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Mechanical Operations

Mechanical Operations
Which of the following minerals is not subjected to magnetic separation method?

Chromite
Rutile
Siderite
Galena

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Mechanical Operations
What is the selectivity index, if the grade of tailings & concentrate is the same?

0.5
∞
1

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Mechanical Operations
Sauter mean diameter is the same as the __________ mean diameter.

Mass
Geometric
Volume-surface
Arithmetic

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Mechanical Operations
Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called

Thickening
Froth floatation
Clarification
Classification

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Mechanical Operations
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?

Cylinder (L/D = 1)
Cube
Sphere
Raschig rings

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

Filter thickener
Dry cyclone separator
Rotary sprayer scrubber
Dust catcher

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