Give Push to your Success with EPI Data Centre CDCS Exam Questions [Q11-Q29]

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Give Push to your Success with EPI Data Centre CDCS Exam Questions

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Q11. What is the minimum requirement for the power feeds to the building for a Rated-3 data center based on the ANSI/TIA-942 standard?

Two feeds coming from two different substations, one power company is not acceptable

Two feeds coming from two different substations, one power company is acceptable

Two feeds entering the data center building from one substation

One feed from one substation split over two separated distribution boards in separate rooms

Q12. What indicates the breaking capacity of a fuse or breaker?

Mechanical strength of the casing of a fuse or breaker.

The maximum voltage, in case of an electrical surge, that the fuse or breaker can handle without being destroyed or causing an electric damaging arc.

The current at which the device will trip.

The current that a fuse or breaker is able to interrupt without being destroyed or causing an electric damaging arc.

Q13. What is the main disadvantage of using a ToR (Top of Rack) design?

A single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch.

You need a separate rack to install all your ToR (Top of Rack) switches.

There will be more switches to manage.

A ToR (Top of Rack) switch has only optical interfaces.

Q14. The electrical diagram of the data center shows the following UPS configuration and has a load of 80 kW.
What is the set-up in this data center?

2+N+1

2(N+1)

N+N(+1)

(N+1)-(N+1)

Q15. A computer room needs to be fitted out with a gas-based fire suppression system. The computer room will be a high-density data center with about 30% of the racks being closed circuit cooling blade-center racks.
Should the supplier of the fire suppression system be informed on the design of the racks?

No, cooling and design of racks have no influence on the fire suppression system design.

Only when the rack height obstructs a potential fire suppression release point.

Yes, the design of the racks has an influence on the fire suppression system design.

Only when the racks might block access to the fire panel.

Q16. The computer room has high levels of H2S gas contamination. What is the best option to resolve this issue?

Vacuum the whole room using a HEPA/S-Class-based filter.

Install air-scrubbers.

Clean the room and racks with a damp/wet cloth.

Provide more air changes per hour by adding more fresh air to the computer room.

Q17. You are installing new copper cabling.
What is the advantage or disadvantage of choosing pre-terminated category 6 or 6A cabling?

Pre-terminated cabling is already factory tested and saves installation time.

There is no advantage as most new copper cabling network designs are based on category 3 or 5E for horizontal cabling.

Pre-terminated cabling has a higher fire rating.

Pre-terminated cabling makes ordering of the copper cables more complex, as you need to know in advance on which side the male or female connector needs to be located.

Q18. What is the advantage or disadvantage of using MPO (Multi-fiber Push On)/pre-terminated fiber?

There is no advantage, as it cannot be used with OM4 optical fiber cables.

There is no advantage, as it creates additional heat load in the data center.

It speeds up installation and provides an easy upgrade to transmission speeds up to 40 Gbit/s -100 Gbit/s.

It is a very flexible system as it can be used for both copper cables and optical fiber cables.

Q19. What precaution shall be taken for cabling leading into an equipment rack when a data center is in a seismic-prone area?

Cables should be loosely organized to allow for movement and be latched at the connectors.

Cables shall be tightly organized to the rack and trays to avoid movement.

Cables can be organized in any way as it is not important.

Cables should be replaced by busbar trunking.

Q20. A new network storage device in a non-standard size rack of approximately 600 kg/1,300 lbs is going to be installed in the data center.
Are new floor loading calculations required?

No, as long as the equipment is less than 700 kg/1,500 lbs it will be within the limits.

No, specifications of equipment brought into the data center will already be known during the design of the data center, and therefore the floor will be able to handle it.

Yes, additional floor loading calculations need to be done by the floor manager, which should be verified by the safety engineer.

Yes, a structural engineer, approved/endorsed by the building owner, should carry out new floor loading calculations.

Q21. Do you need to consider bullet (ballistics) protection when designing a data center?

Bullet (ballistics) protection is required by ANSI/TIA-942 for all data centers.

Bullet (ballistics) protection is only required when the data center is located in an area with a high crime rate.

Bullet (ballistics) protection is required by ANSI/TIA-942 for data centers Rated 3/4.

