A. Titanium oxide
B. Calcium oxide
C. Cobalt oxide
D. Manganese oxide
Related Mcqs:
- For benefication of iron ore, the most commonly used method is______________?
A. Flocculation
B. Froth floatation
C. Jigging & tabling
D. None of these - Gold ore concentration is mostly done using___________________?
A. Jigging
B. Tabling
C. Froth floatation
D. Elutriation - Ore concentration by jigging is based on the difference in the ______________ of the particles?
A. Specific gravities
B. Wettability
C. Shape
D. None of these - Raw materials are charged in the iron blast furnace using____________________?
A. Bucket elevator
B. Skip hoist
C. Screw conveyor
D. None of these - 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 - Traces of liquid tar fog present in coke oven gas is separated using____________________?
A. Electrostatic precipitator
B. Cyclone separator
C. Strainer
D. None of these - Which of the following is a vacuum filter ?
A. Filter press
B. Rotary disc filter
C. Batch basket centrifuge
D. Tank filter (Nutsche filter) - Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?
A. Sphere
B. Cube
C. Cylinder (L/D = 1)
D. Raschig rings - Which of the following conveyors cannot be recommended for transportation of abrasive materials ?
A. Belt conveyor
B. Apron conveyor
C. Flight conveyor
D. Chain conveyor - Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?
A. Wet grinding in low viscous suspension
B. Wet grinding in high viscous suspension
C. Dry grinding of large particles (upto 1.25 cms)
D. Dry grinding of large particles in un-baffed mills
