A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on the material being ground
Related Mcqs:
- 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 - The main size reduction operation in ultrafine grinders is_____________?
A. Cutting
B. Attrition
C. Compression
D. Impact - 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 - Ultrafine grinders operate principally by_________________?
A. Slow compression
B. Impact
C. Attrition
D. Cutting action - For the transportation of ultrafine particles, the equipment used is a ____________ conveyor?
A. Belt
B. Pneumatic
C. Screw
D. None of these - 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 - 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 - 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
