The speed of a rotary drum vacuum filter may be about _____________ rpm?

Related Mcqs:

1. Vacuum is applied in _______________ zone, in case of a general type continuous rotary drum vacuum filter?

   A. Filtering
   B. Washing
   C. Drying
   D. All A., B. & C.

2. Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?

   A. √μ
   B. 1/√μ
   C. 1/μ
   D. 1/μ2

3. With increase in drum speed, in a rotary drum filter, the filtration rate_______________?

   A. Increases
   B. Increases linearly
   C. Decreases
   D. Is not affected

4. Percentage of drum submerged in the slurry in case of rotary drum filter is ________________?

   A. 3
   B. 30
   C. 85
   D. 25

5. Filtration capacity of a rotary drum vacuum filter depends upon the_______________?

   A. Cake thickness
   B. Characteristics of the feed slurry
   C. Both A. & B.
   D. Neither A. nor B.

6. The controlling resistance in a rotary drum vacuum filter is the ________________ resistance?

   A. Piping
   B. Cake
   C. Filter medium
   D. None of these

7. Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?

   A. Added to the feed slurry
   B. Pre-coated on the filter medium prior to filtration
   C. Separated from the cake by dissolving solids or by burning it off
   D. All A, B. & C.

8. The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?

   A. Vacuum
   B. Sand
   C. Plate & frame
   D. Rotary

9. Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?

   A. Wet grinding in low viscous suspension
   B. Wet grinding in high viscous suspension
   C. Dry grinding of large particles (upto 1.25 cms)
   D. Dry grinding of large particles in un-baffed mills

10. Which of the following is a vacuum filter ?

    A. Filter press
    B. Rotary disc filter
    C. Batch basket centrifuge
    D. Tank filter (Nutsche filter)