40 TOP MECHANICAL OPERATIONS Online Test – Multiple Choice Questions and Answers 1. In case of a hammer crusher, the feed may be highly abrasive (Moh’s scale >5) rotor shaft carrying hammers can be vertical or horizontal minimum product size is 3 mm maximum feed size may be 50 mm 2. 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 poor grindability high power consumption in grinding easier grindability none of these 3. A tube mill compared to a ball mill produces a coarser product has a higher length/diameter ratio has a higher diameter/length ratio uses much larger balls 4. Which of the following mechanical conveyors does not come under the division ‘carriers’ ? Bucket elevator Apron conveyor Belt conveyor Screw conveyor 5. Screen capacity is not a function of atmospheric humidity screening mechanism screening surface its openings size 6. Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a disc bowl centrifuge batch basket centrifuge sharpies supercentrifuge sparkler filter 7. Shape factor for a cylinder whose length equals its diameter is 0.5 1.5 2 2.5 8. Grindability of a material does not depend upon its elasticity toughness hardness size 9. Basic slag is not ground in compartment mills tube mills ball mills jaw crushers 10. __________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution Tumbler Banbery Muller Rubbon blender Loading … Question 1 of 10
