A. 5-10
B. 10-20
C. 20-40
D. As high as 100
Related Mcqs:
- The main size reduction operation in ultrafine grinders is_____________?
A. Cutting
B. Attrition
C. Compression
D. Impact - 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 - 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 - Ultrafine grinders operate principally by_________________?
A. Slow compression
B. Impact
C. Attrition
D. Cutting action - General mechanism of size reduction in intermediate and fine grinder is by __________________?
A. Cutting action
B. Compression
C. Compression and tearing
D. Impact and attrition - Which of the following terminology is not used for size reduction of materials to fine sizes or powders ?
A. Comminution
B. Dispersion
C. Pulverisation
D. Compression - Which of the following achieves the least reduction ratio for a given feed size ?
A. Jaw crusher
B. Roll crusher
C. Cone crusher
D. Gyratory crusher - Kick’s law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick’s constant is_________________?
A. kW. sec/kg
B. kWh/kg
C. kWh/sec. kg
D. kg/sec - Reduction ratio of crushers is the___________________?
A. Ratio of feed opening to discharge opening
B. Ratio of discharge opening to feed opening
C. Determining factor for minimum dia of the feed and the product
D. None of these - ____________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials?
A. Bucket
B. Belt
C. Screw
D. Apron
