Mechanical Operations MCQ Questions & Answers | Chemical Engineering

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1.
The critical speed of a trommel (N) is related to its dia (D) as

A. N ∝ 1/√D

B. N ∝ √D

C. N ∝ D

D. N ∝ 1/D

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2.
Cartridge filters are termed as 'edge' filters, because of the fact that the

A. Disks have very sharp edge

B. Solids are not deposited at the edge of the disk

C. Bulk of the solids are removed at the periphery of the disks

D. None of these

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3.
Two particles are called to be equal settling, if they are having the same.

A. Size

B. Specific gravity

C. Terminal velocities in the same fluid & in the same field of force

D. None of these

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4.
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

A. Sedimentation

B. Flocculation

C. Dispersion

D. Centrifugation

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5.
The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)

A. 3.6 AVS.ρ

B. 3.6 A.V.ρ

C. 3.6 A.S. ρ

D. 3.6 AVS/ρ

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