chemical engineering MCQs – Page 131

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 Review each marked answer and report any item that may be outdated or unclear.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
2601. During size reduction by a jaw crusher, the energy consumed decreases with the__________________?
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A. Decreasing machine capacity

B. None of these

C. Increasing size of feed at constant reduction ratio

D. Decreasing size of product at constant size of feed

2602. Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a _____________ operation?
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A. Classification

B. Flocculation

C. Sedimentation

D. Clarification

2603. Which of the following screens has the maximum capacity ?
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A. Vibrating screen

B. Grizzlies

C. Shaking screen

D. Trommels

2604. Colloidal mills are used for ______________ grinding?
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A. Intermediate

B. Fine

C. Coarse

D. Ultrafine
2605. Variables affecting the rate of homogeneous reactions are___________________?
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A. Pressure and temperature only

B. Temperature and composition only

C. Pressure and composition only

D. Pressure, temperature and composition
2606. Dust laden air can be purified using a____________________?
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A. Bag filter

B. Gravity settler

C. Tubular centrifuge

D. Cyclone separator
2607. Which of the following minerals is not subjected to magnetic separation method ?
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A. Chromite

B. Rutile

C. Galena

D. Siderite

2608. ______________ is used for producing a thick suspension from a thin slurry?
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A. Rotary drum vacuum filter

B. Plate and frame filter press

C. Pressure filter thickener

D. Cartridge filter

2609. Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher ?
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A. Gyratory crusher

B. Fluid energy mill

C. Ball mill

D. Rod mill

2610. A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is_____________?
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A. 0.1

B. 0.4

C. None of these

D. 0.6
2611. Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________?
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A. Ball mill

B. Jaw crusher

C. Tube mill

D. Jet pulveriser

2612. Close circuit grinding by a ball mill with air sweeping employs a _______________________?
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A. Classifier

B. Cyclone separator between mill & classifier

C. Both A. & B.

D. Neither A. nor B.

2613. In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is___________________?
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A. Same

B. More

C. Less

D. Either A. or B., depends on other factors

2614. The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the__________________?
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A. Venturi atomiser

B. Gravity settling chamber

C. Electro-static precipitator

D. Cyclone separator

2615. ________________ resistance is not involved in the combustion of a carbon particle?
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A. Gas film

B. None of these

C. Ash

D. Chemical reaction

2616. Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their_________________?
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A. None of these

B. Densities

C. Particle sizes

D. Terminal velocities
2617. Velocity of a small particle of diameter Dp at a distance r from the rotational axis of a cyclone rotating at an angular speed ? is given by (the other symbols are as per standard notation) ?
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A. [(DP2/18). (?s ?/?)] ?2r

B. [(DP2/18). (?s ?/?)] ?2r

C. [(DP/18). (?s ?/?)] ?2r2

D. [(DP/18). (?s ?/?)] ?2r

2618. Which of the following mechanical conveyors does not come under the division scrapers? ?
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A. Drag conveyor

B. Ribbon conveyor

C. Bucket elevators

D. Flight conveyor

2619. Screen efficiency is______________________?
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A. Recovery

B. Recovery/rejection

C. None of these

D. Rejection

2620. Cyclones are used primarily for separating_________________?
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A. Solids from solids

B. Solids

C. Solids from fluids

D. Liquids