A. Cutting
B. Attrition
C. Compression
D. Impact
Related Mcqs:
- Ultrafine grinders operate principally by_________________?
A. Slow compression
B. Impact
C. Attrition
D. Cutting action - The reduction ratio for fine grinders is_____________?
A. 5-10
B. 10-20
C. 20-40
D. As high as 100 - The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ?
A. Df/Dp
B. Dp/Df
C. Df – Dp
D. None of these - 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. - 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 - To get ultrafine particles, the equipment used is a _________________?
A. Ball mill
B. Rod mill
C. Hammer crusher
D. Fluid energy mill - 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 - Temperature of the product during ultrafine grinding_____________________?
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on the material being ground - For the transportation of ultrafine particles, the equipment used is a ____________ conveyor?
A. Belt
B. Pneumatic
C. Screw
D. None of these - 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
