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 the fractionation tower, the top temperature is:

A - The highest temperature in the tower B - Controlled to maintain the quality of the bottom product C - The lowest temperature in the tower D - None of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 6:

The feed stream to the fractionation tower should be:

A - Completely vaporized B - Partly vaporized C - Totally liquid D - None of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 7:

Feed is defined as:

A - The condensed product that is returned to the still to assist in making a more complete separation into the desired fractions B - The original feed mixture with the distillate removed C - The stream of hydrocarbons that enters the fractionation tower D - The lighter hydrocarbon component(s) distilled from the feed Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 8:

The bottom temperature of a fractionation tower:

A - Should be the highest temperature in the tower and is limited by the amount of heating that can be accomplished by the reflux B - Should be maintained at the lowest point that produces a bottom product of acceptable quality C - Should be maintained just high enough to completely vaporize the overhead product D - Should be maintained at the highest point that produces a bottom product of acceptable quality Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 9:

One difference between fractional distillation and simple distillation is that fractional distillation requires additional:

A - Condensers B - Heat C - Stills D - Receivers Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 10:

The fractionator reflux flow rate is determined by:

A - Reflux ratio X liquid product flow rate B - Reflux product flow rate X relative temperature C - Reflux ratio X overhead product flow rate D - Relative vapour pressure X reflux product flow rate Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct Question 1:

As the liquid in the fractionator becomes richer with the ________ higher boiling point components, it flows back into the still below where it is eventually withdrawn as the __________ product.

A - heavier, bottom B - heavier, top C - lighter, bottom D - lighter, top Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 2:

Top product is defined as:

A - The lighter hydrocarbon component(s) distilled from the feed B - The original feed mixture with the distillate removed C - The condensed product that is returned to the still to assist in making a more complete separation into the desired fractions D - The stream of hydrocarbons that enters the fractionation tower Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 3:

When the fractionation tower pressure is changed, the top and bottom temperatures must also be changed. If the pressure is__________, both temperatures must be ___________ to maintain the quality of the overhead and bottom products.

A - increased, increased B - increased, decreased C - increased, kept static D - decreased, increased Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 4:

The top temperature of a fractionator is the temperature of the vapour above the top tray.

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

Question 5:

Why is a simple distillation process not appropriate for the separation of various hydrocarbons contained in a Liquefied Petroleum Gas stream?

A - Because the LPG is already a gas and cannot be treated by distillation B - Because all components of the stream have the same boiling point C - Because components with lower boiling points and higher vapour pressures are the last to distill D - Because each component of the stream has its own boiling point and vapour pressure Correct Answer(s): D Marked as: Incorrect _______________________________________________

Question 6:

In the fractionation tower, the top temperature is:

A - The highest temperature in the tower B - Controlled to maintain the quality of the bottom product C - The lowest temperature in the tower D - None of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 7:

In a distillation process, the Initial Boiling Point (IBP) is defined as the temperature of the liquid when:

A - The first drop of distillate condenses into the receiver B - The first evidence of steam can be observed C - The last drop of liquid boils and distils into the receiver D - Partial vaporization of the desired component is achieved Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 8:

Feed is defined as:

A - The lighter hydrocarbon component(s) distilled from the feed B - The condensed product that is returned to the still to assist in making a more complete separation into the desired fractions C - The original feed mixture with the distillate removed D - The stream of hydrocarbons that enters the fractionation tower Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 9:

Bottom product is defined as:

A - The condensed product that is returned to the still as reflux B - The stream of hydrocarbons that enters the fractionation tower C - The lighter hydrocarbon component(s) distilled from the feed D - The original feed mixture with the distillate removed Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 10:

One difference between fractional distillation and simple distillation is that fractional distillation requires additional:

A - Stills B - Receivers C - Heat D - Condensers Correct Answer(s): A

Question 1:

The fractionator reflux flow rate is determined by:

A - Relative vapour pressure X reflux product flow rate B - Reflux ratio X overhead product flow rate C - Reflux ratio X liquid product flow rate D - Reflux product flow rate X relative temperature Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 2:

Why is it impossible to produce a 100% pure product using fractional distillation?

A - Because the process uses heat repeatedly on each tray, diminishing the purity of the overhead product B - Because each time the vapours rise in the tower, the purity is decreased through condensation C - The more trays the fractionator contains, the lower the purity of the overhead product D - Because the vaporization and condensing actions on the trays are not 100% effective. Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 3:

The fractionation process is a distillation, or physical separation, in which fluids in a mixture are fractionated by the difference in their:

A - Atomic weights B - Boiling points C - Set points D - Dew points Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 4:

Feed is defined as:

A - The stream of hydrocarbons that enters the fractionation tower B - The original feed mixture with the distillate removed C - The condensed product that is returned to the still to assist in making a more complete separation into the desired fractions D - The lighter hydrocarbon component(s) distilled from the feed Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 5:

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]