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Question 3:

The plant fractionator is producing top product that is 97% 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: Too much reflux. Remedy: Reduce the reflux flow 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: Not enough recycle. Remedy: Increase the reflux flow and add heat to the reboiler Correct Answer(s): A Marked as: Incorrect _______________________________________________

Question 4:

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

Question 6:

In a water-cooled overhead condenser, high pressure drop on the water side indicates:

A - Slugging or surging in the feed tank B - A reflux ratio controller malfunction C - Fouling of the tubes D - Cycling of the heating fluid in the reboiler Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 7:

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

Question 8:

It is important to check the overhead product temperature to ensure that the tower is working efficiently.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 9:

After the feed to the tower has been started, the flow of heating fluid to the reboiler should only be started when:

A - The normal operating pressure of the tower has been achieved B - The liquid covers the reboiler tubes C - The overhead condenser is free of cooling fluids D - There is sufficient level in the reflux accumulator Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 10:

Imagine that you are starting up a fractionator. You have allowed liquid to enter the reboiler and cover the tubes. What is the next thing you must do and what must be monitored while you are doing it?

A - Start the heating fluid flow and monitor the reboiler temperature B - Start the feed to the tower and monitor the reboiler temperature C - Allow the reboiler liquid level to reach operating level and monitor condenser pressure D - Start the reflux flow and monitor the ratio level Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A

Question 1:

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

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

Question 2:

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

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

Question 3:

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

A - Top product is less pure B - Top product has a higher boiling temperature C - Bottom product has a higher boiling temperature D - Bottom product is purer Correct Answer(s): C Marked as: Incorrect _______________________________________________

Question 4:

It is important to check the overhead product temperature to ensure that the tower is working efficiently.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 5:

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

Question 6:

The symptoms of water in the tower are that both products are off specification, and no improvement can be made by changing the reflux rate or heat input to the reboiler.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 7:

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

Question 8:

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