A. Centimetre
B. Screen size
C. Micron
D. Surface area per unit mass
Related Mcqs:
- To get ultrafine particles, the equipment used is a _________________?
A. Ball mill
B. Rod mill
C. Hammer crusher
D. Fluid energy mill - For the transportation of ultrafine particles, the equipment used is a ____________ conveyor?
A. Belt
B. Pneumatic
C. Screw
D. None of these - Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles) ?
A. m/ρ . Vp
B. m . ρ/Vp
C. m . Vp/ρ
D. Vp/m . ρ - 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. - 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 - 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 - ______________ are used for the separation of coarse particles from a slurry of fine particles?
A. Thickeners
B. Classifiers
C. Hydrocyclones
D. Decanters - The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?
A. 6.35 kWh/ton
B. 9.0 kWh/ton
C. 18 kWh/ton
D. 25.4 kWh/ton
