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Crew Evaluation CBT Test Online on Electrical Exi Installation (CD-8534)

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Welcome to the website where you can pass online the CES CBT CD-8534 test on the subject «Electrical Exi Installation». 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 «Electrical Exi Installation». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.

«Electrical Exi Installation» subject includes theoretical and practical information about advanced training for work on any type of vessel. The test is designed to provide training for personnel working on ships of various types. It is a comprehensive course that integrates both theoretical knowledge and practical skills essential for electrical systems on different types of vessels. The program is specifically designed to provide advanced training for maritime personnel, ensuring they are well-prepared to handle complex electrical installations aboard ships. Participants will study the fundamentals of marine electrical engineering, including power generation, distribution and management systems used on different vessels. The test has topics such as navigation electronics, communication systems and emergency power solutions tailored to the maritime environment. Hands-on practical sessions enable trainees to apply their knowledge by working with actual electrical components and installation procedures in simulated ship settings. The course emphasizes safety protocols and industry standards to ensure that all electrical installations meet the stringent requirements of maritime operations. Advanced modules include the integration of renewable energy sources and automation technologies, preparing personnel for the evolving demands of modern shipping. Upon successful completion, sailors will possess the expertise needed to install, maintain and troubleshoot electrical systems effectively, contributing to the safe and efficient operation of a wide range of vessels.

On this site Crew Evaluation System Test on the subject «Electrical Exi Installation» contains 39 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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Amount of questions: 39.

Right answers marked with this sign .

