chemical engineering mechanical operations MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mechanical operations Mcqs

21. Wheat is ground into flour in a___________________?
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A. Roller crusher

B. Fluid energy mill

C. Hammer crusher

D. Impact mill

22. ____________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials?
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A. Belt

B. Apron

C. Screw

D. Bucket

23. A propeller agitator_______________?
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A. All A., B. and C.

B. Produces mainly axial flow

C. Runs at very slow speed (2 rpm)

D. Is used for mixing high viscosity pastes

24. Which of the following is used for primary crushing of very hard lumpy materials ?
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A. Gyratory crusher

B. Tube mill

C. Toothed roll crusher

D. Ball mill

25. For efficient grinding, ball mills must be operated__________________?
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A. At a speed equal to the critical speed

B. With minimum possible small balls

C. At a speed less than the critical speed

D. At a speed more than the critical speed

26. Sulphuric acid mist is arrested by using a ____________ scrubber?
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A. Co-current

B. Venturi

C. Packed wet

D. Hollow wet

27. Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?
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A. < 10

B. < 100

C. > 10

D. > 100

28. For transporting pasty material, one will use a/an__________________?
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A. Bucket elevator

B. Screw conveyor

C. Apron conveyor

D. Belt conveyor

29. Which of the following is a continuous filter ?
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A. Cartridge filter

B. Shell and leaf filter

C. None of these

D. Plate and frame filter

30. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a__________________?
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A. Banbury mixer

B. Mixer-extruder

C. Muller mixer

D. Pug mill

31. The process by which fine solids is removed from liquids is termed as _____________________?
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A. Decantation

B. Sedimentation

C. Classification

D. Flocculation

32. Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?
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A. All A., B. and C.

B. Jet mills

C. Fluid energy mill

D. Micronizer

33. Which of the following oxides is not present in hematite iron ore ?
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A. Manganese oxide

B. Calcium oxide

C. Cobalt oxide

D. Titanium oxide

34. Critical speed of rotation, N (in rps rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?
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A. (1/?). ?(g/r)

B. ?(g/r)

C. (1/2?). ?(g/r)

D. 2?. ?(g/r)

35. Size reduction of moulding powders, waxes, resins & gums are done in a _______________ mill?
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A. Cage

B. Hammer

C. Both A. & B.

D. Neither A. nor B.

36. 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. er number

C. is dependent on the geometry of the impeller

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

E. fled system

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

37. General crushing equation is given by d(P/m) = -K (dD? S/D? n S). Bonds crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?
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A. 2

B. 1.5

C. 2.5

D. 1

38. Which of the following must be stored in silos and not in open yard ?
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A. None of these

B. Sand

C. Coke breeze

D. High V.M. bituminous coal

39. Soft & non-abrasive materials can be made into fines by________________________?
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A. Cutting

B. None of these

C. Attrition

D. Compression

40. Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
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A. Trough washer

B. Spiral separator

C. Froth floatation

D. Baum jig washer

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