chemical engineering MCQs – Page 125

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

2481. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?
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A. Tube mill

B. Pebble mill

C. Rod mill

D. Compartment mill

2482. In saturated gas, the__________________?
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A. Vapour is in equilibrium with the liquid at the gas temperature

B. Vapour is in equilibrium with the liquid at the room temperature

C. None of these

D. Partial pressure of vapour equals the vapour pressure of the liquid at room temperature

2483. Gravity stamp mill is meant for the ___________________ crushing?
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A. Intermediate

B. Ultrafine

C. Primary

D. Fine

2484. Feed size of ? 25 cms can be accepted by _______________________?
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A. Fluid energy mill

B. Rod mill

C. Ball mill

D. Jaw crusher

2485. A screen is said to be blinded, when the___________________?
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A. Under-sizes are retained in oversize fraction

B. Screen capacity is abruptly increased

C. Screen is plugged with solid particles

D. Over-sizes are present in undersize fraction

2486. During filtration operation, the filtrate encounters the resistance of the ___________________?
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A. All A., B. and C.

B. Cake

C. ium

D. Filter medium

E. Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter

2487. Maximum size reduction in a fluid energy mill is achieved by___________________?
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A. Interparticle attrition

B. Impact

C. Cutting

D. Compression

2488. Which of the following is not used as filter aid ?
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A. Asbestos

B. Rice husk

C. Purified wood cellulose

D. Diatomaceous earth

2489. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?
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A. D

B. 0.5 D

C. 1.5 D

D. 2 D

2490. Leaching of sugar from sugar beets is done by___________________?
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A. Hexane

B. Lime water

C. Dilute H2SO4

D. Hot water

2491. A fluid energy mill is used for_________________?
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A. Crushing

B. Cutting

C. Ultra grinding

D. Grinding

2492. Percentage of drum submerged in the slurry in case of rotary drum filter is ________________?
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A. 85

B. 3

C. 30

D. 25

2493. The minimum number of theoretical plates is required for achieving a given separation in distillation column with_________________?
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A. No reflux

B. Minimum reflux ratio

C. Zero reflux ratio

D. Total reflux

2494. Which of the following is a vacuum filter ?
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A. Batch basket centrifuge

B. Tank filter (Nutsche filter)

C. Rotary disc filter

D. Filter press

2495. In screen analysis, the notation +5 mm/-10 mm means particles passing through ____________________?
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A. 10 mm screen and retained on 5 mm screen

B. 5 mm screen and retained on 10 mm screen

C. Both 5 mm and 10 mm screens

D. Neither 5 mm nor 10 mm screen

2496. During agitation of liquids, the_________________?
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A. Froude number is independent for the curves between power number and Reynolds number in

B. fled system

C. All A., B. and C.

D. Power number becomes independent of impellers Reynolds number at high Reynolds number,

E. er number

F. Froude number is used to account for the effect of surface (e.g., the centre vortex) on the

2497. At low Reynolds 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 = ?/?N3 D5: Power number Re = ? N D2/?: Reynolds number N is the impeller rotational speed, and D is the impeller diameter ?
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A. Po ? Re0.5

B. Po ? Re1.0

C. Po ? Re0.0

D. Po ? Re-1.0

2498. Crushing of mineral particles is accomplished in a cage mill, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?
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A. Roll

B. Vibratory

C. Impact

D. None of these

2499. Energy consumption in a crusher decreases with increase in the________________________?
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A. Size of feed (at constant reduction ratio)

B. Size of the product (at constant feed size)

C. All A., B. & C.

D. Capacity of the crushing machine

2500. Which of the following terminology is not used for size reduction of materials to fine sizes or powders ?
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A. Pulverisation

B. Comminution

C. Compression

D. Dispersion

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