| 16. | Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (a).A
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| 17. | What is the reduction ratio in a fine crushing operation having following feed and product sizes?
 |
| a. | 0.5 |
| b. | 2 |
| c. | 5 |
| d. | 10 |
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Answer: (b).2
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| 18. | The value of 'angle of nip' is generally about |
| a. | 16° |
| b. | 32° |
| c. | 52° |
| d. | 64° |
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Answer: (b).32°
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| 19. | Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills. |
| a. | metalliferrous ores |
| b. | non-metallic ores |
| c. | basic slags |
| d. | asbestos & mica |
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Answer: (a).metalliferrous ores
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| 20. | Sulphuric acid mist is arrested by using a __________ scrubber. |
| a. | packed wet |
| b. | hollow wet |
| c. | venturi |
| d. | co-current |
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Answer: (c).venturi
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