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Mechanical Operations

Mechanical Operations
Filter medium resistance is important during the __________ of filtration.

Final stages
Entire process
None of these
Early stages

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Mechanical Operations
The crushed material received for separation is called feed or

Heading
Tailing
Middling
Concentrate

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Mechanical Operations
Trommels are revolving screens which normally operate in the range of __________ rpm.

15 - 20
60 - 75
43832
40 - 50

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Mechanical Operations
Temperature of the product during ultrafine grinding

Remains constant
Increases
Decreases
May increase or decrease ; depends on the material being ground

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Mechanical Operations
Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is

KWh/sec. kg
Kg/sec
KW. sec/kg
KWh/kg

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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
0.02 μm/s
22.1 μm/s

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