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Mechanical Operations

Mechanical Operations
The controlling resistance in a rotary drum vacuum filter is the __________ resistance.

Filter medium
None of these
Cake
Piping

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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.

Ultrafine
Secondary
Primary
Fine

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Mechanical Operations
A screen is said to be blinded, when the

Screen is plugged with solid particles
Undersizes are retained in oversize fraction
Oversizes are present in undersize fraction
Screen capacity is abruptly increased

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Mechanical Operations
Which of the following conveyors cannot be recommended for transportation of abrasive materials?

Chain conveyor
Flight conveyor
Apron conveyor
Belt conveyor

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Mechanical Operations
For separation of sugar solution from settled out mud, we use a __________ filter.

Centrifugal
Rotary drum vaccum
Sparkler
Plate and frame

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Mechanical Operations
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

4.34
1.34
0.5
1

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