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.Management Sciences
Category: Mass Transfer
For stripping of a gas in a counter current stripper, the operating line _____________________?
A. Lies above the equilibrium curve
B. Lies below the equilibrium curve
C. Can lie above or below the equilibrium curve
D. Is always parallel to the equilibrium curve
McCabe-Thiele method of binary distillation does not assume that the__________________?
A. Sensible heat changes are negligible compared with latent heat changes
B. Molar latent heats of all components are equal
C. Heat of mixing is negligible
D. None of these
Pick out the correct statement ?
A. Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas
B. The ‘Hatta number’ is important in problems involving gas absorption without chemical
reaction
C. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both
components is linear in the case of steady state equimolal counter-diffusion
D. Total reflux in case of distillation operation requires infinite number of plates for a binary
system separation
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?
A. G/(FG . a)
B. FG/(G . a)
C. (G . a)/FG
D. L/(FG . G)
Calcium ammonium nitrate (a fertiliser) is dried in a _________________ dryer?
A. Rotary
B. Vacuum
C. Tunnel
D. Tray
In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in_________________?
A. Reducing the axial mixing
B. Increasing the rate of extraction
C. Maintaining the concentration difference between the two phases
D. All A , B & C.
Leaching of uranium ore and gold ore is done in_____________________?
A. Centrifugal extractor
B. Pachuca tanks
C. Bollman extractor
D. None of these
The process employing desorption of the absorbed solute by a solvent is called____________________?
A. Elution
B. Osmosis
C. Reverse osmosis
D. Sublimation
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?
A. 5.6 × 10-4
B. 8.5 × 10-4
C. 5.6 × 10-3
D. 8.5 × 10-3
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