Welcome to the website where you can pass online the CES CBT CD-7032 test on the subject «TOTS 1B-Fixed and Portable Gas Detections Systems». 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 «TOTS 1B-Fixed and Portable Gas Detections Systems». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«TOTS 1B-Fixed and Portable Gas Detections Systems» subject includes theoretical and practical information about advanced training for work on any type of vessel. The test provides advanced training for personnel working on various types of vessels, focusing on the detection and measurement of hazardous gases. This training covers the principles of gas detection, including the types of gases encountered on board vessels, such as hydrocarbons, hydrogen sulfide and carbon monoxide. Participants learn about the different types of gas detection systems, including fixed and portable systems and the advantages and limitations of each. The course also covers the calibration, maintenance and testing of gas detection equipment, as well as the interpretation of gas detection readings. Practical exercises and simulations are conducted to demonstrate the use of gas detection equipment in various scenarios, including emergency situations. Upon completion, participants are equipped with the knowledge and skills to operate and maintain fixed and portable gas detection systems on board vessels, ensuring a safe working environment for crew members.
On this site Crew Evaluation System Test on the subject «TOTS 1B-Fixed and Portable Gas Detections Systems» contains 36 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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* Some questions may have more than 1 correct answer.
A fixed gas detection system for toxic gas normally uses electro-chemical detectors. What level of accuracy can be expected?
Approximately 5 ppm.
Approximately 50 ppm.
Approximately 10 % by volume.
Approximately 30 % by volume.
After washing and gas-freeing from a toxic cargo, what type of gas detection equipment should you use before entering a cargo tank?
A tankscope.
An Explosimeter.
Chemical indicator tubes.
An infrared gas detector.
Cotton filters are sometimes used with hydrocarbon gas detectors. What is their purpose?
To remove water from the sample.
To prevent chemical contamination of the sample.
To remove dust from the sample.
To stop pressure surges in the sample line.
For how long must the ventilation of a space be stopped before conducting tests of the atmosphere for an Enclosed Space Entry?
10 minutes.
30 minutes.
Briefly, while the tests are being carried out.
The ventilation should be run continuously.
How will leaks in the sample pipework affect the operation of a fixed gas detection system?
It will cause failure due to high flow rate.
It will cause failure due to low suction pressure.
It will cause lower readings due to dilution of the sample.
It will cause higher readings due to increased flow rate.
How will leaks in the sampling line affect the operation of portable gas detection equipment?
It will cause lower readings due to dilution of the sample.
It will cause failure due to high flow rate.
It will cause failure due to low suction pressure.
It will cause higher readings due to increased flow rate.
If an Explosimeter is calibrated using span gas containing 1 % butane in air, what reading may be expected?
Approximately 1 % Lower Flammable Limit.
Approximately 10 % Lower Flammable Limit.
Approximately 50 % Lower Flammable Limit.
Approximately 100 % Lower Flammable Limit.
Multi-toxic gas detectors normally use electro-chemical detectors. What level of accuracy can be expected?
Approximately 1-5 ppm.
Approximately 100-500 ppm.
Approximately 10 % by volume.
Approximately 30 % by volume.
Span gas is generally used for calibration of a fixed gas detection system. What is the composition of this gas?
A proprietary mixture of nitrogen and carbon dioxide.
Approximately 1 % butane in air.
Approximately 40 % propane in air.
Pure nitrogen.
What effect will inert gas have on the operation of an infrared type gas detector?
None. The instrument is not affected by the absence of oxygen.
It will Increase the reading by increasing the temperature of the chamber.
It will reduce the reading by contaminating the sensor.
Small particles may obscure the mirrors.
What instrument should you use to test for very low levels of oxygen before loading a sensitive cargo?
A paramagnetic oxygen analyser.
An Explosimeter.
Chemical indicator tubes.
An infrared gas detector.
What instruments must be provided to comply with the statutory requirements for ships fitted with an inert gas plant?
An oxygen analyser and an instrument to measure the percentage of hydrocarbon gas in an inerted atmosphere.
An Explosimeter and an oxygen analyser.
At least two instruments to measure the percentage of hydrocarbon gas in an inerted atmosphere.
At least two instruments to measure the percentage of oxygen in an inerted atmosphere.
What is a «Pellistor»?
It’s a poison resistant catalytic filament.
It’s a balancing resistor between the sensing element and a fixed compensator.
It’s a filter which prevents the spread of flame.
It’s a protective device which removes contaminants.
What is a «Sintered Filter», and what is its purpose?
It’s a flashback arrestor used to prevent flame from escaping from the combustion chamber.
It’s a cotton wad used to prevent water from entering the combustion chamber.
It’s a fine metal filter used to prevent contamination of the sensor.
It’s an electronic device used to smooth the signal from the sensor.
What is the composition of the span gas generally used for calibration of an Explosimeter?
Approximately 1 % butane in air.
Approximately 40 % propane in air.
A proprietary mixture of nitrogen and carbon dioxide.
Pure carbon dioxide.
What is the composition of the span gas generally used to zero a portable oxygen analyser?
Approximately 2 % propane in air.
Approximately 20 % propane in air.
Fresh air.
High purity nitrogen or carbon dioxide.
What is the gas concentration alarm level on a fixed gas detection system?
10 % of flammable gas.
30 % of flammable gas.
3 % of Lower Flammable Limit.
30 % of Lower Flammable Limit.
