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Mechanical Operations

Mechanical Operations
Which of the following comes in the category of primary crusher for hard and tough stone?

None of these
Gyratory crusher
Jaw crusher
Cone crusher

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Mechanical Operations
Reciprocal of sphericity is termed as the

Shape factor
Sauter diameter
Specific surface ratio
Surface area per unit mass

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Mechanical Operations
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Np → constant
Np ∝ √NRe
Np ∝ 1/NRe
Np ∝ NRe

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Mechanical Operations
A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.

Tube
Pebble
Compartment
Rod

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Mechanical Operations
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

2
√3
1.5
√2

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Mechanical Operations
During agitation of liquids, power consumption during laminar flow is not proportional to the

Cube of impeller diameters
Square of rotational speed
Density of the liquid
Viscosity of the liquid

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