In a tray-type fractionation tower, flooding takes place when the downcomers cannot:
A - Retain the liquid in the trays B - Carry away the liquid from the trays C - Provide a source for tower feed D - Provide intimate contact with the ascending vapours Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________
Question 9:
The fractionator tray used for liquid draw-off is referred to as the:
A - Reflux tray B - Stripping tray C - Chimney tray D - Feed tray Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________
Question 10:
Identify the following type of packing used in the illustration below:
A - Random packing B - Saddle packing C - Support plate D - Structure packing Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct
Question 1:
Bubble cap trays can be used:
A - With a narrow range of feed rates B - When uniform contact between liquid and vapour is desired C - With small volumes of liquids and vapours D - Only with clean liquids Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________
Question 2:
Bubble caps provide intimate contact between the ____________ liquid and the__________ vapour.
A - descending, descending B - ascending, ascending C - descending, ascending D - ascending, descending Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________
Question 3:
Identify the following type of packing used in the illustration below:
A - Structure packing B - Saddle packing C - Random packing D - Support plate Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________
Question 4:
In a tray-type fractionation tower, the stripping trays are:
A - Where overhead fractions are removed from the bottom product B - The highest trays in the tower C - Below the reflux tray, where the overhead product is enriched D - Used for liquid draw-off Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________
Question 5:
Packing is used for the separation of two or more liquids and is mainly used in:
A - Dehydration units B - Reboiler units C - Distillation units D - Valve trays Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________
Question 6:
Structured packing, which is fabricated from a woven metal or plastic gauze, is used where it is important to maintain:
A - Low pressure drops and where liquid rates are low B - High temperature rates and reflux purity C - Low pressure drops and where liquid rates are high D - High pressure drops and where liquid rates are low Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________
Question 7:
Identify the object in the illustration below:
A - Structure packing B - Saddle packing C - Random packing D - Support plate Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________
Question 8:
Identify the following type of packing used in the illustration below:
A - Structure packing B - Support plate C - Random packing D - Saddle packing Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________
Question 9:
The type of packing and material used are not determined by the:
A - Cost B - Allowable pressure drop across the fractionator C - Products being fractionated D - Valve tray size Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________
Question 10:
You have been tasked with designing the fractionator trays for a new installation. You have been given a number of parameters but one variable is still unknown. The flow rate through the tower could be consistent or it may vary between heavy and light flows. The best types of valves to place in the tray to deal with this issue would be:
A - Heavy valves B - Light valves C - No valves D - Heavy valves and Light valves Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct
Question 1:
Bubble cap trays:
A - Can only be used with clean liquids B - Cannot handle a wide range of feed rates C - Can handle a wide range of feed rates D - Are difficult to install Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________
Question 2:
In a tray-type fractionation tower, the action in the trays:
A - Strips the liquids from the descending vapour to produce an acceptable bottom product B - Dehydrates the liquids in the descending vapour to produce an acceptable bottom product C - Condenses the liquids from the ascending vapour to produce an acceptable overhead product D - None of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): C Marked as: Incorrect _______________________________________________
Question 3:
Identify the following type of packing used in the illustration below:
A - Support plate B - Random packing C - Structure packing D - Saddle packing Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________
Question 4:
Packing is used for the separation of two or more liquids and is mainly used in:
A - Valve trays B - Distillation units C - Reboiler units D - Dehydration units Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________
Question 5:
The number of trays in a fractionators depends on:
A - The velocity of the rising vapours B - The viscosity of the products C - The mechanical design of the trays D - The relative vapour pressures of the products Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________
Question 6:
Identify the following type of packing used in the illustration below:
A - Structure packing B - Support plate C - Saddle packing D - Random packing Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________
Question 7:
In a tray-type fractionation tower, the stripping trays are:
A - Used for liquid draw-off B - Where overhead fractions are removed from the bottom product C - Below the reflux tray, where the overhead product is enriched D - The highest trays in the tower Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________
Question 8:
Bubble cap trays cannot handle large volumes of liquids and vapours.
A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________
Question 9: