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Mechanical Operations

Mechanical Operations
Gizzlies are used for separating __________ solids.

Coarse
None of these
Fine
Any size

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Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Concrete
Bronze
Stainless steel
Flint or porcelain

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Mechanical Operations
General mechanism of size reduction in intermediate and fine grinder is by

Impact and attrition
Compression
Compression and tearing
Cutting action

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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

None of these
0.4
0.6
0.1

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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
Which of the following is a continuous filter?

Plate and frame filter
None of these
Cartridge filter
Shell and leaf filter

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