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Mechanical Operations

Mechanical Operations
Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.

Drying
All of these
Washing
Filtering

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

Dry cyclone separator
Rotary sprayer scrubber
Filter thickener
Dust catcher

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = Vp/dp sp
Φs = dp Sp/Vp
Φs = 6 dp Sp/Vp
Φs = 6 Vp/dp sp

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Mechanical Operations
Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.

Cage
Both A & B
Hammer
Neither A nor B

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Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

50
0.014
0.3
0.007

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Mechanical Operations
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the

Dewaxing of lubricating oil
Concentration of rubber latex
Separation of isotopes based on their density or molecular weights difference
Separation of cream from milk

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