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Mechanical Operations

Mechanical Operations
200 mesh seive size corresponds to __________ microns.

200
74
154
24

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Mechanical Operations
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).

S/V
6.V/D.S
V/6D.S
V/D.S

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Mechanical Operations
Sauter mean diameter is the same as the __________ mean diameter.

Arithmetic
Mass
Volume-surface
Geometric

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Mechanical Operations
According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than

0.184
1.84
0.00184
0.0184

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Mechanical Operations
Colloid mills achieve size reduction mainly by

Compression
Cutting
Impact
Attrition

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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
0.02 μm/s
1 μm/s
0.90 μm/s

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