Answer & Solution
Answer: Option C
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12. Impurities present with minerals is called
13. The material is crushed in a gyratory crusher by the action of
14. Mechanical efficiency of a crusher is defined as the ratio of the
15. 200 mesh sieve size corresponds to . . . . . . . . microns.
16. In case of a ball mil,
17. The aperture size (in μm) of a 200 mesh sieve having a wire diameter of 53 μm is
18. Match the following processes with their physical principles.
Group 1
Group 2
P. Floatation
1. Difference in specific gravity
Q. Jigging
2. Difference in hydrophobicity
R. Heavy media separation
3. Difference in lateral movements
S. Tabling
4. Differential initial accelaration
| Group 1 | Group 2 |
| P. Floatation | 1. Difference in specific gravity |
| Q. Jigging | 2. Difference in hydrophobicity |
| R. Heavy media separation | 3. Difference in lateral movements |
| S. Tabling | 4. Differential initial accelaration |
19. The grinding in hammer crusher takes place due to
20. Match the unit operation in Group I with its corresponding principal in Group II:
Group I
Group II
P. Jigging
1. Modification of surface tension
Q. Tabling
2. Difference in density
R. Heavy media separation
3. Differential initial acceleration
S. Flotation
4. Differential lateral movement
| Group I | Group II |
| P. Jigging | 1. Modification of surface tension |
| Q. Tabling | 2. Difference in density |
| R. Heavy media separation | 3. Differential initial acceleration |
| S. Flotation | 4. Differential lateral movement |