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.Management Sciences
Category: Mass Transfer
For the flow of gases through a capillary, with increase in temperature, the permeability __________________ as per Knudsen law?
A. Increases
B. Decreases
C. Remain same
D. Either A. or B.; depends on the gas
The dew point of an unsaturated gas-vapor mixture does not depend upon the _________________ of the mixture?
A. Composition
B. Temperature
C. Total pressure
D. All A, B. and C.
Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure. Nitrobenzene will distil off _______________ °C?
A. At < 100
B. At > 210.6
C. Between 100 and 210
D. None of these
Leaching rate is independent of the________________?
A. Agitation
B. Temperature
C. Particle size
D. None of these
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the ________________ of a fibre ?
A. Electrical resistance
B. Thermal conductivity
C. Strength
D. None of these
A coalescer in a mixer-settler liquid-liquid extraction column______________________?
A. Comprises of thin bed of substances of extended surface having high porosity
B. Helps in increasing the bubble size entering the settler
C. Helps in increasing the settling rate of the bubbles
D. All ‘a’, ‘b’, & ‘c’
In a binary system, separation is very efficient, when the relative volatility is_______________?
A. 1
B. > 1
C. < 1
D. 0.5
If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively ?
A. [xD/(RD + 1)], [RD/(RD + 1)]
B. [RD/(RD + 1)], [xD/(xD + 1)]
C. [xD/(RD + 1)], [(RD + 1)/RD]
D. None of these
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as_____________________?
A. Ri = Re/(1 – Re)
B. Ri = (1 – Re)/Re
C. Ri = Re
D. Ri = Re/(1 + Re)
Sand is dried in foundries in a ______________________drier?
A. Rotary
B. Fluidised bed
C. Vacuum
D. Spray
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