MECHANICAL OPERATIONS QUIZ

At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re0.0

Po ∝ Re1.0

Po ∝ Re-1.0

Po ∝ Re0.5

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Which is the most suitable conveyor for transportation of sticky material?

Belt conveyor

Screw conveyor

Apron conveyor

Pneumatic conveyor

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The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).

D²p

1/D²p

1/Dp

Dp

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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

Flint or porcelain

Stainless steel

Bronze

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Screen capacity is not a function of

Atmospheric humidity

Its openings size

Screening mechanism

Screening surface

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A tube mill as compared to a ball mill

Employs smaller balls

Gives finer size reduction but consumes more power

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)

All of these

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To remove dirt from the flowing fluid, we use a

Strains

Gravity settler

Clarifier

Coagulant

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__________ is a cohesive solid.

Sand

Wet clay

Wheat

None of these

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

Galena

Chromite

Siderite

Rutile

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In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.

Laminar

Turbulent

Plug

None of these

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