chemical engineering MCQs – Page 133

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 Review each marked answer and report any item that may be outdated or unclear.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
2641. Which of the following is not a non-metalliferous mineral ?
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A. Quartz

B. Fluorspar

C. Calcite

D. Cassiterite
2642. The mechanism of size reduction by a hammer mill is by impact and attrition between the________________?
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A. Grinding element & the housing

B. Feed particles

C. Both A. and B.

D. Neither A. nor B.

2643. Jigging is a technique by which different particles can be____________________?
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A. Separated by particle density

B. Separated by particle size

C. Separated by particle shape

D. Mixed

2644. Coal is finally pulverised to 200 mesh size for burning in boilers by a___________________?
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A. Ball mill

B. Roll crusher

C. Hammer crusher

D. Gyratory crusher

2645. In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?
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A. Less than

B. Data insufficient; cant be predicted

C. Same as

D. More than

2646. Tabular bowl centrifuges as compared to disk bowl centrifuges___________________?
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A. Cant be used for separation of fine suspended solids from a liquid

B. Operate at higher speed

C. Employ bowl of larger diameter

D. Cant be operated under pressure/vacuum

2647. Which of the following is not used as a filter medium in case of corrosive liquids?
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A. Nylon

B. Glass cloth

C. Cotton fabric

D. Metal cloth of monel or stainless steel

2648. Diatomaceous earth is a/an_________________?
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A. Catalyst

B. Filter medium

C. Filter aid

D. Explosive

2649. The capacity of a pneumatic conveying system depends upon the ______________________?
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A. Bulk density of materials

B. All A., B. and C.

C. Pressure of the conveying air

D. Diameter of the conveying line

2650. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill.) ?
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A. 1/D2.5

B. D2.5

C. D

D. 1/D

2651. Tank filter (e.g., Nutsche filter) is___________________?
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A. A high pressure filter

B. A continuous filter

C. A leaf filter

D. Used for small scale filtration work
2652. Half the angle of nip, (?), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?
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A. cos ? = (dr + df)/(dr + dp)

B. tan ? = (dr + dp)/(dr + df)

C. cos ? = (dr + dp)/(dr + df)

D. sin ? = (dr + dp)/(dr + df)

2653. A _____________ mixer resembles a ball mill without balls?
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A. Tumbling

B. Pug mill

C. Banbury

D. Pan

2654. Fluid medium used in the classification technique of mineral beneficiation is_________________?
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A. Water

B. Either A. or B.

C. Air

D. Neither A. nor B.

2655. Trommels separate a mixture of particles depending on their_____________________?
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A. Size

B. Density

C. Wettability

D. Electrical & magnetic properties

2656. Horsepower required for a roll crusher is directly proportional to its__________________?
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A. Reduction ratio

B. Capacity

C. Both A. & B.

D. Neither A. nor B.

2657. Mass flow of granular solid (M) through a circular opening of dia, D follows_____________________?
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A. M ? ?D

B. M ? D

C. M ? D3

D. M ? D2

2658. For a non-spherical particle, the sphericity__________________?
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A. Is defined as the ratio of surface area of a sphere having the same volume as the particle to the

B. Is the ratio of volume of a sphere having the same surface area as the particle to the actual

C. ual surface area of the particle</strong>

D. ume of the particle

E. Has the dimension of length

F. Is always less than 1

2659. What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
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A. 16

B. 46

C. 32

D. 40

2660. Pine oil and Cresylic acid are used as ______________ in the froth floatation process?
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A. Frother

B. Depressor

C. Conditioner

D. Collector