Question 31 : Trommels separate a mixture of particles depending on their
1. density
2. wettability
3. size
4. electrical & magnetic properties
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Question 32 : Basic slag is not ground in
1. jaw crushers
2. ball mills
3. tube mills
4. compartment mills
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Question 33 : Grindability of a material does not depend upon its
1. toughness
2. elasticity
3. hardness
4. size
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Question 34 : Shape factor for a cylinder whose length equals its diameter is
1. 2
2. 5
3. 0.5
4. 5
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Question 35 : A tube mill compared to a ball mill
1. uses much larger balls.
2. produces a coarser product.
3. has a higher length/diameter ratio.
4. has a higher diameter/length ratio.
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Question 36 : Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a
1. disc bowl centrifuge.
2. sharpies supercentrifuge.
3. sparkler filter.
4. batch basket centrifuge.
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Question 37 : For transporting pasty material, one will use a/an
1. screw colaveyor
2. belt conveyor
3. apron conveyor
4. bucket elevator
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Question 38 : __________ is the most commonly used 'filter aid'.
1. Diatomaceous earth
2. Fuller's earth
3. Vermiculite
4. Semi-plastic clay
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Question 39 : Balls for ball mills are never made of
1. lead
2. forged/cast steel
3. cast iron
4. alloy steel
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Question 40 : Energy consumed for crushing one ton of material ranges from __________ kWh.
1. 0.01 to 0.1
2. 4 to 5.
3. 2 to 5
4. 0.5 to 5
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