Multiple Choice Questions on Mechanical OperationsThe Following Section consists of Multiple Choice Questions on Fluid Mechanics.
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Mechanical Operations MCQ
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Question 1 of 20
1. Question
1 pointsShort distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
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Question 2 of 20
2. Question
1 pointsEquivalent diameter of a particle is the diameter of the sphere having the same
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Question 3 of 20
3. Question
1 pointsPick out the wrong statement.
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Question 4 of 20
4. Question
1 pointsIn continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the
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Question 5 of 20
5. Question
1 pointsFor sizing of fine materials, the most suitable equipment is a
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Question 6 of 20
6. Question
1 pointsWhich of the following is not categorised as a “mechanical operation” ?
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Question 7 of 20
7. Question
1 pointsWhich of the following is a pressure filter ?
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Question 8 of 20
8. Question
1 pointsTabular bowl centrifuges as compared to disk bowl centrifuges
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Question 9 of 20
9. Question
1 pointsPebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
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Question 10 of 20
10. Question
1 pointsPick out the wrong statement pertaining to the roll crushers.
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Question 11 of 20
11. Question
1 pointsWhich of the following is not an ultrafine grinder (colloid mill)?
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Question 12 of 20
12. Question
1 pointsTwo particles are called to be equal settling, if they are having the same.
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Question 13 of 20
13. Question
1 pointsWhich of the following is the most suitable for handling fibrous and dense slurries ?
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Question 14 of 20
14. Question
1 points__________ centrifuge is normally used in sugar mills.
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Question 15 of 20
15. Question
1 pointsSolid particles separation based on the difference in their flow velocities through fluids is termed as the
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Question 16 of 20
16. Question
1 pointsDiatomaceous earth is a/an
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Question 17 of 20
17. Question
1 pointsThe distribution given by microscopic analysis of powder is
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Question 18 of 20
18. Question
1 pointsFor a non-spherical particle, the sphericity
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Question 19 of 20
19. Question
1 pointsIn washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
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Question 20 of 20
20. Question
1 pointsBall mills and tube mills with flint or porcelain balls are used for size reduction of
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Mechanical Operations MCQ 2
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Question 1 of 20
1. Question
1 pointsSize reduction of __________ is accomplished in steam heated rollers and roll crushers.
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Question 2 of 20
2. Question
1 pointsThe capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.
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Question 3 of 20
3. Question
1 pointsWhich of the following is not a part of the Blake jaw crusher?
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Question 4 of 20
4. Question
1 pointsIf a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the
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Question 5 of 20
5. Question
1 pointsFilter aid is used to
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Question 6 of 20
6. Question
1 pointsWhich of the following mineral dressing operations is termed as ‘comminution’?
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Question 7 of 20
7. Question
1 pointsPick out the wrong statement.
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Question 8 of 20
8. Question
1 pointsGravity settling process is not involved in the working of a
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Question 9 of 20
9. Question
1 pointsFroth floatation is the most suitable for treating
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Question 10 of 20
10. Question
1 pointsThe energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μrn is
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Question 11 of 20
11. Question
1 pointsWhich of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
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Question 12 of 20
12. Question
1 pointsPick out the correct statement:
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Question 13 of 20
13. Question
1 pointsRange of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is
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Question 14 of 20
14. Question
1 pointsHighly viscous liquids & pastes are agitated by
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Question 15 of 20
15. Question
1 pointsThe value of ‘angle of nip’ is generally about
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Question 16 of 20
16. Question
1 pointsSize reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
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Question 17 of 20
17. Question
1 pointsSulphuric acid mist is arrested by using a __________ scrubber.
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Question 18 of 20
18. Question
1 pointsThe main size reduction operation in ultrafine grinders is
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Question 19 of 20
19. Question
1 pointsJigging is a technique by which different particles can be
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Question 20 of 20
20. Question
1 pointsCrushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.
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Mechanical Operations MCQ 3
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Question 1 of 20
1. Question
1 pointsBalls for ball mills are never made of
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Question 2 of 20
2. Question
1 points__________ is the most commonly used ‘filter aid’.
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Question 3 of 20
3. Question
1 pointsEnergy consumed for crushing one ton of material ranges from __________ kWh.
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Question 4 of 20
4. Question
1 pointsFor transporting pasty material, one will use a/an
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Question 5 of 20
5. Question
1 pointsWhere 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
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Question 6 of 20
6. Question
1 pointsA tube mill compared to a ball mill
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Question 7 of 20
7. Question
1 pointsTrommels separate a mixture of particles depending on their
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Question 8 of 20
8. Question
1 pointsBasic slag is not ground in
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Question 9 of 20
9. Question
1 pointsGrindability of a material does not depend upon its
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Question 10 of 20
10. Question
1 pointsShape factor for a cylinder whose length equals its diameter is
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Question 11 of 20
11. Question
1 pointsIn case of a hammer crusher, the
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Question 12 of 20
12. Question
1 pointsDust laden air can be purified using a
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Question 13 of 20
13. Question
1 pointsRittinger’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
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Question 14 of 20
14. Question
1 pointsCapacity (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)
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Question 15 of 20
15. Question
1 points__________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.
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Question 16 of 20
16. Question
1 pointsWhich of the following mechanical conveyors does not come under the division ‘carriers’ ?
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Question 17 of 20
17. Question
1 pointsScreen capacity is not a function of
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Question 18 of 20
18. Question
1 pointsWhich of the following is a vacuum filter ?
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Question 19 of 20
19. Question
1 pointsPine oil used in froth floatation technique acts as a/an
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Question 20 of 20
20. Question
1 pointsLength/diameter ratio of a ball mill is
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Mechanical Operations MCQ 4
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Question 1 of 20
1. Question
1 pointsFeed size of ≥ 25 cms can be accepted by
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Question 2 of 20
2. Question
1 pointsWhich is the most suitable conveyor for transportation of sticky material ?
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Question 3 of 20
3. Question
1 pointsThe most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an
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Question 4 of 20
4. Question
1 pointsLaminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
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Question 5 of 20
5. Question
1 pointsFiltration of water in a paper mill is done by a/an __________ filter.
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Question 6 of 20
6. Question
1 pointsMoore filter is a __________ filter.
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Question 7 of 20
7. Question
1 pointsBall mill is used for
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Question 8 of 20
8. Question
1 pointsIn case of a ball mill,
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Question 9 of 20
9. Question
1 pointsMaximum size reduction in a ball mill is done by the, __________ action.
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Question 10 of 20
10. Question
1 pointsincreasing the capacity of a screen __________ the screen effectiveness.
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Question 11 of 20
11. Question
1 pointsBond crushing law
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Question 12 of 20
12. Question
1 pointsFlow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
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Question 13 of 20
13. Question
1 pointsThe controlling resistance in a rotary drum vacuum filter is the __________ resistance.
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Question 14 of 20
14. Question
1 pointsWhich of the following is used for primary crushing of very hard lumpy materials ?
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Question 15 of 20
15. Question
1 pointsCrushing efficiency is the ratio of the
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Question 16 of 20
16. Question
1 pointsThe resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )
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Question 17 of 20
17. Question
1 pointsCement clinker is reduced to fine size by a
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Question 18 of 20
18. Question
1 pointsThe crushed material received for separation is called feed or
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Question 19 of 20
19. Question
1 pointsWhich of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise) ?
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Question 20 of 20
20. Question
1 points__________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.
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