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Mechanical Operations

Mechanical Operations
Ore concentration by jigging is based on the difference in the __________ of the particles.

Specific gravities
None of these
Wettability
Shape

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Mechanical Operations
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.

Secondary
Ultrafine
Fine
Primary

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Mechanical Operations
The inlet pressure in a constant rate filtration

Remains constant
Increases continuously
None of these
Decreases gradually

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Mechanical Operations
Basic slag is not ground in

Jaw crushers
Tube mills
Compartment mills
Ball mills

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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.

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

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Mechanical Operations
A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is

None of these
0.1
0.6
0.4

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