Q. Gizzlies are used for separating __________ solids.

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Q. Which of the following clay mixing devices is vacuum operated for deairation of clay?

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Q. Pick out the material having minimum Rittinger's number.

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Q. __________ mills are termed as impactors.

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Q. In case of a revolving mill, wet grinding compared to dry grinding

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Q. To get a fine talc powder from its granules, the equipment used is

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Q. For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is

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Q. At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied:

P₀ = ρ/ρN³ D⁵ : Power number
Re = ρ N D²/μ: Reynold's number

N is the impeller rotational speed, and D is the impeller diameter.

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Q. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

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Q. Rittinger's crushing law states that

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Q. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers' ?

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Q. Sphericity of pulverised coal is

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Q. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

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Q. Separation of materials of the same density based on their sizes by using then-different rates of flow is called

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Q. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a

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Q. Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are

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Q. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

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Q. Screen capacity is expressed in terms of

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Q. A screen is said to be blinded, when the

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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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