Agitator is provided in a crystalliser for____________________?

Related Mcqs:

1. Swenson-Walker crystalliser is a __________________ unit ?

   A. Continuous
   B. Batch
   C. Semi-batch
   D. Cooling (adiabatic)-cum-evaporation

2. 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

3. The ‘shanks system’ of leaching (i.e., counter-current multiple contact leaching) is used for____________________?

   A. Recovery of tannis from the tree barks and woods
   B. Leaching sodium nitrate from Chilean nitrate bearing rock
   C. Both A. and B.
   D. Neither A. nor B.

4. 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.

5. Flights in a rotary dryer are provided to________________?

   A. Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
   B. Reduce the residence time of solid
   C. Increase the residence time of the solid
   D. None of these

6. Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?

   A. (De.t)1/2
   B. (De/t)1/2
   C. (4De/πt)1/2
   D. (4De/t)

7. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?

   A. 100
   B. 10
   C. 5
   D. 1

8. Leaching of coarse solid lumps is also termed as _____________________?

   A. Decoction
   B. Dissolution
   C. Percolation
   D. Agitation and settling

9. Pick out the wrong statement?

   A. The binary diffusivity in liquids is of the order of 10-5 cm2/sec
   B. Molecular diffusion in solid is much faster than that in liquids
   C. Particles movement from higher concentration to lower concentration takes place in diffusion
   process
   D. According to Poiseuille’s law, the permeability decreases with increase in temperature for
   flow of a gas through a given capillary

10. In liquid extraction, if the selectivity is unity, then__________________?

    A. Separation of the constituents is the most effective
    B. No separation will occur
    C. Amount of solvent required will be minimum
    D. Solvent flow rate should be very low