chemical engineering process equipment and plant design MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.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

161. In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area) ?
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A. Sa = 1.5 Aa

B. Aa = Sa

C. Aa = 1.5 Sa

D. 1.2 Aa = 1.2 Sa

162. Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder _________________?
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A. Has greater structural strength

B. Is easy to fabricate

C. Both A. and B.

D. Neither A. nor B.

163. The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________?
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A. 1

B. Minimum

C. ?

D. 0

164. The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?
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A. 1.25 to 3.125

B. 3.5 to 7.0

C. 8 to12

D. 0.3 to 0.8

165. The wall thickness for a large high pressure pipeline is determined by the consideration of the____________________?
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A. Circumferential pipe-wall tension

B. Forces exerted by static and dynamic action at bends

C. Temperature stresses

D. Axial tensile stress in the pipe

166. ____________ is the determining factor for the number of bubble caps to be used per tray?
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A. Permissible slot velocity

B. Vapor load

C. Tray diameter

D. Liquid load

167. Vapor velocity in a distillation column for non-foaming mixture is in the range of ______________ times the flooding velocity?
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A. 0.85 to 0.95

B. 1.5 to 2

C. 0.1 to 0.3

D. 0.6 to 0.7

168. Safety valves are provided in chemical equipments to guard against excessive_________________?
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A. Turbulence

B. Pressure/pressure fluctuation

C. Noise

D. Temperature

169. In condenser, the cooling water is passed in the tube side in a pass arrangement, because________________?
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A. It makes condenser compact

B. More thinner tubes can be used

C. Pressure drop is reduced

D. It reduces heat transfer area

170. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?
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A. 20.8

B. None of these

C. 20.2

D. 2

171. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate ?
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A. Heat transfer rate is independent of tube arrangement

B. Square pitch

C. Diagonal square pitch

D. Triangular pitch

172. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer coefficient (hi) vanishes after a Reynold number of_____________?
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A. 1000

B. 3000

C. 5000

D. 10000

173. An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________?
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A. Allow for thermal expansion and facilitate installation

B. Avoid back-trapping

C. None of these

D. Drain the liquid from the tray when the unit is not in operation

174. Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower ?
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A. persed solids

B. igned for the same duty</strong>

C. ferred over packed towers as the packing may be crushed due to large temperature changes

D. The total weight of a dry plate tower is usually much more than that of a dry packed tower

E. In operations involving large temperature changes. (e.g. distillation), plate towers are

F. Plate tower is preferred over packed tower, if the operation involves liquids containing

175. The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about ______________ kms?
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A. 15

B. 1

C. 25

D. 5

176. Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to___________________?
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A. G0.5

B. G0.2

C. G1.5

D. G0.8

177. Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is_____________?
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A. More

B. Same

C. Less

D. Twice

178. Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ______________ roofs?
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A. Fixed

B. Conical

C. Floating

D. Flat

179. In case of 1.5? heat exchanger tubes, the inside flow area _____________ with decrease in BWG?
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A. Increases

B. None of these

C. Remains same

D. Decreases

180. ______________ of water makes it a widely used coolant in heat exchangers?
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A. Low dirt factor

B. High specific heat

C. Low viscosity

D. Low corrosiveness

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