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.Management Sciences
Category: Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is____________________?
0
A. X/(X + 1)
B. X/(1 – X)
C. (1 + X)/X
D. (1 – X)/X
Gaseous diffusion co-efficient increases with increase in the_____________________?
A. Pressure
B. Temperature
C. Both A. & B.
D. Neither A. nor B.
Tower diameter may be decreased by__________________?
A. Using higher reflux ratio
B. Use of increased tray spacing
C. Increasing the liquid flow rate
D. Increasing the vapour flow rate
_______________ equation applies to diffusivities in liquids?
A. Gilliland
B. Hirschfelder
C. Wilke and Chang
D. None of these
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is___________________?
A. L/G
B. G/L
C. Always < 1
D. None of these
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on individual design
With increase in pressure, the relative volatility for a binary system__________________?
A. Increases
B. Decreases
C. Remains same
D. Either A. or B., depends on the system
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?
A. Lower than
B. Higher than
C. Same as
D. Either same or higher than
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