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In a solid desiccant dehydration system that uses two or more towers:

A - One tower will be on the drying cycle at all times B - All towers will be on the adsorbing cycle at all times C - The towers will be on the adsorbing cycle one at a time D - All the towers will be on the drying cycle at all times Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 5:

During the operation of solid desiccant systems the presence of sulphide gases in the stream is bound to enhance the formation of carbonyl sulphide if:

A - Ferrous oxide based adsorbents are used B - Activated bauxite adsorbents are used C - Aluminum based adsorbents are used D - Silica based adsorbents are used Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 6:

When compared to a glycol dehydration system, a solid desiccant system:

A - Is adaptable to plants handling extremely wet gas B - Cannot handle gases at higher temperatures C - Is unadaptable to load changes D - Has a much lower initial investment Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 7:

The rate of adsorption:

A - Increases as temperature increases B - Increases as pressure increases C - Decreases as temperature increases D - Increases as pressure decreases Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 8:

In addition to dehydrating gas dry desiccants can be used to:

A - Remove heavier hydrocarbons from a gas stream B - Sweeten and remove water from liquid hydrocarbons C - Remove mercaptan sulphur from a gas stream D - All of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 9:

The depth of the desiccant bed from saturation to initial adsorption is known as the:

A - Mass-transfer zone B - Wet gas zone C - Adsorption zone D - Regeneration zone Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 10:

Dry solid desiccant replacement is necessary because of:

A - Powdering B - Breakage C - Poisoning D - All of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct

Question 1:

During the molecular sieve cool and fill cycle, when the treating direction is downflow, the entire vessel must be filled with liquid prior to switching in order to drive all gas from void spaces to ensure that:

A - The temperature of the regeneration gas is controlled B - No channelling occurs from two-phase flow C - Product contamination with the regeneration medium does not occur D - The adsorber repressurizes to the incoming product pressure Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 2:

The molecular sieve does not effectively remove which of the following compounds:

A - Water B - Mercaptans C - Carbonyl sulphide D - Methanol Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 3:

During the molecular sieve regeneration cycle, sweet fuel gas is circulated through the adsorber at moderate pressure. This gas is heated in the regeneration gas heater to temperatures ranging from:

A - 260 - 315°C B - 225 - 260°C C - 360 - 415°C D - 240 - 275°C Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 4:

To prevent the loss of molecular sieve during an upset condition, inlet and outlet nozzles should be covered with:

A - A fine screen B - Deflectors C - Baffle plates or equivalent distributors D - A coarse screen Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 5:

One advantage of a molecular sieve hydrocarbon treating system is that:

A - Molecular sieve degradation does not occur when corrosion inhibitors are present B - Removal of all polar compounds is achieved in a series of simple steps C - High temperature gas regeneration is required D - The regeneration process is simple Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 6:

The adsorption (treating) cycle of a typical propane and butane molecular sieve system is:

A - 15 - 30 minutes B - 1 hour C - 2 hours D - 8 hours Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 7:

During the molecular sieve treating cycle, the feed pressure must be high enough to:

A - Maintain the flow in the liquid phase B - Maintain the flow in the gas phase C - Regenerate the bed D - Allow sweet, ambient temperature fuel gas to flow through the bed Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 8:

The adsorbing capacity of a molecular sieve depends on the:

A - Pressure variation B - Vessel fluid flow rate C - Contaminants in the mixture D - Kind and amounts of components to be adsorbed Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 9:

One advantage of a molecular sieve hydrocarbon treating system is that:

A - Molecular sieve degradation does not occur when corrosion inhibitors are present B - High temperature gas regeneration is required C - Its capacity is not affected by pressure variations D - Removal of all polar compounds is achieved in a series of simple steps Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 10:

A molecular sieve vessel has exhausted the catalysts inside. The catalysts will be shipped away to be re-conditioned. You are in charge of removing the catalyst and preparing it for shipping. What safety issues are going to be most important during the process?

A - Wearing of breathing apparatus B - Wearing of protective clothing C - The catalyst catching fire D - a & b E - b & c Correctness Rule: Single Correct Answer Required Answer(s) Given: E Correct Answer(s): E Question 1:

Which phase of the molecular sieve operating cycle occurs after the bed has been cooled and the bed is brought up to operating condition by applying product from the storage vessel?

A - Cool and fill B - Repressurize C - Treating D - Regeneration Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 2:

During the molecular sieve regeneration cycle, sweet fuel gas is circulated through the adsorber at moderate pressure. This gas is heated in the regeneration gas heater to temperatures ranging from:

A - 260 - 315°C B - 225 - 260°C C - 240 - 275°C D - 360 - 415°C Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 3:

One disadvantage of a molecular sieve hydrocarbon treating system is that:

A - Molecular sieve degradation occurs when corrosion inhibitors are present B - The molecular sieve is corrosive C - Their capacity is affected by pressure variations D - These systems can only handle small streams of hydrocarbons Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 4:

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