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Mechanical Operations

Mechanical Operations
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

D²
√d
1/d
D

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Mechanical Operations
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?

1
0.5
0.66
2.76

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

Ball and pebble
Compartment
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
In constant pressure filtration,

Resistance decreases with time
Rate of filtration is constant
Rate of filtration increases with time
Rate of filtration decreases with time

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Mechanical Operations
The sphericity of a solid particle of cubical shape is

(π/6)1/2
(π/6)1/3
π
π/3

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