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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Q. Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

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Q. For efficient grinding, ball mills must be operated

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Q. In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

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Q. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

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Q. The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

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Q. Pick out the wrong statement pertaining to the turbine agitator.

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