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
☆

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 reflux flow and monitor the ratio level 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 heating fluid flow and monitor the reboiler temperature Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Question 1:

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

Question 4:

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

Question 5:

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

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

Question 6:

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

Question 7:

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

Question 8:

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

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

Question 9:

The plant fractionator is producing top product that is 95% 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 reflux. Remedy: Increase the reflux flow C - Cause is: Not enough heat. Remedy: Add heat to the reboiler 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: C Correct Answer(s): C Marked as: Correct _______________________________________________

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]