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Mechanical Operations

Mechanical Operations
Percentage of drum submerged in the slurry in case of rotary drum filter is

30
25
3
85

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Mechanical Operations
Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.

None of these
Gyratory
Blake jaw
Toothed roll

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Mechanical Operations
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).

S/V
V/D.S
6.V/D.S
V/6D.S

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Mechanical Operations
Sedimentation on commercial scale occurs in

Thickeners
Rotary drum filters
Cyclones
Classifiers

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Mechanical Operations
Which of the following is not used as a surface active agent in a flocculation operation?

Lime
Sodium silicate
Quartz
Alumina

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Mechanical Operations
Close circuit grinding by a ball mill with air sweeping employs a

Cyclone separator between mill & classifier
Classifier
Both A & B
Neither A nor B

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