Process Equipment And Plant Design - Practice Test

[#116] Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.

(A) Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution

(B) Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids

(C) The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty

(D) In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes

Correct Answer

(C) The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty

[#117] 25% cut segmental baffle means that the baffle

(A) Height is 75% of the I.D. of the shell

(B) Height is 25% of the I.D. of the shell

(C) Spacing is 75% of its height

(D) Width is 25% of its height

Correct Answer

(A) Height is 75% of the I.D. of the shell

[#118] Vertical vessels are not supported by

(A) Brackets

(B) Skirts

(C) Columns

(D) Saddles

Correct Answer

(D) Saddles

[#119] Weep holes provided in the plates of a distillation column

(A) Facilitate draining out liquid from a tray when the unit is not in operation

(B) Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid

(C) Must be large enough (usually $${frac{1}{4}^{''}}$$ to $${frac{5}{8}^{''}}$$ dia) to prevent plugging but should not deliver excessive amount of fluid during operation

(D) All of the above

Correct Answer

(D) All of the above

[#120] Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

(A) Sensible heat differences are small, because the temperature changes from tray to tray is small

(B) Trouton's rule is applicable

(C) Liquid/vapor loading across the column remains constant

(D) All of the above

Correct Answer

(D) All of the above

Process Equipment And Plant Design - Study Mode

[#116] Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.

Correct Answer

[#117] 25% cut segmental baffle means that the baffle

Correct Answer

[#118] Vertical vessels are not supported by

Correct Answer

[#119] Weep holes provided in the plates of a distillation column

Correct Answer

[#120] Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Correct Answer