| 1. | General crushing equation is given by following equation. Bond's crushing law is obtained by solving this equation for n = __________ and feed of infinite size.
 |
| a. | 1 |
| b. | 1.5 |
| c. | 2 |
| d. | 2.5 |
| View Answer Report Discuss 50-50! |
|
Answer: (b).1.5
|
| 2. | According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
| View Answer Report Discuss 50-50! |
|
Answer: (b).B
|
| 3. | Critical Speed (Nc) of a ball mill is given by(where R₁ and R₂ are radii of ball mill and the ball respectively).
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
| View Answer Report Discuss 50-50! |
|
Answer: (b).B
|
| 4. | Which of the following equations is Rittinger's crushing law ?
(where P = power required by the machine, m = feed rate, k = a constant, D̅sa & D̅sb = volume surface mean diameter of feed & product respectively.)  |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
| View Answer Report Discuss 50-50! |
|
Answer: (c).C
|
| 5. | About 2-3 hp, power per gallon of a thin liquid provides vigrous agitation in an agitator. 'Power number' in agitation is given by
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
| View Answer Report Discuss 50-50! |
|
Answer: (a).A
|