Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
offer8.docx
Скачиваний:
3
Добавлен:
01.07.2025
Размер:
1 Мб
Скачать
☆

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 - Cycling of the heating fluid in the reboiler D - Fouling of the tubes Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 9:

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

Question 10:

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: Too much reflux. Remedy: Increase the reflux flow C - Cause is: Not enough reflux. Remedy: Increase the reflux flow 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 1:

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

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

Question 2:

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 3:

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 4:

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 - 80% of the normal operating pressure of the tower B - 75% 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: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 5:

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

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

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

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

Question 8:

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

Question 9:

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

A - True B - False Correct Answer(s): A Marked as: Incorrect _______________________________________________

Question 10:

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: Too much reflux. Remedy: Increase 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 Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Question 1:

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

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

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]