Process Equipment And Plant Design - Study Mode

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[#181] In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.

(A) 2.5

(B) 5

(C) 12.5

(D) 17.5

Correct Answer

(B) 5

[#182] In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?

(A) Long tube vertical evaporator

(B) Short tube vertical evaporator

(C) Horizontal tube evaporator

(D) None of these

Correct Answer

(C) Horizontal tube evaporator

[#183] Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

(A) 5

(B) 20

(C) 35

(D) 55

Correct Answer

(B) 20

[#184] The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is

(A) 0.25

(B) 0.50

(C) 0.75

(D) 1.25

Correct Answer

(A) 0.25

[#185] Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as

(A) 0.01

(B) 0.3

(C) 0.75

(D) 0.95

Correct Answer

(B) 0.3