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Mechanical Operations

Mechanical Operations
Which of the following screens has the maximum capacity?

Vibrating screen
Shaking screen
Trommels
Grizzlies

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Mechanical Operations
Length/diameter ratio of a ball mill is

> 1
< 1
1.5
1

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Mechanical Operations
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?

Froth floatation
Spiral separator
Baum jig washer
Trough washer

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Mechanical Operations
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

Sodium carbonate
Calcium carbonate
Cresylic acid
Copper sulphate

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Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.62
0.68
0.58
0.5

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Mechanical Operations
Size reduction mechanism used in Jaw crushers is

Cutting
Attrition
Impact
Compression

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