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Mechanical Operations

Mechanical Operations
Percentage of drum submerged in the slurry in case of rotary drum filter is

85
30
3
25

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Mechanical Operations
In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.

Secondary
Ultrafine
Primary
Fine

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Mechanical Operations
To get ultrafine particles, the equipment used is a

Ball mill
Hammer crusher
Fluid energy mill
Rod mill

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Mechanical Operations
Filtration of water in a paper mill is done by a/an __________ filter.

Plate and frame
Open sand
Vacuum leaf
Sparkler

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Mechanical Operations
In case of a hammer crusher, the

Rotor shaft carrying hammers can be vertical or horizontal
Feed may be highly abrasive (Moh's scale >5)
Minimum product size is 3 mm
Maximum feed size may be 50 mm

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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
Neither A nor B
Both A & B
Feed particles

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