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If a fractionator is producing off specification product, all of the following actions can be taken to rectify the problem except:

A - Adjust the fluid flow from the reboiler B - Adjust the reflux rate C - Adjust the heat input to the reboiler D - Change the feed location to another tray Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 5:

Your fractionator is producing top product that is 93% pure and bottom product that is 97% pure. You have checked all controls and instruments and cannot detect any problems. What is the cause of the problem and what remedial action can you take?

A - Cause is too much heat. Remedy: reduce heat to reboiler B - Cause is not enough reflux. Remedy: increase reflux flow C - Cause is too much reflux. Remedy: decrease reflux flow D - Cause is not enough heat. Remedy: increase heat to reboiler Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 6:

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

Question 7:

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

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

Question 8:

After it has been verified that feed for the tower is available and all equipment has been checked out, the pressure controller should be set at about:

A - 75% of the normal operating pressure of the tower B - 80% of the normal operating pressure of the tower C - 85% of the normal operating pressure of the tower D - 70% of the normal operating pressure of the tower Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 9:

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

Question 10:

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

Question 1:

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

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

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