21. Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation? A. check plates B. jaw plates C. toggles D. crush shaft Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
22. Floatation beneficiation is based on the principle of A. Miiieral surface hydrophbicity B. Gravity difference C. Chemical reactivity D. Partical size difference Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
23. Role of a "collector" in floatation is to A. form a water repelling film on the mineral surface B. create and stabilise the froth C. act as a surfactant D. collect the minerals according to their specific gravity Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
24. Electrostatic separation of minerals from each other is based on their differences in the following property: A. Densities B. Magnetic permeabilites C. Electrical conductivities D. Hardness Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
25. Cyclones are primarily used for A. comminution B. concentration C. dewatering D. classification Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
26. Ore concentration by Jigging is based on the . . . . . . . . of the particles. A. difference in specific gravities B. wettability C. Shape D. none of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
27. The process for selectively separating hydrophobic materials from hydrophilic. A. Froth flotation B. Gravity separation C. Magnetic separation D. None of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
28. As particle size is reduced A. screening becomes progressively more difficult B. screening becomes progressively easier C. capacity & effectiveness of the screen is increased D. none of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
29. Fibrous material is broken by a A. roll crusher B. squirrel-cage disintegrator C. ball mill D. none of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
30. The screen effectiveness . . . . . . . . with increase in the capacity of the screen. A. Decreases B. increases C. increases linearly D. remains unaffected Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
