Related Mcqs:

1. Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?

   A. Jet mills
   B. Fluid energy mill
   C. Micronizer
   D. All A., B. and C.

2. Size measurement of ultrafine particles can be best expressed in terms of___________________?

   A. Centimetre
   B. Screen size
   C. Micron
   D. Surface area per unit mass

3. To get ultrafine particles, the equipment used is a _________________?

   A. Ball mill
   B. Rod mill
   C. Hammer crusher
   D. Fluid energy mill

4. The main size reduction operation in ultrafine grinders is_____________?

   A. Cutting
   B. Attrition
   C. Compression
   D. Impact

5. Which of the following is not an ultrafine grinder (colloid mill) ?

   A. Micronizers
   B. Agitated mills and fluid energy mills
   C. Toothed roll crusher
   D. Hammer mills with internal classification

6. Ultrafine grinders operate principally by_________________?

   A. Slow compression
   B. Impact
   C. Attrition
   D. Cutting action

7. For the transportation of ultrafine particles, the equipment used is a ____________ conveyor?

   A. Belt
   B. Pneumatic
   C. Screw
   D. None of these

8. In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?

   A. Concentrate
   B. Tailing
   C. Middling
   D. None of these

9. During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?

   A. Density of the liquid
   B. Viscosity of the liquid
   C. Cube of impeller diameters
   D. Square of rotational speed

10. Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?

    A. 200°C and 5 atm
    B. 1000°C and 10 atm
    C. 500°C and 50 atm
    D. 1000°C and 500 atm