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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Q. A __________ mixer resembles a ball mill without balls.

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Q. __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.

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Q. As the product becomes finer, the energy required for grinding

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Q. Gyratory crushers compared to the reciprocating jaw crushers

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Q. The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number.

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Q. The reduction ratio for fine grinders is

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Q. Which of the following is the hardest material ?

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