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Mechanical Operations

Mechanical Operations
Which of the following must be stored in silos and not in open yard?

High V.M. bituminous coal
Sand
None of these
Coke breeze

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Mechanical Operations
Stamp mills are generally used for crushing

Gold ores
Diamond
Iron ores
Talc

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Mechanical Operations
A tube mill as compared to a ball mill

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
Employs smaller balls
All of these
Gives finer size reduction but consumes more power

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Mechanical Operations
The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

Same as
2.5 times
10 times
5 times

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Mechanical Operations
Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

Tube mill
Ball mill
Hammer crusher
Jaw crusher

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Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

0.007
0.014
50
0.3

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