Can a Zener barrier be polarity dependent?
Yes.
No.
Only the output for the Hazardous area.
Can a non-certified measuring device affect an IS loop?
Yes, it might add energy to the loop or affect the inductance and capacitance in the loop.
No, the barrier detects a potential high energy from the field and starts reducing the voltage in the loop.
Only when connected in the field device end.
Can we use a circuit for gas group IIC in an environment with IIA gas?
Yes.
No.
Only if the level of protection is «ia».
Can we use an Ex «nL» field device in an Ex «ic» circuit?
No.
No, only in an Ex «ia» or «ib» circuit.
Yes.
Can we work on live IS circuits in a hazardous environment?
Yes.
No, the enclosures of Ex «i» shall be able to contain an internal overpressure.
No, the potential sparks may ignite a gas.
Could a Zener barrier be used in a circuit for an IIC gas?
No only IIA.
Yes.
Only IIA and IIB.
Does a Zener barrier require an earth connection?
No.
Yes.
Only when used for Zone 0.
How does the Zener barrier work?
It converts the signals from the hazardous area to 4-20mA for instrumentation circuits.
It provides a galvanic isolation between safe area and zone.
It has Zener diodes working as voltage suppressors and a resistor limiting the current.
How many faults shall Ex «ib» circuits be safe with?
1.
2.
None, only safe during normal operation.
How many faults shall Ex «ic» circuits be safe with?
1.
2.
3.
None, only safe during normal operation.
How many levels of protection are there on the Ex «i» concept?
Only «ia».
«ia», «ib».
«ia», «ib», «ic».
How should the screen of an IS circuit be connected?
As described in the loop drawings.
Only connected to earth in the field device.
To PE in both ends.
If a barrier is has a level of protection [Ex ia] and a field device has Ex ib, what is the best level of protection this circuit will achieve?
«ia».
«ib».
«ic».
If a barrier must be replaced and the identical spare is not on stock, can we replace this with another?
No, only like for like.
Yes, only consider the level of protection ( «ia» for «ia», «ib» for «ib»).
Yes, if the safety parameters are reassessed and the documentation updated.
If a color is used for IS, this shall be?
Light blue.
Light grey.
Red.
If a field device suitable for gas group IIC is supplied from a barrier suitable for gas group IIB, can this be installed in an IIC environment?
Yes, as long as only the field device is in the IIC environment.
Yes, the complete circuit are safe for both IIB and IIC gases, but not IIA.
No, the complete circuit will never be better than the weakest component.
Intrinsically safe circuits are:
Low energy circuits.
Able to contain an explosion.
Ex «n» (Non-incendive).
Non sparking.
Is the T-class important on the field devices in an IS circuit?
Yes, all the components in zone must have a T-class.
No, the energy is limited, so no T-class is required.
Only for «ia» and «ib».
Is the gas group relevant for Ex «ia» circuits?
No.
Yes.
Only for Ex «ib» and «ic» circutis.
Of the following, what can be defined as simple apparatus in an IS loop?
Junction boxes and plugs.
Only junction boxes.
Only plugs.
Transmitters working at maximum 24VDC and 0-25 mA.
On a Zener barrier located in an unclassified area, is the T-class relevant?
Yes, all Ex components shall have a T-class even if installed outside of zone.
Yes, as this describes the circuits T-class.
No.
The level of protection «ic» is suitable for Zone?
Depends on other factors, it is suitable for a IIC gas.
Zone 1 and 2.
Zone 2.
All Zones.
What does Ci and Li on a certified field device describe?
The maximum internal capacitance and inductance in the device.
The maximum allowable capacitance and inductance in the loop.
The minimum internal capacitance and inductance in the device.
What does Co and Lo on an associated apparatus (barrier) describe?
The maximum internal capacitance and inductance in the barrier.
The maximum allowable capacitance and inductance in the connected circuit.
The minimum allowable capacitance and inductance in the connected circuit.
What does Ui, Ii and Pi on a certified pressure transmitter describe?
The maximum voltage, current and power for the loop it may be used in.
The minimum operational voltage, current and power.
The Ui, Ii and Pi are typical values for barriers, not field apparatus like pressure transmitters.
What does the ATEX code II(1)G, and EPL (Ga) on a certificate label mean?
Associated apparatus that can feed into Zone 0.
Device that can be located in Zone 0.
Not a valid marking.
What does the Uo, Io and Po represent?
The maximum input parameters to a field device.
The maximum voltage, current and power the barrier can be supplied with from E. g. a PLC.
The maximum output parameters from a barrier.
What is the Um value on a barrier?
The maximum voltage where the IS circuit is still protected.
The maximum nominal Voltage.
The maximum output Voltage from the barrier.
What is the main purpose of a galvanic isolator?
Convert the signal from the field device.
Ensure proper earth continuity.
Limit the energy in an IS circuit.
What is the maximum impedance from the IS earth bar in a control cabinet with Zener barriers back to the power systems earth?
Max 1Ω.
Max 10Ω.
No maximum value shall be minimum 1Ω.
What is the minimum clearance distance between IS circuits and Non-IS circuits?
3 mm.
6 mm.
20 mm.
50 mm.
What is the minimum creepage distance between the metal of terminals on two separate IS circuits?
3 mm.
6 mm.
20 mm.
50 mm.
What is the minimum creepage distance between the metal of a terminal on an IS loop and earth?
3 mm.
6 mm.
20 mm.
50 mm.
What is the minimum requirements for cross-section for the IS earth back to the power systems earth?
One 4 mm2 or two separate 1,5 mm2.
One 16 mm2 or two separate 10 mm2.
One 6 mm2 or two separate 4 mm2.
What limits the energy in an IS circuit?
The cable.
The field device.
The associated apparatus.
Which of the concepts offers the highest level of protection?
Ex «ia».
Ex «ib».
Ex «ic».
Ex «nl».
Will the cable type and length affect an IS loop?
Yes, both with capacitance and inductance.
No, this is classified as a simple apparatus.
Only in an IS loop intended for IIC gas environment.
You have a label with following information: II 3(1)G Ex nA [ia] IIB T4 Gc (Ga). Into which zone can the equipment be installed?
Zone 0, and feed into Zone 2 only.
Zone 2, and feed into Zone 0.
Zone 2, and feed into Zone 1 and 2 only.
You have a label with the following information: II 2(1)G Ex d [ia] IIB T6 Gb (Ga). What does the concept codes Ex d [ia] represent?
This is an assembly with an Ex d enclosure and there is an associated apparatus for Ex «ia» circuits inside.
The equipment must be supplied by an Ex «ia» circuit.
The «clamps» on the [ia] indicates that this is only component certified.

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