What is the principle by which a thermal conductivity meter works?
To show a change in temperature of an electrically heated resistance element, due to heat loss to the gas sample by conduction.
To show a change in resistance of an electrically heated resistance element, due to heat loss to the gas sample by conduction.
To show a change in the conductivity of a heated gas sample relative to that of air.
To show change in the density of a heated gas sample relative to that of air.
What is the principle by which an infrared gas detector operates?
It senses the level of absorption of infrared radiation in the sample.
It compares the electrical resistance of the sample with fresh air.
It compares the relative density of a sample which has been heated by an infrared source.
It measures the resistance of a sample which has been heated by an infrared source.
What is the principle by which chemical absorption indicators operate?
To compare the chemical absorption rate of the sample with fresh air.
To sense the proportion of a sample which is absorbed by a catalyst.
To show whether a toxic gas will be absorbed by the human body.
By passing the sample through a proprietary chemical, the gas concentration is indicated by its changing colour.
What level of accuracy can be expected when using toxic gas detection tubes?
Approximately 1 ppm, depending on the type of tube in use.
Approximately 100 ppm, depending on the type of tube in use.
Approximately 10 %, depending on the type of tube in use.
Approximately 30 %, depending on the type of tube in use.
What operational tests should be made routinely before using a gascope?
Checking the battery level and zero using fresh air.
Checking the battery level and self-testing alarm functions.
Checking the battery level and zero using nitrogen or carbon dioxide.
Checking the reference point with span gas and zero using atmospheric air.
What operational tests should be made routinely before using a tankscope?
Checking the battery level and zero using fresh air.
Checking the battery level and self-testing alarm functions.
Checking the battery level and zero using nitrogen or carbon dioxide.
Checking the reference point with span gas and zero using atmospheric air.
What operational tests should be made routinely before using an Explosimeter?
Checking the battery level and zero using fresh air.
Checking the battery level and self-testing alarm functions.
Checking the battery level and zero using nitrogen or carbon dioxide.
Checking the reference point with span gas, and zero using atmospheric air.
What operational tests should be made routinely before using an oxygen analyser?
Check battery level, reference point with span gas, and zero using nitrogen or carbon dioxide.
Check the battery level, and self-test the alarm functions.
Check battery level, reference point with atmospheric air (21 %), and zero using nitrogen or carbon dioxide.
Check the reference point with span gas and zero using atmospheric air.
What property of oxygen is utilised in a paramagnetic oxygen analyser?
Oxygen is strongly attracted to a magnetic pole.
Oxygen molecules will break up in a magnetic field.
The electrical resistance of oxygen changes in a magnetic field.
The strength of a magnetic field is reduced in the presence of oxygen.
What type of sensor is fitted in a tankscope?
A non-catalytic heated filament.
A catalytic filament resistor.
A magnetic induction sensor.
A PT100 temperature sensor.
What type of sensor is fitted in an Explosimeter?
A gas diffusion filter.
A magnetic resonance chamber.
A catalytic filament resistor.
A non-catalytic heated filament.
What will be the effect of hydrogen sulphide on the reading shown on a Combustible Gas Indicator (Explosimeter)?
It will reduce the reading by contaminating the sensor.
It will give a zero reading by destroying the sensor.
It will have no effect because it is non-flammable.
It will increase the reading by raising the sensitivity of the sensor.
What would you use a personal oxygen meter for?
For checking the atmosphere of a ballast tank before entry.
For testing an enclosed space before starting hot work.
For testing the atmosphere of an open space before starting hot work.
For monitoring atmospheric conditions during an enclosed space entry.
When changing high purity cargo grades, what instrument should be used to ensure that tanks are free of the previous product?
Chemical indicator tubes.
A tankscope.
An Explosimeter.
An infrared gas detector.
When starting to test a sample using a Combustible Gas Indicator (Explosimeter), the needle immediately flicks to maximum deflection, and then returns to zero. What is indicated?
That the battery is incorrectly fitted.
That the flammable gas concentration is above the Lower Flammable Limit.
That the instrument was not warmed up, but is now working correctly.
That the sensor element has been contaminated by toxic gas.
Why is it necessary to use a water-retaining filter in the sample line of an oxygen analyser?
Because water vapour in the sample will cause damage to the measuring cell.
Because water in the sample will corrode the internal parts of the instrument.
Because water reacts with the measuring cell, giving a false reading.
Because water will build up in the sample line, reducing the flow.
Why must chemical absorption tubes only be used with pumps from the same manufacturer?
Because the pump and tube are matched to ensure that the correct volume of sample gas is tested.
Because the tubes will not fit correctly into another manufacturer’s pump.
Because using different tubes breaks the terms of the contract with the manufacturer.
Because using the wrong tubes may lead to contamination of the pump.
Why must the span gas pressure be carefully controlled when calibrating a fixed gas detection system?
Excess pressure may cause errors in the readings.
Excess pressure may cause leaks in the system.
Excess pressure may damage the catalytic sensing element.
If the pressure is too high, it could cause an explosion inside the equipment.
Why must the tank atmosphere be sampled at a variety of positions when testing before entry?
To allow for the density of the gas and to ensure that any collected in dead spots is detected.
To ensure that enough gas is drawn through the equipment to avoid it remaining in the sampling line.
To make sure that the detection equipment is working correctly.
To obtain an average reading throughout the tank.
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