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.
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a. | 1 |
b. | 1.5 |
c. | 2 |
d. | 2.5 |
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Answer: (b).1.5
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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).
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a. | A |
b. | B |
c. | C |
d. | D |
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Answer: (b).B
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3. | Critical Speed (Nc) of a ball mill is given by(where R₁ and R₂ are radii of ball mill and the ball respectively).
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a. | A |
b. | B |
c. | C |
d. | D |
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Answer: (b).B
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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 |
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Answer: (c).C
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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
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a. | A |
b. | B |
c. | C |
d. | D |
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Answer: (a).A
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