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Mechanical Operations

Mechanical Operations
In froth floatation, chemical agent added to cause air adherence is called

Modifier
Frother
Activator
Collector

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

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

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Mechanical Operations
Filter aid is used to

Increase the porosity of the cake
Decrease the pressure drop
Increase the rate of filtration
Act as a support base for the septum

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Mechanical Operations
Trommels employ __________ for screening of materials.

None of these
Fibrous cloth
Punched plate
Woven wire screen

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Mechanical Operations
Which of the following is a batch sedimentation equipment?

Filter thickener
Rotary sprayer scrubber
Dry cyclone separator
Dust catcher

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Mechanical Operations
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

25.4 kWh/ton
6.35 kWh/ton
18 kWh/ton
9.0 kWh/ton

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