E-PolyLearning

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
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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
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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
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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
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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
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Answer: (a).A

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