Q.1.
The ball mill can be best used for which kind of feed?
- a) Wet and Dry
- b) Coarse and Fine
- c) Rocks and Bricks
- d) Any kind of feed
Q.2.
What is the ratio of length to diameter of tube mill?
- a) 4:1
- b) 3
- c) Both 3 and 4:1
- d) 1:2
Q.3.
Which of the following forces act on the tumbling mill?
- a) Tangential force
- b) Centrifugal force
- c) Circular force
- d) Gravitational force
Q.4.
Which of the following is true, when operating speed is less than critical speed?
- a) No grinding
- b) Effective grinding
- c) Best grinding
- d) Bold grinding
Q.5.
What is the angle of nip for ball mill?
- a) 4π2n2 (R-d)/g
- b) 4π2n2 (R+d)/g
- c) 4π2n2 (R-r)/g
- d) 4π2n2 (R-n)/g
Q.6.
At critical speed, α = 0 and cos α =what is critical speed?
- a) n = nc
- b) 2π = nc
- c) g = nc
- d) gn= nc
Q.7.
What does the below equation represent?
- a) Natural speed
- b) Full speed
- c) Optimum speed
- d) Critical speed
Q.8.
What is percentage of tumbling mill speed?
- a) 80 to 100%
- b) 65 to 80%
- c) 50 to 90%
- d) 10 to 50%
Q.9.
Which of the following uses shearing action?
- a) Buhrstone mill
- b) Tumbling mill
- c) Rod mill
- d) Ball mill
Q.10.
What is the feed size for a buhrstone mill?
- a) Size of peat
- b) Size of rock
- c) Size of grain
- d) Any size