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Mechanical Operations

Mechanical Operations
Optimum ratio of operating speed to critical speed of a trommel is

1.33-1.45
0.5-2
0.33-0.45
1.5-2.5

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Mechanical Operations
A fluid energy mill is used for

Cutting
Ultra grinding
Crushing
Grinding

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Mechanical Operations
Mass flow of granular solid (M) through a circular opening of dia, D follows

M ∝ D³
M ∝ D²
M ∝ D
M ∝ √D

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Mechanical Operations
The mechanism of size reduction by a hammer mill is by impact and attrition between the

Grinding element & the housing
Both A & B
Neither A nor B
Feed particles

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Mechanical Operations
The distribution given by microscopic analysis of powder is

Area
Volume
Number
Length

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Mechanical Operations
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.

Neither A nor B
Pressure
Both A & B
Rate

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