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 23 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
