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Mechanical Operations

Mechanical Operations
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is

>100
>10

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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)

1.5 D
2 D
D
0.5 D

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Mechanical Operations
Cartridge filters are termed as 'edge' filters, because of the fact that the

None of these
Bulk of the solids are removed at the periphery of the disks
Disks have very sharp edge
Solids are not deposited at the edge of the disk

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Mechanical Operations
Which of the following can be most effectively used for clarification of lube oil and printing ink?

Precoat filter
Sharpies supercentrifuge
Disc-bowl centrifuge
Sparkler filter

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Mechanical Operations
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?

None of these
Kozney-Karman equation
Leva
Blake-Plummer equation

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Mechanical Operations
Gravity settling process is not involved in the working of a

Hydrocyclone
Classifier
Dorr-thickener
Sedimentation tank

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