Welcome to the website where you can pass online the CES CBT CD-8532 test on the subject «Ex Basic Refresher and Assessment». 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 «Ex Basic Refresher and Assessment». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Ex Basic Refresher and Assessment» subject includes theoretical and practical information about advanced training for work on any type of vessel. The test is designed to provide advanced training for personnel working on ships of various types. The course provides essential training for personnel working with potentially explosive atmospheres on board vessels. This advanced training revisits fundamental concepts of explosion hazards, flammable materials, and safe work practices in hazardous areas. Participants will refresh their knowledge of Ex equipment classifications, marking systems, and proper usage procedures. The test emphasizes the importance of risk assessment and permit-to-work systems for tasks involving Ex areas. Through practical exercises and simulations, trainees will demonstrate their ability to identify and mitigate explosion risks. The assessment component evaluates participants’ understanding of Ex principles and their competency in applying safe work practices. This refresher training ensures that personnel maintain their awareness and proficiency in handling potentially explosive environments. By completing this course, individuals contribute to a safer working environment and minimize the risk of accidents involving flammable materials on board vessels.
On this site Crew Evaluation System Test on the subject «Ex Basic Refresher and Assessment» contains 89 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.
Devices that are not able to store or generate energy.
Certified components.
Equipment that are not allowed in EX area.
Pumps and gear boxes.
An ignition source is the definition of?
A combustibles gas or liquid.
A high temperature or a spark capable of igniting.
An Ex equipment.
Are there any requirements for IP rating on «Ex e» equipment?
Yes, Minimum IP 45.
No, it’s not relevant for this concept.
Only if installed in dust atmospheres.
Are you always allowed to modify an Ex «e» junction box as you wish?
Yes, you may always mount extra gland.
Yes, you may always mount extra glands and switches.
No. Only in accordance with the manufacturer’s guidelines.
Blue cables are normally associated with?
Intrinsically safe circuits.
High voltage.
Single phase Power cables.
Can the extent of a zone be reduced through effective use of ventilation?
Yes. Both natural and mechanical ventilation may be used to limit the extent of zones.
No, may never have ventilation in an Ex area.
Only natural ventilation.
Do you need a risk assessment in connection with zoning of a facility?
No. A zone will always be the same regardless of the process.
Yes, we must assess risk connected to explosion hazards.
Only if there is suspicion of the zone extending further than the zonal chart shows.
Does there exist Ex «e» junction boxes made of GRP (Glass Reinforced Plastic)?
Yes.
No, GPR is not suitable material.
No, these must resist an internal explosion and may not be made of plastic.
Equipment with ATEX marking II 1 G has which level of safety?
Very high.
High voltage.
Normal.
How do the flame path in and Ex d enclosure work?
It is to have sufficient surface for gaskets.
They are designed to cool down an internal explosion so that the gases that leave the enclosure will not ignite an explosive atmosphere outside.
Since these most often are made of a material that corrodes, it is to have sufficient surface to wear down during maintenance.
How is EPL marked for equipment to be used in gas atmospheres?
With a small a, b or c behind the concept (E. g.: Ex eb) alternative Ga, Gb or Gc.
With a capital A, B or C clearly marked on the label.
With a small x, y or z behind the concept (E. g.: Ex ey) alternative Gx, Gy or Gz.
How many conductors are allowed under an earthing terminal on IS earth?
1.
2.
3.
4.
How many earthing wires may be connected to one screw?
1.
1 to 2.
2 to 3.
Hydrogen has a temperature class of T1. Are you allowed to use equipment marked with T3 in an area with Hydrogen present?
Yes.
No.
Only if it is secured with good ventilation and the ambient temperature is kept below 40 degrees Celsius.
If a gas mixed with air is below the LEL for the gas in question, is it:
Above the highest explosion limit.
Above the lowest explosion limit.
Below the lowest explosion limit.
In which Ex-zone is it allowed to use Exe motors?
0.
0 and 1.
1 and 2.
In which Ex-zone is it allowed to use the Exn motors?
0.
1.
2.
In which zone can we use this equipment: ATEX II 2 G?
Zone 0.
Zone 1.
Zone 2.
In which zone is it allowed to use Exib equipment?
0, 1 and 2.
1 and 2.
Only 2.
Is an Ex «ib» circuit suitable for zone 0?
No, only zone 1 and 2.
Yes.
Yes, if the field device has a floating screen.
Is there a need for maintenance on Ex «e» equipment?
Yes, in accordance to relevant, current standards.
No, this equipment must be designed as maintenance free.
Only requirements for cleaning.
May modifications inside an Ex «p» enclosure have any consequences?
Yes, it may cause the T-class and «purge time» to be altered, and this may only be performed by approved workshop or a notified body.
No, not as long as it is not placed in zone 0.
Only if one does not perform sufficient calculations.
May one open Ex «d» equipment that are in use in order to inspect it?
If you are careful.
Only during the night shift.
Yes.
No, not without isolating it from the source of supply or have a suitable procedure with gas measurement.
