31. Screw conveyors are
32. A simple close grinding circuit may consist of a
33. When the weight of the ball inside a ball mill is just balanced by the centrifugal force, the ball
34. Match the reagents in Group 1 with their properties in Group 2, in the context of froth floatation.
Group 1
Group 2
P. Frother
1. Alters the chemical nature of mineral surfaces so that they become hydrophobic due to action of collector
Q. Activator
2. Absorbs on air-water interface and reduces surface tension to stabilise the bubble
R. Regulator
3. Increases the selectivity of floatation by rendering certain mineral hydrophilic
S. Depressant
4. Modifies the action of collector either by intensifying or reducing its water repellant effect
| Group 1 | Group 2 |
| P. Frother | 1. Alters the chemical nature of mineral surfaces so that they become hydrophobic due to action of collector |
| Q. Activator | 2. Absorbs on air-water interface and reduces surface tension to stabilise the bubble |
| R. Regulator | 3. Increases the selectivity of floatation by rendering certain mineral hydrophilic |
| S. Depressant | 4. Modifies the action of collector either by intensifying or reducing its water repellant effect |
35. Electrical energy consumed by a jaw crusher is not a function of the
36. 200 mesh screen has 200 openings per
37. Bond crushing law
38. Match the processes in Group 1 with the physical principales in Group 2.
Group 1
Group 2
P. Floatation
1. Differential initial accelaration
Q. Jigging
2. Differential lateral movement
R. Tabling
3. Differential in density
S. Heavy media separation
4. Modification of surface tension
| Group 1 | Group 2 |
| P. Floatation | 1. Differential initial accelaration |
| Q. Jigging | 2. Differential lateral movement |
| R. Tabling | 3. Differential in density |
| S. Heavy media separation | 4. Modification of surface tension |