Question 21 : Pine oil used in froth floatation technique acts as a/an
1. collector
2. frother
3. activator
4. modifier
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Question 22 : Length/diameter ratio of a ball mill is
1. <1
2. 1
3. >1
4. 5
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Question 23 : Which of the following mechanical conveyors does not come under the division 'carriers' ?
1. Bucket elevator
2. Apron conveyor.
3. Belt conveyor
4. Screw conveyor
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Question 24 : Which of the following is a vacuum filter ?
1. Tank filter (Nutsch filter)
2. Filter press
3. Batch basket centrifuge
4. Rotary disc filter
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Question 25 : Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm)
1. 0.01 L.S
2. L.S
3. L.S/0.087
4. 0.087 L.S
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Question 26 : Screen capacity is not a function of
1. screening mechanism.
2. screening surface.
3. its openings size.
4. atmospheric humidity.
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Question 27 : Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
1. easier grindability
2. poor grindability
3. high power consumption in grinding
4. none of these
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Question 28 : __________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.
1. Rubbon blender
2. Muller
3. Banbery
4. Tumbler
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Question 29 : Dust laden air can be purified using a
1. gravity settler
2. cyclone separator
3. tubular centrifuge
4. bag filter
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Question 30 : In case of a hammer crusher, the
1. maximum feed size may be 50 mm.
2. minimum product size is 3 mm.
3. feed may be highly abrasive (Moh's scale >5).
4. rotor shaft carrying hammers can be vertical or horizontal.
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