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Mechanical Operations

Mechanical Operations
Mixing of plastic solids is generally facilitated by

Kneading
Dispersion
None of these
Mastication

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Mechanical Operations
The speed of a rotary drum vacuum filter may be about __________ rpm.

100
500
1
50

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Mechanical Operations
There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.

Tabling
Froth floatation
Jigging
Classification

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Mechanical Operations
Balls for ball mills are never made of

Forged/cast steel
Alloy steel
Lead
Cast iron

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Mechanical Operations
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

200°C and 5 atm
1000°C and 10 atm
1000°C and 500 atm
500°C and 50 atm

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Mechanical Operations
Ball mills and tube mills with flint or porcelain balls are used for size reduction of

Rubber
Limestone
Asbestos
Non-metallic ores

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