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

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

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. $$\frac{{{{\text{p}}_{\text{h}}} - {{\text{d}}_{\text{h}}}}}{{{{\text{d}}_{\text{h}}}}}$$

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

A. Low gas velocity

B. High gas velocity

C. Excessive liquid gradient over the tray

D. Low reflux ratio

A. 1.1 to 1.5

B. 1.6 to 2

C. 2.2 to 2.6

D. 2.7 to 3

A. 1-1 cocurrent

B. Double pipe

C. All multipass

D. All of the above

A. It reduces heat transfer area

B. More thinner tubes can be used

C. Pressure drop is reduced

D. It makes condenser compact

A. Half

B. Twice

C. Thrice

D. Five times

A. 3-5

B. 5-11

C. 8-15

D. 12-18

A. (BTU/hr.ft².°F)^-1

B. (kcal/hr.m².°C)^-1

C. (W/m².°K)^-1

D. (kcal/hr.m.°C)^-1