CDCS Best Vce, CDCS Exam Duration

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These EXIN CDCS exam practice questions will greatly help you to prepare well for the final CDCS certification exam. EXIN CDCS exam preparation and boost your confidence to pass the CDCS Exam. All EXIN CDCS exam practice test questions contain the real and updated EXIN CDCS exam practice test questions.

EXIN EPI Certified Data Centre Specialist Sample Questions (Q48-Q53):

NEW QUESTION # 48
Which class of UPS is ideal for data centers?

Answer: D

Explanation:
IEC 62040 defines UPS topologies:
* VFD: Line-interactive; dependent on mains.
* VI: Stabilizes voltage but not frequency.
* VFI: Double-conversion online; fully isolates output from mains fluctuations.
Data centers require continuous, clean, and stable power. VFI is the only topology that protects against both voltage and frequency disturbances, meeting ANSI/TIA-942 Rated-3/4 requirements.
Thus, VFI is the ideal UPS class.
References: IEC 62040-3, ANSI/TIA-942-B §6.2.


NEW QUESTION # 49
What is the effect of having a damper (in open position) construction in a raised-floor tile?

Answer: D

Explanation:
Perforated tiles with integrated dampers are common in raised-floor data centers because they allow airflow regulation at the rack level. However, even when the damper is fully open, the mechanism inside the tile restricts airflow. This typically reduces the delivered airflow by around 10% compared to a non-dampered tile of the same type.
* Option A is incorrect because dampers do not affect supply temperature; they only throttle volume.
* Option B is wrong since dampers cannot increase volume-they only add resistance.
* Option D is partially true that dampers help with temperature balancing, but the main effect (in open position) is volume reduction.
Thus, the technical impact of dampers in open position is a slight airflow reduction, usually quantified as
~10%.
References: ASHRAE TC 9.9 - "Airflow Management in Raised-Floor Environments," ANSI/TIA-942-B §6.
5 (Cooling Infrastructure).


NEW QUESTION # 50
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?

Answer: D


NEW QUESTION # 51
An air-conditioner unit needs to be selected. Two types are available:
Unit-A has a Sensible Heat Ratio (SHR) of 0.7.
Unit-B has a Sensible Heat Ratio (SHR) of 0.9.
From an efficiency point of view, which one should be selected?

Answer: D

Explanation:
From an efficiency standpoint, Unit B with a Sensible Heat Ratio (SHR) of 0.9 is preferable. A higher SHR indicates that a greater proportion of the air conditioner's capacity is dedicated to sensible cooling (temperature reduction) rather than latent cooling (moisture removal). In data centers, sensible cooling is more critical since IT equipment primarily generates heat without adding significant moisture.
Detailed Explanation:
An SHR of 0.9 means that 90% of the cooling capacity is used for sensible cooling, which is more efficient for environments like data centers where humidity control is typically less of a concern. Opting for an air conditioner with a higher SHR ensures that most of the cooling energy is focused on temperature reduction, making Unit B more efficient in this scenario.
EPI Data Center Specialist References:
EPI data center best practices recommend choosing cooling units with higher SHR values in data centers, as they better match the cooling needs of IT equipment. High SHR units improve cooling efficiency by concentrating on sensible heat removal, which is vital for maintaining the optimal thermal environment.


NEW QUESTION # 52
ICT rack consumes 3 kW with #T ~11 °C (20 °F). Calculate required airflow (CFM).

Answer: A

Explanation:
Cooling airflow (CFM) can be calculated from:
Where P = IT load.
So approximately 500 CFM is required.
* 1,500 and 1,000 CFM are too high.
* 160 CFM is far too low.
Therefore, the correct answer is ~500 CFM.
References: ASHRAE TC 9.9 (Cooling Calculations), ANSI/TIA-942-B §6.5.


NEW QUESTION # 53
......

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