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Mechanical Operations

Mechanical Operations
Separation of materials of the same density based on their sizes by using then-different rates of flow is called

Sorting
Elutriation
Flocculation
Sizing

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Mechanical Operations
Cement clinker is reduced to fine size by a

Tube mill
Ball mill
Roll crusher
Hammer mill

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Mechanical Operations
A cottrel precipitator makes use of the __________ for dusty air cleaning.

Alternating current
Corrona discharge
Electric spark
None of these

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

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

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Mechanical Operations
In case of a hammer crusher, the

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

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Mechanical Operations
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?

Sphere
Raschig rings
Cube
Cylinder (L/D = 1)

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