Chemical Engineering :: Mechanical Operations
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__________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.
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As the product becomes finer, the energy required for grinding
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Gyratory crushers compared to the reciprocating jaw crushers
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The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number.
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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:
Po = 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. -
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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Rittinger's crushing law states that
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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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A.
work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product.
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B.
work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product.
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C.
work required in crushing is proportional to the new surface created.
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D.
for a given machine and feed, crushing efficiency is dependent on the size of the feed & product.
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