chemical engineering MCQs – Page 117

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 Review each marked answer and report any item that may be outdated or unclear.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
2321. Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, ? = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?
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A. 1/?

B. ??

C. 1/??

D. 1/?2

2322. _______________ centrifuge is the most suitable for separation of non-friable crystals?
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A. Disc-bowl

B. Suspended batch basket

C. Perforated horizontal basket continuous

D. Tubular bowl

2323. Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?
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A. Viscosity with concentration

B. Degree of ideality of the solution

C. Both A. and B.

D. Neither A. nor B.

2324. For efficient grinding, ball mills must be operated__________________?
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A. At a speed less than the critical speed

B. At a speed more than the critical speed

C. With minimum possible small balls

D. At a speed equal to the critical speed

2325. Vacuum filter is most suitable for the_______________?
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A. Removal of fines from liquid

B. Liquids of very high viscosity

C. Liquids having high vapour pressure

D. None of these
2326. Specific surface area is the surface area of a unit _______________ of materials?
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A. Volume

B. Either A. or B.

C. Weight

D. Neither A. nor B.

2327. Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________?
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A. Sorting

B. Elutriation

C. Sizing

D. Flocculation

2328. Overall efficiency of the distillation column is _____________________?
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A. The ratio of number of ideal plates to actual plates

B. The ratio of number of actual plates to ideal plates

C. Same as the Murphree efficiency

D. Always more than the point efficiency

2329. Which of the following mechanical conveyors does not come under the division carriers? ?
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A. Apron conveyor

B. Bucket elevator

C. Belt conveyor

D. Screw conveyor
2330. CO2 can be absorbed by____________________?
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A. Hot cupric oxide

B. Alumina

C. Cold Ca(OH)2

D. Heated charcoal
2331. With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge________________?
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A. Increases

B. Decreases

C. Remains constant

D. Increases linearly

2332. The most suitable equipment for the transportation of 200 mesh size particles is a _______________?
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A. Pneumatic conveyor

B. Bucket elevator

C. Belt conveyor

D. Screw conveyor

2333. The critical speed of a trommel (N) is related to its dia D. as _____________________?
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A. N ? 1/?D

B. N ? D

C. N ? ?D

D. N ? 1/D

2334. The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?
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A. Plate & frame

B. Sand

C. Rotary

D. Vacuum

2335. As particle size is reduced__________________?
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A. Screening becomes progressively easier

B. Screening becomes progressively more difficult

C. None of these

D. Capacity and effectiveness of the screen is increased

2336. In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?
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A. Ultrafine

B. Fine

C. Secondary

D. Primary
2337. Ball mill is used for__________________?
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A. Fine grinding

B. Coarse grinding

C. Attrition

D. Crushing

2338. The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be_________________?
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A. 3.34 Wi

B. 1.34 Wi

C. Wi

D. 0.5 Wi

2339. In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the__________________?
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A. Filtration time only

B. Square root of the velocity

C. Square of the viscosity

D. Washing time only

2340. Percentage saturation is _______________ the relative saturation?
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A. Always greater than

B. None of these

C. Not related to

D. Always smaller than