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Mechanical Operations

Mechanical Operations
The inlet pressure in a constant rate filtration

Remains constant
Increases continuously
None of these
Decreases gradually

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Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Concrete
Bronze
Flint or porcelain
Stainless steel

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

Cage
Hammer
Both A & B
Neither A nor B

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

Washing
All of these
Drying
Filtering

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Mechanical Operations
The opening of a 200 mesh screen (Taylor series) is

0.0047 cm
0.0074 mm
74 mili-microns
0.0074 cm

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 V.W.Dr/ρ
3.6 W.Dr.ρ
3.6 V.W.Dr.ρ
3.6 V.W. ρ

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