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Mechanical Operations

Mechanical Operations
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

0.5
√3
1
√2

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

D
0.5 D
2 D
1.5 D

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Mechanical Operations
Raw materials are charged in the iron blast furnace using

Screw conveyor
Bucket elevator
Skip hoist
None of these

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Mechanical Operations
Which of the following is the most suitable for handling fibrous and dense slurries?

Turbine agitator
Radial propeller agitator
Cone type agitator
Propeller agitator

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Mechanical Operations
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

1.34 Wi
Wi
3.34 Wi
0.5 Wi

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Mechanical Operations
Screen efficiency is

Recovery
Recovery/rejection
None of these
Rejection

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