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In a tray-type fractionation tower, if the rising vapour blows the liquid from the tray in a fine spray (leaving the tray essentially dry), the condition is known as:

A - Up-flow B - Dropping C - Blowing D - Flooding Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 8:

Bubble cap trays:

A - Cannot handle a wide range of feed rates B - Can handle a wide range of feed rates C - Are difficult to install D - Can only be used with clean liquids Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 9:

Identify the following type of packing used in the illustration below:

A - Structure packing B - Random packing C - Support plate D - Saddle packing Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 10:

Identify the following type of packing used in the illustration below:

A - Random packing B - Structure packing C - Saddle packing D - Support plate Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct

Question 1:

In a tower where the purity of the top product is 93% and bottom 97%, both temperatures are high and reducing the heat to the reboiler has not helped, the corrective action to take would be to:

A - Raise the feed tray B - Reduce the reflux C - Add reflux and heat D - Lower the feed tray Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 2:

Your fractionator is producing top product, propane, that is 93% pure and bottom product, butane, which is 92% pure. You should be producing propane at 95% and butane at 97%. You have checked all controls and instruments and cannot detect any problems. Adjusting the reflux rate and reboiler temperatures do not seem to fix the problem. What is the cause of the problem and what remedial action can you take?

A - Cause is a malfunctioning reboiler. Remedy: take the reboiler off-line and repair B - Cause is water trapped in the trays. Remedy: take the fractionator off-line and drain the tower C - Cause is clogged valves in the trays. Remedy: take the fractionator off-line and clean the tray valves D - Cause is water trapped in the tray. Remedy: increase the top temperature of fractionator. Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 3:

When there is less bottom product in the top product and the top temperature goes down, the effect on product quality is that the:

A - Top product is more pure B - Bottom product is less pure C - Top product is less pure D - Quality is not affected Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 4:

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