Bullet (ballistics) protection is only required if the facility is a potential target or the building is in the vicinity of a potential target.

Q22. When installing a raised floor, can we use a spirit level bar to level the floor?

Yes, spirit level bars can be used as long as their length is longer than 60 cm/2 ft (the size of a typical raised floor tile).

No, because using a spirit level bar, a measurement error will be transferred from pedestal to pedestal.

Yes, but spirit level bars can only be used in the vertical plane.

Yes, using a spirit level bar for raised floors higher than 40 cm is preferred.

Q23. Three data centers are benchmarked on facilities energy efficiency.
Data center A has achieved a PUE of 2.45.
Data center B has achieved a PUE of 1.20.
Data center C has achieved a PUE of 1.90.
Which of the data centers is operating at the highest facility efficiency?

PUE does not indicate efficiency

Data center A

Data center B

Data center C

Q24. You are allowed to use a calculator for this question. A battery bank is rated at a total capacity of 600 Ah. Calculate how much charging current the rectifier should be able to supply as charging current.

12 Amperes

30 Amperes

60 Amperes

80 Amperes

Q25. Management has requested a 15-minute battery bank assuming full load on the UPS. The UPS vendor has provided the following specifications of the UPS:
* Rated power: 30 kVA
* Rectifier input voltage: 400 V/3 phase
* Rectifier input power factor: 0.8
* Battery rated voltage: 384 V
* Number of cells: 192
* End of discharge voltage: 308 V
* Inverter output voltage: 400 V/3 phase
* Inverter output power factor: 0.8
What information is missing to perform the battery calculation?

UPS efficiency

Inverter efficiency

Load imbalance on the phases

Available battery charging current

Q26. You are allowed to use a calculator for this question.
A computer room has a net volume of approximately 2,500 m³ / 88,287 ft³.
The temperature is 20 °C / 68 °F.
The required design concentration is 7%.
The S-Factor is 0.1359 (metric) / 1.885 (imperial).
Calculate the amount of gas required for this computer room based on FM200. What is the correct weight?

Approximately 410 kg / 900 lbs

Approximately 820 kg / 1,800 lbs

Approximately 1,390 kg / 3,000 lbs

Approximately 1,640 kg / 3,600 lbs

Q27. The building in which the computer room is housed is required to have a sprinkler system. The building is therefore equipped with a wet pipe system.
What action, if any, should you recommend for the computer room?

Maintain the current wet pipe system.

Replace the wet pipe system with a deluge system.

Replace the wet pipe system with a dry pipe system.

Replace the wet pipe system with a pre-action system.

Q28. In order to save energy, you are going to install an automated system to switch off lights. What should be taken into consideration when installing such a system?

It is not advisable to use such a system since it will reduce the lifetime of LED lighting.

At all times, the levels should allow for security cameras to function properly.

The system should not be based on motion detection as the lights might suddenly switch off while staff is still at work.

Security guards should perform regular inspections verifying the system works.

Q29. What is the calculation for the desired attenuation factor for shielding material?

A = 20 log (M / R)
Where A is Attenuation M is the maximum acceptable value R is the real value measured

A = M / R
Where A is Attenuation M is the maximum acceptable value R is the real value measured

A = 20 log (R / M)
Where A is Attenuation R is the real value measured M is the maximum acceptable value

You do not have to calculate the attenuation factor for shielding material as it always has the same attenuation

EXIN CDCS Exam Syllabus Topics:

Topic	Details
Topic 1	Designing and Implementing a Data Centre: In this module, the exam assesses the knowledge of Exin data center professionals tasked with the design and implementation of data centers. Candidates will learn the key principles of creating an efficient data center layout, including considerations for scalability, redundancy, and security.
Topic 2	Data Centre Environmental Considerations and Efficiency: This section evaluates the proficiency of data center professionals in addressing environmental factors and promoting efficiency within data center operations. The target audience, including data center managers and engineers, will be tested on their ability to identify and implement measures that enhance energy efficiency, cooling management, and sustainable practices.
Topic 3	Data Centre Life Cycle and Standards: This section of the exam measures the skills of data center professionals and covers the various stages involved in the life cycle of a data center, from planning and design to implementation and decommissioning.