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Mechanical Operations

Mechanical Operations
Mixing of plastic solids is generally facilitated by

None of these
Mastication
Kneading
Dispersion

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Mechanical Operations
Out of the following size reduction equipments, the maximum feed size can be accepted by the

Jet pulveriser
Tube mill
Jaw crusher
Ball mill

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Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

None of these
Decreasing size of product at constant size of feed
Decreasing machine capacity
Increasing size of feed at constant reduction ratio

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Mechanical Operations
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

Df/Dp
None of these
Df - Dp
Dp/Df

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Mechanical Operations
Xanthates are used in the froth floatation process as a/an

Collector
Frother
Conditioner
Activator

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

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

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