CDCS

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The dumps for CDCS exam was last updated on Oct 06,2025 .

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Question#1

What is needed to determine the Relative Humidity (RH)?

A. Wet bulb temperature, local atmospheric pressure, and calculator

B. Dry bulb temperature, airflow, and conversion table

C. Cold surface with dew collection counter

D. Dry bulb temperature, wet bulb temperature, and psychrometric chart

Explanation:
Relative Humidity (RH) is defined as the ratio of the actual water vapor content in the air to the maximum possible water vapor content at a given temperature. To calculate RH: Dry bulb temperature (DBT): the ambient air temperature.
Wet bulb temperature (WBT): the temperature measured by a thermometer covered with a wet wick, influenced by evaporative cooling.
Using DBT and WBT, the humidity ratio and dew point can be determined with a psychrometric chart or Mollier diagram.
From there, RH is calculated as:

Options A and B are incomplete, while option C is an experimental method, not standard practice.
The recognized method is option D.
Reference: ASHRAE Fundamentals Handbook C Psychrometrics, ISO 7726 (Measurement of Physical Quantities in Thermal Environments).

Question#2

You need to determine the strategy for the cooling audit. All the servers are based on a front-to-rear (F-R) airflow design.
Which location for the temperature/humidity measurement should you recommend for the audit?

A. At the back/rear of the server at 50 mm/2 inch

B. At 1.5 meters/5 feet above the floor in the middle of the cold aisle

C. At the front/intake of the server at 50 mm/2 inch

D. At 1.5 meters/5 feet above the floor in the middle of the hot aisle

Explanation:
For a cooling audit in a data center, it is essential to measure temperature and humidity where air enters the servers to accurately assess cooling performance. In this case, since all servers have a front-to-rear (F-R) airflow design, measuring at the front/intake of the server will provide a precise understanding of the cooling conditions that the equipment is experiencing.
Detailed Explanation
Servers with a front-to-rear airflow design draw in cool air from the cold aisle at the front, which is then exhausted into the hot aisle at the rear. By measuring temperature and humidity 50 mm/2 inches from the front intake, you gather data on the air conditions right before it enters the servers, providing an accurate representation of the cooling environment as it directly impacts the equipment.
Measuring in the cold aisle at the front intake ensures that the readings reflect the actual conditions of the incoming air that the servers depend on for effective cooling. This approach is consistent with best practices for maintaining thermal conditions in a data center, as it helps confirm that the cooling systems are delivering air within the required temperature and humidity specifications.
EPI Data Center Specialist
Reference: According to the EPI Data Center Specialist curriculum, the optimal placement for temperature and humidity sensors is at the intake of the equipment in the cold aisle, as it directly correlates to the environmental conditions affecting the servers. This positioning allows for a more effective audit of cooling performance, which is critical for maintaining the reliability and efficiency of the data center’s operations.

Question#3

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.

A. 12 Amperes

B. 30 Amperes

C. 60 Amperes

D. 80 Amperes

Explanation:
To determine the charging current for a battery bank, a general rule of thumb is that the charging current should be 5% of the total battery capacity.
For a battery rated at 600 Ah, this calculation would be:
600 Ah×0.05=30 Amperes600 \, \text{Ah} \times 0.05 = 30 \, \text{Amperes}600Ah×0.05=30Amperes This ensures the battery is charged efficiently without overloading the rectifier or risking battery damage.
Detailed Explanation
Battery charging current is typically set as a percentage of the battery's capacity to balance effective charging with longevity and safety. A 5% charging rate is standard for lead-acid batteries, which would be 30 Amperes for a 600 Ah battery bank.
EPI Data Center Specialist
Reference: EPI standards recommend calculating charging currents based on a percentage of the battery capacity to ensure safety and efficiency, aligning with best practices for battery management in data centers.

Question#4

You have three UPS systems connected in parallel. The UPS systems have an imbalance in the load
sharing of approximately 20%.
What should you recommend?

A. Review the cable lengths of each UPS to the common busbar

B. Nothing, there is no reason for any concern

C. Review the common mode noise levels within the computer room

D. Review the harmonics levels within the computer room

Explanation:
An imbalance in load sharing between UPS systems connected in parallel can often result from unequal cable lengths to the common busbar. If the cabling from each UPS to the busbar varies significantly in length, it can lead to differences in impedance, resulting in uneven load distribution. Ensuring that cable lengths are consistent helps to balance the load sharing across the UPS systems.
Detailed Explanation
Parallel UPS systems rely on uniform impedance to share loads evenly. Differences in cable lengths cause variations in resistance, leading to one or more UPS units carrying a disproportionate share of the load. Standardizing cable lengths ensures equal impedance, which promotes balanced load sharing and prevents one UPS from being overburdened, thus maintaining overall system reliability.
EPI Data Center Specialist
Reference: EPI guidelines recommend checking cable lengths when load imbalances occur in parallel UPS configurations. Ensuring equal lengths is a common method to resolve impedance issues that affect load distribution, which is critical for the stable operation of redundant power systems.

Question#5

Do you need to consider bullet (ballistic) protection when designing a data center?

A. No; bullet protection is not a requirement of ANSI/TIA-942

B. No, there is no reason for implementing bullet protection as you cannot predict the type of weapons that might be used

C. Yes, but only when the data center is built in an area with a high criminality rate or with a risk of terrorist attacks

D. Yes, bullet protection is a requirement of ANSI/TIA-942 for Rated-3/4 data centers

Explanation:
ANSI/TIA-942 requires a risk assessmentCbased approach to physical security; ballistic protection is not mandated but may be justified by threat analysis. A is incomplete (it may still be required by risk).
D is false.
Reference: ANSI/TIA-942-B §6.4 Physical Security (threat/risk assessment), ISO 31000 (risk management).

Exam Code: CDCS Q & A: 120 Q&As Updated: Oct 06,2025

Full CDCS Exam Dumps Here

Exam Code: CDCS
Q & A: 120 Q&As
Updated: Oct 06,2025

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