Mechanical Operations - Section 1

Directions to Solve

Mechanical Operations - Section 1

You can find the problems related to mechanical operation and can
solve these problems to test your aptitude ability.

1.

__________ is the most commonly used 'filter aid'.

A.	Diatomaceous earth
B.	Fuller's earth
C.	Vermiculite
D.	Semi-plastic clay

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

2.

200 mesh screen means 200 openings per

A.	cm2
B.	cm
C.	inch
D.	inch2

Answer: Option C

Explanation:

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3.

Balls for ball mills are never made of

A.	forged/cast steel
B.	lead
C.	cast iron
D.	alloy steel

Answer: Option B

Explanation:

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4.

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.

A.	impact
B.	roll
C.	vibratory
D.	none of these

Answer: Option A

Explanation:

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5.

Jigging is a technique by which different particles can be

A.	separated by particle size.
B.	separated by particle density.
C.	separated by particle shape.
D.	mixed.

Answer: Option A

Explanation:

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6.

In case of a hammer crusher,

A.	crushing takes place by impact breaking.
B.	maximum acceptable feed size is 30 cms.
C.	reduction ratio can be varied by adjusting the distance from cage to hammers.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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7.

The main size reduction operation in ultrafine grinders is

A.	cutting
B.	attrition
C.	compression
D.	impact

Answer: Option B

Explanation:

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8.

Sulphuric acid mist is arrested by using a __________ scrubber.

A.	packed wet
B.	hollow wet
C.	venturi
D.	co-current

Answer: Option C

Explanation:

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