May you install uncertified equipment in an Ex «e» box?
Yes, since Ex «e» has overpressure.
Yes, since Ex «e» is moulded.
Yes, since Ex «e» is increased safety.
No. All equipment in an Ex «e» box must be certified and covered by the certificate of the component.
Of the following, what is NOT defined as a potential source of release?
Welded pipes.
Around process valves that could leak under normal operations.
Flanges.
What are the requirements for distance between IS and non-IS circuits?
3 mm.
6 mm.
50 mm.
200 mm.
What determines which gas groups a gas is placed in?
Explosion properties and flashpoint.
Ignition energy and explosion properties.
Ignition temperature and explosion properties.
What does the «T-class» on an Ex component describe?
The highest temperature the relevant surface of this component is able to achieve.
Resistance class against static influence.
The ambient temperature allowed for the area.
What does the «U» in the end of a certificate reference mean. For instance PRESAFE ATEX 0989 U?
Only component certified.
It has specific conditions for safe use.
Only allowed in zone 2.
What does the «X» in the end of a certificate reference mean?
Spelling mistake in the certificate.
This component is not ready for use and must be certified by an able 3rd party.
There are special conditions for safe use.
What does the housing IP-grade show?
Protection against gas.
Protection against water and dust.
Protection against power surge.
What does the letter «e» mean in Ex-marking?
Explosion-proof equipment.
Intrinsically safe equipment.
Increased safety equipment.
What does the letter «i» mean in Ex-marking?
Explosion-proof equipment.
Increased safety equipment.
Intrinsically safe equipment.
What does this marking mean: EEx ib IIB T5?
Explosion-proof equipment, approved for zones 1 and 2.
Intrinsically safe equipment, approved for zones 1 and 2.
Increased safety equipment, approved for zones 1 and 2.
What information does EPL provide?
Equivalent to ATEX category, indicating which zone it is suitable for.
Classification of protection against static influence.
Impact resistance of the product.
What is DSBs area of responsibility?
Offshore and ship industry in Norway.
Onshore and other process plants not associated with the oil industry in Norway.
Only dust atmospheres in Norway.
What is Te time on an Ex «e» motor?
Cooling time after over-load.
The start-up time for the motor.
It is the time it takes for the engine to reach the temperature limit for the T-class marked on the equipment, when the rotor is locked.
What is particularly important with Ex d flame path?
That they are kept clean and not damaged.
That they are coated with paint.
That they must be brushed down by the user when there is deep rust.
What is the flash point of liquid?
The temperature where the surface of a liquid emits enough vapour to be able to ignite.
100 degrees Celsius.
The explosion temperature.
What is the maximum allowed resistance between connection point and main earthing in the intrinsically safe circuits?
0,1 Ohm.
1,0 Ohm.
10 Ohm.
What is the maximum temperature an equipment marked with T1 is allowed to reach?
100 degrees Celsius.
200 degrees Celsius.
300 degrees Celsius.
450 degrees Celsius.
What is the maximum temperature an equipment marked with T6 is allowed to reach?
85 degrees Celsius.
100 degrees Celsius.
200 degrees Celsius.
300 degrees Celsius.
What is the minimum required distance between intrinsically safe end connections and non-intrinsically safe connections?
30 mm.
50 mm.
500 mm.
What is the minimum required distance between the intrinsically safe end connections and earthed metal?
3 mm.
5 mm.
10 mm.
What is the normal ambient temperature for Ex equipment?
-10 °C to +40 °C.
-20 °C to +40 °C.
-20 °C to +50 °C.
What is the principle behind Ex «m»?
Components able to generate heat or sparks are encapsulated in a potting compound.
Components able to generate heat or sparks are encapsulated in powder or sand.
Components able to generate heat or sparks are submerged in oil.
What is the principle behind Ex «o»?
Components able to generate heat or sparks are encapsulated in a potting compound.
Components able to generate heat or sparks are submerged in oil.
Components able to generate heat or sparks are encapsulated in powder or sand.
What is the principle behind Ex «q»?
Components able to generate heat or sparks are encapsulated in a potting compound.
Components able to generate heat or sparks are submerged in oil.
Components able to generate heat or sparks are encapsulated in powder or sand.
What is the principle behind Ex «p»?
There is an overpressure inside the enclosure that ensures that the explosive atmosphere surrounding the enclosure does not come in contact with the sources of ignition inside.
It must be able to resist an internal explosion.
No components that generate sparks are allowed inside the enclosure.
What is the relationship between ATEX category and zone?
The ATEX category represents the zone it is suitable for use in.
The ATEX category represents the IP rating on the equipment.
The ATEX category represents the temperature class of the equipment.
What is the relationship between EPL and ATEX categories?
EPL is not related to EX equipment.
ATEX categories and EPL are providing the same information telling the Zone of use.
EPL never appears at the same time at ATEX marking and only pertains to IECEX equipment.
What is the shortest distance allowed between the parallel flame paths of an Ex d enclosure and an obstruction if placed in a IIB atmosphere?
30 mm.
