Process Equipment And Plant Design MCQ Questions & Answers

1

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

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Answer & Solution

Answer: Option D

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2

A perforated plate has holes of diameter d_h arranged in a pitch p_h. Each hole has a tube of I.D. d_t passing through it. The ligament efficiency is given by

A) $$\frac{{{{\text{p}}_{\text{h}}} - {{\text{d}}_{\text{h}}}}}{{{{\text{p}}_{\text{h}}}}}$$ B) $$\frac{{{{\text{p}}_{\text{h}}} - \left( {\frac{{{{\text{d}}_{\text{h}}}\,{{\text{d}}_{\text{t}}}}}{2}} \right)}}{{{{\text{p}}_{\text{h}}}}}$$ C) $$\frac{{{{\text{p}}_{\text{h}}} - {{\text{d}}_{\text{t}}}}}{{{{\text{p}}_{\text{h}}}}}$$ D) $$\frac{{{{\text{p}}_{\text{h}}} - {{\text{d}}_{\text{h}}}}}{{{{\text{d}}_{\text{h}}}}}$$

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Answer & Solution

Answer: Option C

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3

An adequate clearance between the tray and the shell wall of a distillation column is provided to

A) Drain the liquid from the tray when the unit is not in operation B) Allow for thermal expansion and facilitate installation C) Avoid back-trapping D) None of these

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Answer & Solution

Answer: Option B

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4

Back-trapping in a distillation column results due to

A) Low gas velocity B) High gas velocity C) Excessive liquid gradient over the tray D) Low reflux ratio

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Answer & Solution

Answer: Option C

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5

In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

A) 1.1 to 1.5 B) 1.6 to 2 C) 2.2 to 2.6 D) 2.7 to 3

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Answer & Solution

Answer: Option A

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6

The LMTD correction factor (F_T) is applied in __________ heat exchangers.

A) 1-1 cocurrent B) Double pipe C) All multipass D) All of the above

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Answer & Solution

Answer: Option C

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7

In condenser, the cooling water is passed in the tube side in a pass arrangement, because

A) It reduces heat transfer area B) More thinner tubes can be used C) Pressure drop is reduced D) It makes condenser compact

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Answer & Solution

Answer: Option A

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8

For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.

A) Half B) Twice C) Thrice D) Five times

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Answer & Solution

Answer: Option C

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9

In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

A) 3-5 B) 5-11 C) 8-15 D) 12-18

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Answer & Solution

Answer: Option B

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10

Cooling water fouling factors vary in the range of 0.001 to 0.003

A) (BTU/hr.ft².°F)^-1 B) (kcal/hr.m².°C)^-1 C) (W/m².°K)^-1 D) (kcal/hr.m.°C)^-1

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Answer & Solution

Answer: Option A

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Process Equipment And Plant Design MCQ Questions & Answers | Chemical Engineering