What is the selectivity index, if the grade of tailings & concentrate is the same ?
What is the selectivity index, if the grade of tailings & concentrate is the same ?
A. 0
B. ∞
C. 1
D. 0.5
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_____________________ baffles are provided in ball mills ?
_____________________ baffles are provided in ball mills ?A. Horizontal
B. No
C. Only two
D. None of theseShape factor for a cylinder whose length equals its diameter is_________________?
Shape factor for a cylinder whose length equals its diameter is_________________?A. 1.5
B. 0.5
C. 1.0
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Filtration of water in a paper mill is done by a/an _______________ filter?A. Open sand
B. Plate and frame
C. Vacuum leaf
D. Sparkler_____________ mills are termed as disintegrators?
_____________ mills are termed as disintegrators?A. Cage
B. Compartment
C. Pebble
D. All tumblingThe basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?
The basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?A. 10
B. 20
C. 25
D. 30Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________?
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________?A. Bronze
B. Stainless steel
C. Flint or porcelain
D. Concrete