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Mechanical Operations

Mechanical Operations
In froth floatation, chemical agent added to cause air adherence is called

Activator
Modifier
Frother
Collector

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Mechanical Operations
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

0.90 μm/s
1 μm/s
22.1 μm/s
0.02 μm/s

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Mechanical Operations
To remove very small amount of tiny solid impurities from liquid, we use a

Pressure filter
Coagulant
Vacuum filter
Centrifugal filter

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Mechanical Operations
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?

Crush shaft
Toggles
Jaw plates
Check plates

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Mechanical Operations
In closed circuit grinding as compared to open circuit grinding, the

Specific surface of product is more
Product has lesser size uniformity
Production rate at a given limiting size is lower
Operation is economical

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Mechanical Operations
A fluid energy mill is used for

Grinding
Ultra grinding
Crushing
Cutting

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