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Mechanical Operations

Mechanical Operations
The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).

1/Dp
1/D²p
D²p
Dp

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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

22.1 μm/s
0.90 μm/s
0.02 μm/s
1 μm/s

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Mechanical Operations
__________ mills fall in the category of tumbling mills,

Compartment
Ball and pebble
Rod and tube
All of these

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Mechanical Operations
Compressibility co-efficient for an absolutely compressible cake is

0 to 1
∞
1

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Mechanical Operations
Which of the following is a coarse crusher?

Tube mill
Smooth roll crusher
Toothed roll crusher
Gyratory crusher

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

43832
60 - 75
40 - 50
15 - 20

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