Question 11 : Bond crushing law
1. calls for relatively less energy for the smaller product particles, than does the Rittinger law.
2. is less realistic in estimating the power requirements of commercial crushers.
3. states that the work required for the crushing is proportional to the new surface created.
4. states that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio
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Question 12 : increasing the capacity of a screen __________ the screen effectiveness.
1. decreases
2. none of these
3. increases
4. does not effect
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Question 13 : Filtration of water in a paper mill is done by a/an __________ filter.
1. open sand
2. vacuum leaf
3. sparkler
4. plate and frame
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Question 14 : Ball mill is used for
1. crushing
2. coarse grinding
3. fine grinding
4. attrition
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Question 15 : Moore filter is a __________ filter.
1. rotary
2. leaf
3. press
4. sand
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Question 16 : Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
1. <10
2. >10
3. >100
4. <100
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Question 17 : Feed size of ? 25 cms can be accepted by
1. ball mill
2. rod mill
3. fluid energy mill
4. jaw crusher
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Question 18 : Maximum size reduction in a ball mill is done by the, __________ action.
1. cutting
2. impact
3. attrition
4. compression
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Question 19 : The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an
1. bag filter
2. cyclone separator
3. wet scrubber
4. electrostatic precipitator
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Question 20 : Which is the most suitable conveyor for transportation of sticky material ?
1. Screw conveyor
2. Apron conveyor
3. Pneumatic conveyor
4. Belt conveyor
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