface
C. Both and
D. Neither nor
Q.9: Berl saddle made of carbon cannot be used for ___________________?B
A. Alkalis
B. SO2
C. H2SO4
D. Oxidising atmosphere
Q.10: For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of _______________ microns (1 mm = 1000 microns)?
A. 1-5
B. 10-60
C. 200-300
D. > 500

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