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.Management Sciences
Category: Mass Transfer
The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?
A. Parallel
B. Straight
C. Both parallel and straight
D. Neither parallel nor straight
With increase in the concentration of the adsorbate, the integral heat of adsorption____________________?
A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on the type of adsorbate
Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes ?
A. Packed towers
B. Plate towers
C. Spray towers
D. Wetted wall columns
Surface renewal model of mass transfer was enunciated by___________________?
A. Toor and Marcello
B. Fick
C. Danckwerts
D. Stefan
As the reflux ratio decreases, the_________________?
A. Separation becomes more efficient
B. Number of plates increases
C. Column diameter increases
D. None of these
For absorbers, high pressure drop results in___________________?
A. Increased efficiency
B. Decreased efficiency
C. High operating cost
D. Better gas liquid contact
In the absorption of ammonia in water, the main resistance to absorption is by the _________________ phase?
A. Liquid
B. Gas
C. Both A. & B.
D. Neither A. nor B.
Under conditions of flooding in packed tower, the gas pressure drop___________________?
A. Decreases rapidly
B. Increases rapidly
C. Remain constant
D. Is maximum
For water-ethanol system, the minimum reflux ratio_____________________?
A. Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
B. Is computed from the intercept of the operating line
C. Cannot be computed
D. Is the optimum reflux ratio
Which of the following employs an accessory known as ‘drift eliminator’ ?
A. Multiple effect evaporator
B. Mechanical draft cooling tower
C. Rotary dryer
D. Rotating disc contactor
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