Which of the following is not categorised as a “mechanical operation”?

Related Mcqs:

1. Which of the following mechanical conveyors does not come under the division „carriers‟ ?

   A. Belt conveyor
   B. Bucket elevator
   C. Screw conveyor
   D. Apron conveyor

2. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of „scrappers‟ ?

   A. Bucket conveyor
   B. Flight conveyor
   C. Screw conveyor
   D. Both B. and C.

3. Which of the following mechanical conveyors does not come under the division „scrapers‟ ?

   A. Ribbon conveyor
   B. Flight conveyor
   C. Bucket elevators
   D. Drag conveyor

4. Rittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?

   A. Easier grindability
   B. Poor grindability
   C. High power consumption in grinding
   D. None of these

5. Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?

   A. State or manner of application of the crushing force
   B. Ultimate strength of the material
   C. Elastic constant of the material
   D. All A., B. and C.

6. Which of the following is not used as a surface active agent in a flocculation operation ?

   A. Sodium silicate
   B. Quartz
   C. Lime
   D. Alumina

7. What is the reduction ratio in a fine crushing operation having following feed and product sizes ?

   A. 0.5
   B. 2
   C. 5
   D. 10

8. Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ?

   A. Check plates
   B. Jaw plates
   C. Toggles
   D. Crush shaft

9. In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of _______________ crushing?

   A. Primary
   B. Secondary
   C. Fine
   D. Ultrafine

10. The term ‘angle of nip’ is concerned with the operation of the ____________ crushers?

    A. Jaw
    B. Roll
    C. Gyratory
    D. None of these