chemical engineering process equipment and plant design MCQs – Page 3

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 Review each marked answer and report any item that may be outdated or unclear.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
41. The longitudinal stress induced in a thin walled cylindrical vessel under internal pressure is_________________?
comments icon0

A. pd/2t

B. pd/t

C. pd/4t

D. pd/8t

42. Pick out the wrong statement pertaining to the design of a horizontal tube evaporator ?
comments icon0

A. Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator

B. Liquor flows inside the tube, while the steam is outside submerging the tube

C. It is suitable for process, in which the final product is a liquor instead of solid

D. ght = 2.5-4 metres

E. It is unsuitable for concentrating those liquids, which form a scale or deposit salt

43. ______________ closure is the weakest enclosure for cylindrical vessels?
comments icon0

A. Elliptical

B. Hemispherical

C. Torispherical

D. Conical or flat plate
44. Removable connection of tubes to tube sheet is called___________________?
comments icon0

A. Socket

B. Saddle

C. Ferrule

D. Nipple

45. In a distillation column, bubble caps are located on trays with a pitch of ______________ times the outside diameter of the caps?
comments icon0

A. 2.5

B. 1.6 to 2

C. 1.5 to 3

D. 1.3 to 2
46. Wind load consideration in the design of a support can be neglected, when the vessel is___________________?
comments icon0

A. Tall but empty

B. Tall (say 30 metres), but is full of liquid

C. Short (< 2 m) and housed indoor

D. None of these

47. The necessary wall thickness for a metallic storage vessel is a function of the ___________________?
comments icon0

A. Diameter of the vessel

B. All A., B. and C.

C. Ultimate tensile strength (or yield point) of the material and operating temperature

D. Operating pressure and welding/joint efficiency

48. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?
comments icon0

A. Less than that for fluid flow

B. Same as that for fluid flow

C. More than that for fluid flow

D. D2 D1 (D1 and D2 are I.D. of inner and outer pipes respectively)

49. In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed ______________ of the column diameter?
comments icon0

A. 1/5th

B. 1/50th

C. 1/30th

D. 1/15th
50. At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally ?
comments icon0
A. Lower

B. Higher

C. Unpredictable

D. Same

51. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid ?
comments icon0

A. 0

B. ?

C. < 1

D. > 1

52. Value of Peclet number = ?, is the representative of___________________?
comments icon0

A. Complete back mixing

B. Plug flow

C. Eddy diffusivity = 0

D. Laminar flow

53. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?
comments icon0
A. Either A. or B., whichever is larger

B. 6% of I.D.

C. Either A. or B., whichever is smaller

D. 3 times the thickness

54. For turbulent flow (NRe > 2100) of low viscosity fluid (? > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ? = fluid density, lb/ft3 ? = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?
comments icon0

A. Di, opt = 4.7 Q0.36. ?3.2?0.13

B. Di, opt = 3.9 Q0.45. ?0.95

C. Di, opt = 3.9 Q0.45 ?0.13

D. Di, opt = 3 Q0.36. ?0.88

55. In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around __________________?
comments icon0

A. 0.5

B. 1.5

C. 2.5

D. 3.5

56. A/an _______________ is used for changing the direction of a pipeline?
comments icon0

A. Union

B. Flange

C. Disc compensator

D. Elbow
57. In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?
comments icon0
A. Liquid gradient on the tray

B. Small downcomer liquid seal

C. Lower skirt clearance

D. Lower static submergence

58. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor?
comments icon0
A. 15-20

B. 30-35

C. 35-40

D. 10-May

59. Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always_________________?
comments icon0
A. Less than arithmetic mean value

B. More than arithmetic mean value

C. More than geometric mean value

D. Both B. & C.

60. Stage efficiency for packed tower varies with the____________________?
comments icon0
A. All A., B. and C.

B. Type & size of packing

C. Operating pressure and column diameter

D. Fluid rates and fluid properties