Chemical Engineering - Process Equipment and Plant Design

1. 

Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.

A. conical
B. flat
C. floating
D. fixed

Answer: Option C

Explanation:

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2. 

Larger depth of liquid on the trays of a distillation column

A. leads to high tray efficiency.
B. results in higher pressure drop per tray.
C. both (a) & (b).
D. neither (a) or (b).

Answer: Option C

Explanation:

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3. 

Pick out the wrong statement.

A. Plate efficiency increases with increase in superficial vapour velocity till entrainment limit.
B. Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1".
C. Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value.
D. none of these.

Answer: Option D

Explanation:

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4. 

Pick out the wrong statement.

A. In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used.
B. Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing.
C. In a seive tray, the minimum hole diameter is equal to the tray thickness.
D. In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness.

Answer: Option D

Explanation:

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5. 

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

Answer: Option B

Explanation:

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