Welcome to the website where you can pass online the CES CBT CD-0377 test on the subject «Sewage Treatment System». Practice like this will help you as a marine specialist improve your knowledge with the help of online studying and appraisal practice. CES based on practical information and marine specialists experience.
CES tests developed for evaluating seaman basic knowledge by Seagull Company (rebranded as «OTG»), is an evaluating online-tool, used for revealing any professional preparation needed in specific fields of knowledge, defined by STCW.
CES tests have proven themselves as good tools for the selection and recruitment process, as well as advancing the level of knowledge of the current officers and crew. Ocean Technologies Group use various subjects for question creation, which includes:
Crowd and Crisis Management;
Integrated Navigation System (INS);
Ballast water management;
Handling and Stowage;
Vessel operation management and safety;
Marine engineering;
Maintenance and repair, etc.
Current test contains Seagull CES questions on the subject «Sewage Treatment System». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Sewage Treatment System» subject includes theoretical and practical information about advanced training for work on any type of vessel.
On this site Crew Evaluation System Test on the subject «Sewage Treatment System» contains 16 questions you need to answer with no possibility to go back to previous question. Therefore, we recommend carefully reading each question and making decision with no hurry. In case you have some difficulty answering, you have also possibility to request a hint.
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Exam
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* Some questions may have more than 1 correct answer.
What are the products from the “Anaerobic” breakdown of sewage?
Water, oxygen and an inert residue.
Water, carbon monoxide, methane and an inert residue.
Water, carbon di-oxide, hydrogen sulphide, methane and an inert residue.
Water, carbon di-oxide and an inert residue.
Which of these is defined as “sewage” under MARPOL?
Drainage from the dispensary or sick bay.
Drainage from the galley sink.
Drainage from the dishwasher.
Drainage from the laundry.
What are the products from the “Aerobic” breakdown of sewage?
Water, hydrogen sulphide and an inert residue.
Water, methane and an inert residue.
Water, hydrogen sulphide and carbon di-oxide.
Water, carbon di-oxide and an inert residue.
Which of these is considered as being “grey water“?
Drainage from the dispensary or sick bay.
Drainage from the galley sink.
Drainage from spaces containing animals.
Drainage from urinals.
If there is a smell of “sewage” in toilets or bathrooms of the accommodation, why should this be investigated immediately? Select the ONE best answer.
Because it might mean that the accommodation fans are not working properly.
Because it might mean that a waste pipe somewhere is blocked.
Because it could mean that toxic gasses are being released into the accommodation.
Because it might mean that a sewage pipe is leaking.
Which parts of a sewage storage or treatment system need to be ventilated to remove CO2 and other gases?
Only storage tanks, because sewage can stagnate there.
Only those places where we supply air to process the sewage.
Anywhere that sewage is stored or treated.
Only the treatment tank, where we are encouraging the growth of bacteria.
When more than 12 miles from land, under MARPOL Annex IV, how fast must the ship be moving before it can discharge untreated sewage?
Once over 12 miles from land, there is no requirement for the vessel to be moving.
The ship must be “en-route” and travelling at a speed of at least 4 knots.
The ship must be “en-route” but no speed is given in the rules.
The ship must be “en-route” and travelling at a speed of at least 12 knots.
Your ship is just over 3 miles from land, and not in a special area. Under MARPOL Annex IV regulations, what is the minimum treatment required before sewage can be released at a moderate rate?
It must be discharged via a macerator pump.
It must have been disinfected.
It must have been held in storage for at least 48 hours.
It must have been comminuted and disinfected.
When more than 3 miles from land, under MARPOL Annex IV, how fast must the ship be moving before it can discharge sewage that has been only comminuted and disinfected?
There is no requirement for the vessel to be moving if the sewage has been comminuted and disinfected.
The ship must be “en-route” and travelling at a speed of at least 4 knots.
The ship must be “en-route” but no speed is given in the rules.
The ship must be “en-route” and travelling at a speed of at least 12 knots.
Under MARPOL Annex IV regulations, how far must a ship be from land before untreated sewage can be released at a moderate rate?
At least 12 miles if the ship is at anchor, or 3 miles if the ship is en-route.
At least 12 miles, and the ship must be en-route.
At least 3 miles, and the ship must be en-route.
At least 3 miles, unless the ship is in a special area.
Under MARPOL Annex IV, how fast must the ship be moving before it can discharge sewage that has been treated in an “Approved” sewage treatment plant?
The ship must be “en-route” and travelling at a speed of at least 12 knots.
The ship must be “en-route” but no speed is given in the rules.
There is no requirement for the vessel to be moving if an approved sewage treatment plant is used.
The ship must be “en-route” and travelling at a speed of at least 4 knots.
Why are “vacuum” sewage systems used?
They help break the sewage down.
They are less expensive that conventional systems.
They are easier to install and maintain.
They reduce water consumption and require a smaller holding tank.
Some types of aerobic sewage plants have sections of clear piping just above the tank. What are these for?
So that operators can check that the sewage discharge is clear.
So that operators can check that sewage is entering the tank.
So that operators can check that the air lifts are working.
To allow for differential expansion of the pipework.
Why do the IMO place a limit on the amount of residual Chlorine for type approval of a sewage treatment system?
To make sure that there is more than enough chlorine to kill off bacteria.
To reduce the harmful effects of putting chlorine into the sea.
To limit deposits and corrosion in the discharge pumps and piping system.
To make sure that sewage treatment is cost effective.
A sample of treated sewage has a high “Biochemical Oxygen Demand“. What does this mean?
That the sewage treatment has been effective, since anaerobic bacteria are thriving.
That too much air has been used in the sewage treatment tank.
That the sewage treatment has been effective, since aerobic bacteria are thriving.
That the sewage treatment is incomplete.
What are Coliform bacteria, and why do we measure how many there are in treated sewage?
They are the anaerobic bacteria which multiply rapidly if there is not enough air supplied to the sewage treatment tank.
They are the aerobic bacteria which are needed for effective sewage treatment.
They are the bacteria present in the human intestine and how many are left in treated sewage gives us a guide to how effective treatment has been.
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