100 mm.
200 mm.
500 mm.
What is the standard ambient temperature for an Ex equipment if there is no marking of ambient temperature?
-10 to +20 degrees Celsius.
-20 to +40 degrees Celsius.
-50 to +50 degrees Celsius.
What is the subject of the ATEX directive 94/9/EC?
Products and protection systems for use in potentially explosive areas.
Classification in zones.
Health and safety.
What zone is equipment marked with EPL Ga intended for use in?
Zone 0, 1 and 2.
Only zone 1.
Only zone 2.
Zone 2 and less hazardous areas.
When can you install equipment in a higher ambient temperature than what is standard for Ex equipment?
When the extended temperature range is marked on the equipment.
It is not possible.
When the user has tested the temperature range first.
Where does the FUSEX directive apply? This is based on ATEX 94/9/EC and applies for equipment.
Offshore.
Onshore and offshore.
Onshore.
Where is PTIL’s/PSA area of responsibility?
Offshore installations and associated refineries on the Norwegian sector.
Only tankers on the Norwegian sector.
Refineries with storage capacity over 100 000 barrels on the Norwegian mainland.
Where is zone 0 most likely located?
Around ventilation that could leak under normal operations.
Around welded pipes.
Inside a tank.
Which ATEX area marking applies for coal mines?
I.
I and II.
II.
Which Ex-equipment is allowed to use in zone 0?
Ex ia.
Ex e.
Ex ib.
Which colour marks the intrinsically safe circuit cables?
Black.
Red.
Light blue.
Yellow.
Which colour may be used to indicate intrinsically safe circuits?
Black.
Grey.
Purple.
Light blue.
Which criteria must you base the decision on, when selecting equipment for use in zone?
Gas group.
T-Class.
Zone.
All of them.
Which equipment is not allowed to use in zone 1?
Exn equipment.
Exi equipment.
Zone 0 equipment.
Which equipment may be used if there is a requirement for T3 equipment?
T1, T2, T3.
T3, T4, T5, T6.
All.
Which equipment requires Exd glands?
Ex d.
Ex e.
Ex i.
Which gas group holds gasses with the quickest increase of pressure when ignited?
IIA.
IIB.
IIC.
Which gas group holds gasses with the slowest increase of pressure when ignited?
IIA.
IIB.
IIC.
Which gaskets may be used with an Ex d enclosure?
Any type as long as it is sufficiently fastened.
Only the manufacturers original gasket, provided it is allowed for the enclosure in question.
Only gaskets that cover the entire flame path.
Which is the marking for oil-filled devices?
Ex d.
Ex i.
Ex o.
Ex p.
Which is the marking for over-pressure devices?
Ex d.
Ex i.
Ex o.
Ex p.
Which marking do you expect to find on a flameproof enclosure with indirect entry?
Ex de.
Ex qe.
Ex d.
Which of the following are you allowed to use in an area with potentially explosive atmospheres of IIB gas.
IIA equipment.
IIB and IIC equipment.
All Ex equipment.
Which of the following is an ignition source?
Hot surfaces.
An Ex e light fixture.
An explosion proof enclosure.
Which part of an explosion triangle is removed by the use of Ex equipment?
The Ignition source.
The Gas or flammable substance.
The Oxygen.
Which power-supply system is not allowed to use in the explosion-hazard areas?
TN-C.
IT.
TN-S.
TT.
Which protection concept is based on allowing an internal explosion while preventing ignition of the atmosphere outside the enclosure?
Ex «d».
Ex «i».
Ex «o».
Ex «p».
Which protection concept is based on limiting the energy in a circuit?
Ex «d».
Ex «i».
Ex «o».
Ex «p».
Which temperature is equipment marked with T3 guaranteed to reach?
The equipment is only guaranteed to not exceed its T-class, and not necessarily to reach this temperature.
85 degrees Celsius.
200 degrees Celsius.
300 degrees Celsius.
Which zone is normally associated to the inside of a tank with a flammable substance?
0.
1.
2.
Who is allowed to repair the Ex-equipment?
Certified workshop.
An electrician who has taken the Ex-course.
End user.
Who is responsible for placing the ATEX mark on components?
Manufacturers or importers of the equipment.
Facility owner.
User.
Who may drill new holes for glands in an Ex d enclosure?
A qualified Electrician. Note: Needs Ex Basic training.
Owner.
The user.
Only an approved workshop or the manufacturer.
Who may not repair serious defects and do flame-path repairs?
Certified workshop.
End user.
Manufacturer.
Will an Ex «e» box be able to resist an internal explosion?
No.
Only with IIB and IIA gases.
Yes.
With which equipment is it not allowed to use Ex e glands?
Exd with direct cable entry.
Exd with indirect cable entry.
Exe.
With which gas group is it allowed to use the class IIB equipment?
IIA gases.
IIA and IIB gases.
All gases.
With which gas group is it allowed to use the class IIC equipment?
IIA gases.
IIA and IIB gases.
All gases.
Did you find mistake? Highlight and press CTRL+Enter
