Swenson-Walker crystalliser is a __________________ unit ?

Related Mcqs:

1. In most of the vacuum crystalliser, vacuum is generally produced by means of a_____________________?

   A. Suction pump
   B. Compressed air jet
   C. Steam jet ejector with a barometric condenser
   D. None of these

2. Agitator is provided in a crystalliser for____________________?

   A. Avoiding deposition on cooler surfaces
   B. Formation of nuclei
   C. Crystal growth
   D. All A., B. and C.

3. The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by __________________?

   A. Raising the temperature
   B. Lowering the total pressure
   C. Both A. and B.
   D. Neither A. nor B.

4. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?

   A. 2.0
   B. 1.56
   C. 1.0
   D. 0.56

5. 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)

6. Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?

   A. 25%
   B. 50%
   C. 70%
   D. 90%

7. Operating velocity in a packed tower is usually __________________ the flooding velocity ?

   A. Half
   B. Twice
   C. Equal to
   D. More than

8. The percentage humidity is less than the relative humidity only at __________________ percent humidity?

   A. Zero
   B. Hundred
   C. Both zero and hundred
   D. None of these

9. The efficiency of a plate column will be maximum, when the flow is ideal __________________ the plate?

   A. Across
   B. Above
   C. Both A. & B.
   D. Neither A. nor B.

10. 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