Q. Pick out the wrong statement.

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Q. Addition of filter aid to the slurry before filtration is done to ...... of the cake.

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Q. Which of the following terminology is not used for size reduction of materials to fine sizes or powders?

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Q. A tube mill as compared to a ball mill

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Q. Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is

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Q. The sphericity of a cylinder of 1 mm diameter and length 3 mm is

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Q. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

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Q. What is the selectivity index, if the grade of tailings & concentrate is the same ?

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Q. The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a

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Q. Traces of solids are removed from, liquid in a

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Q. Out of the following size reduction equipments, the maximum feed size can be accepted by the

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Q. Bucket elevators are not suitable for the vertical lifting of __________ materials.

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Q. The most common filter aid is

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Q. For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.

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Q. For separation of sugar solution from settled out mud, we use a __________ filter.

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Q. Production rate __________ with increased fineness, with a given energy input to the size reduction machine.

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Q. Gold ore concentration is mostly done using

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Q. Mixing of light fine powder such as insecticides is done by

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Q. Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

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Q. Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?

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