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Mechanical Operations

Mechanical Operations
Angle of nip of the crushing rolls does not depend upon the

Product size
Speed of the rolls
Feed size
Diameter of the rolls

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

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

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Mechanical Operations
Balls for ball mills are never made of

Cast iron
Lead
Alloy steel
Forged/cast steel

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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.

0.014
0.007
0.3
50

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Mechanical Operations
Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is

KW. sec/kg
KWh/kg
KWh/sec. kg
Kg/sec

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Mechanical Operations
A tube mill as compared to a ball mill

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
All of these
Employs smaller balls
Gives finer size reduction but consumes more power

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