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Mechanical Operations

Mechanical Operations
For spheres, volume shape factor is given by

π(=A/D²)
AD/V
π/6(=V/D³)
2π(=2A/D²)

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Mechanical Operations
Grinding efficiency of a ball mill is of the order of __________ percent.

90-95
75-80
43835
40-50

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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

0.1
None of these
0.6
0.4

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Mechanical Operations
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

15 to 20
10 to 15
3 to 4
8 to 10

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Mechanical Operations
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Capacity of centrifuge is increased
Centrifugal force is doubled
Linear speed of the basket is halved
Linear speed of the basket is doubled

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Mechanical Operations
Dry powdery solid materials are transported by a __________ conveyor.

Bucket
Belt
Screw
None of these

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