Mechanical Operations - Chemical Engineering Questions and Answers

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Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

metalliferrous ores

non-metallic ores

basic slags

asbestos & mica

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Sulphuric acid mist is arrested by using a __________ scrubber.

packed wet

hollow wet

venturi

co-current

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The main size reduction operation in ultrafine grinders is

cutting

attrition

compression

impact

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In case of a hammer crusher,

crushing takes place by impact breaking.

maximum acceptable feed size is 30 cms.

reduction ratio can be varied by adjusting the distance from cage to hammers.

all (a), (b) and (c).

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Jigging is a technique by which different particles can be

separated by particle size.

separated by particle density.

separated by particle shape.

mixed.

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Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.

impact

roll

vibratory

none of these

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Balls for ball mills are never made of

forged/cast steel

lead

cast iron

alloy steel

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200 mesh screen means 200 openings per

cm²

inch

inch²

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__________ is the most commonly used 'filter aid'.

Diatomaceous earth

Fuller's earth

Vermiculite

Semi-plastic clay