Related Questions

Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
A D
B $$\frac{1}{{\text{D}}}$$
C D2.5
D $$\frac{1}{{{{\text{D}}^{2.5}}}}$$
For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.
A 10
B 25
C 50
D 75
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
A 35
B 50
C 70
D 85
The main differentiation factor between tube mill and ball mill is the
A Length to diameter ratio
B Size of the grinding media
C Final product size
D Operating speed
Tube mill compared to ball mill
A Produces finer products
B Is long in comparison with its diameter
C Uses smaller balls
D All of the above
A tube mill compared to a ball mill
A Has a higher length/diameter ratio
B Produces a coarser product
C Has a higher diameter/length ratio
D Uses much larger balls
A tube mill as compared to a ball mill
A Employs smaller balls
B Gives finer size reduction but consumes more power
C Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
D All of the above
When the weight of a ball inside the ball mill is just balanced by the centrifugal force,
A The ball abandons its circular path for a parabolic path
B The ball abandans its parabolic path for a circular path
C The ball continues to move on a circular path
D The ball continues to move on a parabolic path
A ball and a bat costs 110 taka. The bat costs 100 taka more than the ball. How much does the ball cost ?
A 5
B 10
C 15
D 100
A box contains 21 balls numbered 1 to 21 . A ball numbered 1 to 21 . A ball is drawn and then another ball is brawn without replacement . What is the probability that both balls are even numbered?
A 2/7
B 3/14
C 8/21
D 5/21

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