chemical engineering process equipment and plant design MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering process equipment and plant design Mcqs
21. Baffle spacing is generally _________________ the I.D. of the shell ?
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A. More than

B. Not greater than

C. Not less than one fifth of

D. Both B. and C.
22. Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is_______________?
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A. Less

B. About 0.33 times

C. Same

D. About 3 times
23. If D is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of__________________?
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A. None of these

B. D/5 or minimum 2? to D

C. D/5 or minimum 2? to 5D

D. D/2 or minimum 2? to 5D

24. ___________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids?
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A. None of these

B. Bubble cap plate

C. Packed

D. Sieve plate

25. The dust collection efficiency of a cyclone separator_________________?
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A. None of these

B. Decreases with increase in gas flow rate

C. Is inversely proportional to the mass of the dust particle

D. Is directly proportional to the radius of the dust particle path

26. Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?
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A. 28

B. 19

C. 16

D. 38

27. Bubble cap tray is the most commonly used tray in large distillation column, because______________?
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A. It incurs less pressure drop as compared to any other try designed for the same duty

B. It eliminates the foaming and entrainment tendency during operation

C. None of these

D. Of its flexibility and nearly constant efficiency under varying conditions of operation
28. 1.2 to 3.8 cms is the value of the ______________________?
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A. All A., B. and C.

B. Skirt clearance for bubble caps

C. Downcomer liquid seal in case of a balanced tray design

D. Static submergence in case of a bubble cap tray for column operating under pressure (? 1 atm)

29. Low pressure steam (with saturation temperature between 105 to 120C) is usually used in the vacuum evaporators, which normally employ a vacuum of about _______________ mm Hg (referred to a 760 mm mercury barometer)?
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A. 450

B. 750

C. 250

D. 650
30. Pick out the wrong statement?
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A. The discharge end of the downcomer must project far enough into the tray liquid so that no

B. If sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in

C. None of these

D. The liquid head in the downcomer should not be greater than one half the plate spacing to

E. downcomer, it may entrain some vapour

F. id flooding

31. For identical operating conditions, the pressure drop over _______________ tray is the highest out of the following?
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A. Valve

B. Sieve

C. Counter flow

D. Bubble cap
32. The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?
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A. 2 ft irrespective of (for column > 3 ft diameter)

B. Twice

C. Equal to

D. 0.6-0.8 times
33. For a 25 mm hole drilled in plates to be riveted, the shank diameter of the rivet should be _______________ mm?
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A. 23

B. 25

C. 26

D. 27

34. In a shell and tube heat exchanger, the clearance of the tube is generally___________________?
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A. Not less than one-fourth of the tube diameter or 3/16?

B. More than the tube diameter

C. Equal to the tube diameter

D. More in case of triangular pitch as compared to the square pitch tube layout

35. (Le/D) for a Tee (used as elbow, entering run) would be around _______________________?
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A. 5

B. 160

C. 60

D. 200

36. Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?
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A. Flat plate extending across the wall

B. Segmental baffle

C. Disk type baffle

D. Helical type baffle

37. Cylindrical shell thickness of rotary drier is generally _______________ mm?
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A. 15-Dec

B. 6-8

C. 3-Feb

D. 18-22

38. In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?
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A. (P2 rd2/4)/rd

B. 4P2/?d

C. ?d/4P2

D. 4(P2 ?d2/4)/?d
39. Which of the following is the best tube material from thermal conductivity point of view alone ?
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A. Copper

B. Carbon steel

C. Aluminium

D. Stainless steel

40. Pick out the wrong statement pertaining to shell and tube heat exchanger_______________?
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A. Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum

B. Clearance between shell & baffles and between tube & baffles should be minimum to avoid

C. Baffles are supported independently of the tubes by tie rods and positioned by spacers

D. Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

E. ber of tie rods is 4 with at least 10 mm diameter

F. passing of the fluid, but it should be enough to permit the removal of tube bundle