Q. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?

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Q. Percentage of drum submerged in the slurry in case of rotary drum filter is

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Q. Filter medium resistance is that offered by the

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Q. Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the

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Q. Ultrafine grinders operate principally by

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Q. Which of the following comes in the category of primary crusher for hard and tough stone ?

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Q. Crushing efficiency of a machine ranges between __________ percent.

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Q. __________ conveyors are also called scrapers.

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Q. For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?

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Q. Which of the following is a continuous filter?

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Q. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration

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Q. In screen analysis, the notation +5 mm/-10 mm means particles passing through

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Q. Solid particles of different densities are separated by

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Q. During agitation of liquids, power consumption during laminar flow is not proportional to the

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Q. Trommels are revolving screens which normally operate in the range of __________ rpm.

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Q. The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wᵢ, then the same for open circuit grinding will be

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Q. Maximum size reduction in a fluid energy mill is achieved by

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Q. With increase in the capacity of screens, the screen effectiveness

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Q. As particle size is reduced

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Q. Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

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