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Question 2:

The plant fractionator is producing top product that is 93% pure and bottom product that is 95% pure. All the controls and instruments have been checked and there are no problems. What is the cause of the problem and what remedial action should be taken?

A - Cause is: Not enough recycle. Remedy: Increase reflux flow and add heat to the reboiler. B - Cause is: Not enough heat. Remedy: Add heat to the reboiler C - Cause is: Not enough reflux. Remedy: Increase the reflux flow D - Cause is: Too much reflux. Remedy: Increase the reflux flow Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 3:

When the bottom product contains too much top product, the bottom temperature will drop because the:

A - Bottom product is purer B - Top product has a lower boiling temperature C - Top product is less pure D - Top product has a higher boiling temperature Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 4:

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

Question 5:

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

Question 6:

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

Question 7:

To produce products that meet required specifications, all of the following variables must be controlled except the:

A - Feed temperature B - Reflux rate C - Overhead temperature D - Fractionator pressure Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 8:

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

A - Bottom product is less pure B - Top product is less pure C - Quality is unaffected D - None of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 9:

The plant fractionator is producing top product that is 93% pure and bottom product that is 93% pure. All the controls and instruments have been checked and there are no problems. What is the cause of the problem and what remedial action should be taken?

A - Cause is: Not enough recycle. Remedy: Increase the reflux flow and add heat to the reboiler B - Cause is: Too much reflux. Remedy: Increase the reflux flow C - Cause is: Not enough heat. Remedy: Add heat to the reboiler D - Cause is: Not enough reflux. Remedy: Increase the reflux flow Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

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