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Online CDCS Test | New CDCS Exam Pattern

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EXIN CDCS Exam Syllabus Topics:

Topic
Details

Topic 1

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 2

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 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.

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EXIN EPI Certified Data Centre Specialist Sample Questions (Q111-Q116):

NEW QUESTION # 111
Where should raised-floor installation start?

A. Point A (entrance corner)
B. Point C (center of the room)
C. Point D (corner opposite entrance)
D. Point B (side wall)

Answer: B

Explanation:
Best practice is to begin raised-floor installation at the center of the room, working outward. This minimizes alignment errors and ensures the tile grid is centered, which is critical for aisle containment and rack alignment.
Starting at the perimeter (A, B, D) causes cutting of tiles along both sides, misalignment with rack rows, and possible airflow inefficiencies. By starting at the center, tiles can be cut symmetrically around the edges, providing better aesthetics, balanced airflow, and structural stability.
Industry guidelines such as CISCA recommend this approach for raised floors in mission-critical spaces.
References: CISCA Raised Access Floor Guidelines, ANSI/TIA-942-B §6.3.

NEW QUESTION # 112
An MCB needs to be installed in the PDU of an ICT rack. Which breaking curve should you select?

A. C-Curve
B. A-Curve
C. D-Curve
D. B-Curve

Answer: A

Explanation:
MCBs (Miniature Circuit Breakers) are characterized by their tripping curves:
* B-Curve: Trips at 3-5 × rated current; suitable for resistive loads.
* C-Curve: Trips at 5-10 × rated current; suitable for mixed loads including ICT equipment with moderate inrush current.
* D-Curve: Trips at 10-20 × rated current; used for heavy inductive loads like motors.
* A-Curve: Very sensitive, rarely used outside specialty electronics.
Since ICT equipment like servers and network devices have moderate inrush currents (from power supplies), the recommended breaker is C-Curve. It balances protection against nuisance tripping while still ensuring fault clearance.
References: IEC 60898-1 (Circuit Breakers for Overcurrent Protection), IEC 60947-2 (LV Breakers), EXIN DCS study material: Electrical Distribution.

NEW QUESTION # 113
What indicates the overcurrent of a fuse or breaker?

A. The current at which the device will trip
B. The current that a fuse or breaker is able to interrupt without being destroyed or causing an electrically damaging arc
C. The maximum inrush current an overcurrent protection device can handle within a defined period of time
D. The maximum electrical current which can flow in a particular electrical system under short-circuit conditions; it is determined by the voltage and impedance of the supply system

Answer: A

Explanation:
"Overcurrent" for protective devices is the condition above the device's rated/trip value that causes operation (tripping/melting).
* A = inrush tolerance, not the definition of overcurrent.
* B = prospective short-circuit current (Ik).
References: IEC 60947-2 (LV circuit breakers, defs 2.5.13 Overcurrent; 2.3.3 Rated short-circuit breaking capacity), IEC 60269 (fuses).

NEW QUESTION # 114
A data center has its own power supply from the public utility and receives chilled water supply from the building owner.
What needs to be taken into consideration when calculating the PUE?

A. Nothing, as the chiller plant in the building also uses electrical power
B. You will need to take the value for COP of the chiller plant into consideration
C. PUE calculations are not possible in shared buildings
D. You will need to take a weight factor of 0.4 for district chilled water into consideration

Answer: D

Explanation:
When calculating Power Usage Effectiveness (PUE) in a data center that uses chilled water from an external source, like from a building owner, a weight factor for district chilled water must be applied. This is because PUE calculations aim to measure the energy efficiency of the data center's own operations, and external utilities like district chilled water aren't directly powered by the data center. A weight factor of 0.4 is typically used to account for the energy consumed to produce and deliver the chilled water, reflecting the indirect impact on the data center's total energy consumption.
Detailed Explanation:
PUE is calculated as the ratio of the total facility energy to the IT equipment energy. If the cooling is provided by an external chilled water source, it's necessary to adjust the calculations to accurately reflect the energy impact. By incorporating the 0.4 weight factor, data centers can calculate a more accurate PUE, aligning with standard methods and industry best practices.
EPI Data Center Specialist References:
EPI training on PUE highlights the importance of adjusting for external energy sources, such as district cooling, in the calculations. This ensures that PUE values remain accurate and comparable across different data centers, even when external utilities are used.

NEW QUESTION # 115
EMF shielding material needs to be installed as EMF levels from the transformer room into the computer room are measured at 100 mG. The transformer room is ~10 meters away, separated by a corridor. Where should shielding be installed?

A. As close as possible to the transformer room
B. As close as possible to the computer room
C. It does not matter; either close to the transformer room or computer room is okay
D. Shielding is not required as 100 mG is within acceptable levels

Answer: A

Explanation:
The most effective EMF mitigation is to install shielding as close as possible to the source of radiation. By blocking or redirecting magnetic flux at the origin (the transformer room walls), the overall field propagation into adjacent areas is minimized. If shielding were placed at the computer room, the field would already have spread over the intervening space, requiring more material and higher cost.
Standards such as IEEE Std 299 (EMC Shielding Effectiveness) and IEC 61000 emphasize source-based mitigation. Additionally, ANSI/TIA-942 requires EMF shielding where magnetic flux exceeds recommended ICT thresholds (generally <5 mG for sensitive tape/disk storage).
Although 100 mG is often tolerated by modern equipment, legacy magnetic storage can be affected, so shielding is still prudent. Hence, the correct location is at the transformer room wall.
References: IEEE Std 299 (EMI Shielding), ANSI/TIA-942-B §6.6.4 (EMF Requirements), IEC 61000 EMC standards.

NEW QUESTION # 116
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