Welcome to the website where you can pass online the CES CBT CD-0425 test on the subject «Gas Measurement – A Safe Atmosphere». 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 «Gas Measurement – A Safe Atmosphere». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Gas Measurement – A Safe Atmosphere» subject includes theoretical and practical information about advanced training for work on any type of vessel. This test provides knowledge on the principles of gas detection and monitoring, essential for ensuring safety on various types of vessels. The course covers practical training in the use of gas detection equipment, enabling crew members to accurately measure and interpret levels of potentially hazardous gases. Participants will learn how to identify and respond to dangerous gas leaks, ensuring a safe working environment in enclosed spaces such as cargo holds, engine rooms and tanks. Through hands-on exercises, trainees gain proficiency in calibrating gas measurement devices, ensuring accurate readings and compliance with international safety standards. The test emphasizes the importance of regular gas monitoring procedures, helping maritime professionals prevent accidents and protect both human life and the marine environment. Upon completion of the training, crew members are better prepared to implement effective gas control measures, enhancing overall safety and operational efficiency onboard vessels.
On this site Crew Evaluation System Test on the subject «Gas Measurement-A Safe Atmosphere» contains 20 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.
Choose the regime, in which you want to pass CES test:
Training
Exam
Wild Mode
* Some questions may have more than 1 correct answer.
If the oxygen content of an enclosed space is less than 20 %, under what conditions should entry be made by personnel? Select the ONE correct answer.
In an emergency, only using suitable breathing equipment.
For a short period only using breathing equipment.
Only in pairs using breathing equipment.
Using breathing equipment.
Stagnant water, some sewage systems and some oil cargoes can all be the source for a gas which is both flammable and toxic. What is this gas? Select the ONE correct answer.
Carbon dioxide.
Hydrogen chloride.
Hydrogen sulphide.
Nitrogen.
The combustion control of an independent inert gas generator, supplying inert gas to a cargo tank system, is incorrectly set, giving incomplete combustion. What is the likely effect of this? Select the ONE correct answer.
Increased level of hydrogen sulphide gas in the inert gas.
Increased level of NOx and SOx in the inert gas.
Increased level of carbon monoxide in the inert gas.
Increased level of oxygen in the inert gas.
The oxygen content in an enclosed space falls below 21 % during entry by personnel. What action should be taken? Select the ONE correct answer.
Complete the work as quickly as possible.
Increase the ventilation and continue working.
Stop the work and put on breathing apparatus before carrying on.
Stop working and leave the space immediately.
What are the TWO main reasons for measuring the oxygen content of an enclosed space onboard a ship? Select the TWO correct answers.
To check if the oxygen content is low enough to avoid flammable mixtures.
To check the amount of hydrocarbon gas present.
To ensure the oxygen content is sufficient to allow safe entry.
To check the amount of toxic gases present.
What is the effect on the oxygen content of the atmosphere of an enclosed space if hydrocarbon gases are present? Select the ONE correct answer.
No effect.
Oxygen content is increased.
Oxygen content is reduced.
The effect cannot be determined.
What is the most common source of hydrogen sulphide gas in enclosed spaces onboard a ship? Select the ONE correct answer.
Combustion of distillate fuel oil in the inert gas generator.
Incomplete combustion of fuel oil in a boiler furnace.
Low sulphur marine fuel oil being used in a diesel engine.
Sour crude or petroleum products from sour crude in tanks.
What is the most likely reason for the presence of high levels of oxides of Nitrogen and Sulphur (NOx and SOx) in the atmosphere of a cargo tank on an oil tanker? Select the ONE correct answer.
A cargo of heavy fuel oil with a high sulphur content has been carried in the tank.
Sour crude oil has been stored in the tank.
Inert gas from the combustion of fuel oil has been used to inert the tank.
The tank has been fully gas freed following discharge of cargo.
What is the normally accepted value for the lower explosive limit, LEL, for hydrocarbon gas in a cargo tank? Select the ONE best answer.
1 % by volume.
8 % by volume.
10 % by volume.
21 % by volume.
What is the normally accepted value for the maximum oxygen content in an inerted cargo tank? Select the ONE correct answer.
1 % by volume.
5 % by volume.
8 % by volume.
21 % by volume.
What is the normally accepted value for the upper explosive limit, UEL, for hydrocarbon gas in a cargo tank? Select the ONE best answer.
1 % by volume.
8 % by volume.
10 % by volume.
21 % by volume.
What is the purpose of gas freeing a cargo tank? Select the ONE correct answer.
To replace the contents with fresh air.
To remove the hydrocarbon gases only.
To remove the inert gas only.
To replace the contents with inert gas.
What is the time period that is normally used when stating threshold limit values for the Time Weighted Average for exposure, TLV – TWA, for toxic gases? Select the ONE correct answer.
15 minutes.
1 hour.
8 hours.
24 hours.
What is the time period used when stating threshold limit values for the Short Term Exposure Limit, TLV – STEL, for toxic gases? Select the ONE correct answer.
5 minutes.
15 minutes.
1 hour.
8 hours.
When rusting of ship’s steelwork occurs, which ONE of the following is the main effect on the air inside a ballast tank or cargo tank?
The oxygen content of the air decreases.
Carbon dioxide is given off by the rusting process.
The air develops a bad smell.
The oxygen content of the air increases.
Which ONE of the following options best completes the following statement? Onboard ship, an enclosed space is any space which …
… has a danger sign at the entrance.
… has limited ventilation or could contain toxic or flammable vapours.
… has four walls and a ceiling.
… is not open to the atmosphere.
Which ONE of the following statements best describes the term «Occupational Exposure Limit» (OEL)?
It is a guide to safe exposure to toxic products, based on the amount of a given substance and the time in contact it.
It is a guide to safe exposure to harmful ultra violet (UV) rays when working on deck.
It is a guide to safe exposure to toxic products, based only on the amount of a given substance present.
It is a guide to safe exposure to toxic products, based only on the time in contact with the substance.
Which ONE of these statements best describes the effects some cargoes can have on the atmosphere in a cargo space?
No effect, because any harmful cargoes are sealed.
They can use up or displace oxygen and give off toxic or flammable gasses.
The atmosphere can develop a bad smell.
Very little effect, since the spaces are ventilated.
Which of the following toxicity threshold limit exposure terms would normally have the lowest numerical value? Select the ONE correct answer.
TLV – TWA.
TLV – C.
TLV – STEL.
TLV.
Which term is used for the property of a gas that has a long term harmful effect on a living organism as a result of repeated or long term exposure to even low concentrations of the gas? Select the ONE correct answer.
Acute toxicity.
Chronic toxicity.
Long toxicity.
Low toxicity.
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