CDCS LATEST TEST SIMULATIONS - SIMULATED CDCS TEST

CDCS Latest Test Simulations - Simulated CDCS Test

CDCS Latest Test Simulations - Simulated CDCS Test

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Tags: CDCS Latest Test Simulations, Simulated CDCS Test, CDCS Testking, Unlimited CDCS Exam Practice, CDCS Exams Training

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EXIN EPI Certified Data Centre Specialist Sample Questions (Q10-Q15):

NEW QUESTION # 10
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. PUE calculations are not possible in shared buildings
  • B. Nothing, as the chiller plant in the building also uses electrical power
  • C. You will need to take a weight factor of 0.4 for district chilled water into consideration
  • D. You will need to take the value for COP of the chiller plant into consideration

Answer: C

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 # 11
The computer room has high levels of H2S gas contamination. What is the best option to resolve this issue?

  • A. Install air-scrubbers.
  • B. Clean the room and racks with a damp/wet cloth.
  • C. Provide more air changes per hour by adding more fresh air to the computer room.
  • D. Vacuum the whole room using a HEPA/S-Class-based filter.

Answer: A

Explanation:
High levels of H2S (hydrogen sulfide) gas contamination in a computer room are best addressed by installing air-scrubbers. Air-scrubbers can effectively filter out contaminants, including corrosive gases like H2S, ensuring clean air circulation and protecting sensitive IT equipment from potential corrosion and damage.
Detailed Explanation:
Air-scrubbers are designed to remove various airborne contaminants and are particularly useful in environments where corrosive gases are present. These systems use filters or chemical reactions to neutralize harmful substances, making them ideal for data centers that need to maintain high air quality for equipment reliability.
EPI Data Center Specialist References:
EPI guidelines suggest air-scrubbing technologies to remove contaminants that pose risks to electronic equipment, maintaining air quality and reducing corrosion risk.


NEW QUESTION # 12
An MCB needs to be installed in the PDU of an air-conditioner unit.
Which breaking curve should you select?

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

Answer: A

Explanation:
For an MCB (Miniature Circuit Breaker) in the PDU of an air-conditioning unit, a C-Curve is recommended. C-Curve breakers are suitable for circuits with moderate inrush currents, such as those experienced in air conditioning units. They provide protection against overloads while accommodating the inrush without nuisance tripping.
Detailed Explanation:
C-Curve breakers trip when currents exceed 5 to 10 times the rated current, making them ideal for devices like air conditioners that experience moderate inrush currents upon startup. This characteristic provides a balance between protection and resilience against startup surges, preventing unnecessary trips while safeguarding the circuit.
EPI Data Center Specialist References:
EPI guidance for data center electrical systems specifies that C-Curve breakers are appropriate for equipment with inrush characteristics similar to air conditioning units, as they help prevent operational interruptions caused by typical surges during equipment start-up.


NEW QUESTION # 13
The temperature in the computer room is being increased from 18°C/64°F to 27°C/81°F.
What is the impact, if any, on the amount of gas required to suppress a fire assuming the gas is a Halocarbon?

  • A. The amount of gas required will be lower
  • B. The amount of gas required will be higher
  • C. The change to the amount of gas cannot be determined without knowing the change in humidity as well
  • D. The amount of gas required will not change

Answer: A

Explanation:
With Halocarbon fire suppression systems, as the temperature increases, the amount of gas required for effective suppression decreases. This is because Halocarbon agents are stored as a liquid and discharge as a gas, expanding more at higher temperatures. As a result, less agent is needed at higher room temperatures to achieve the desired concentration for fire suppression.
Detailed Explanation:
Halocarbons rely on specific volumetric concentrations to suppress fires. Higher temperatures cause the agent to expand more rapidly, effectively filling the protected area with less agent needed to reach the required concentration. This is in contrast to some other gases, where temperature changes might not have the same effect on discharge quantities.
EPI Data Center Specialist References:
EPI data center training on fire suppression indicates that understanding the physical properties of agents like Halocarbons is key for correct system sizing. As the temperature rises, the gas expands more readily, thus requiring adjustments in the amount needed for effective coverage.


NEW QUESTION # 14
What is a potential disadvantage of using water mist as a fire extinguishing system?

  • A. It has droplets that are too small (100-120 microns) so it can only be used for small fires
  • B. It extracts oxygen from the air creating a potential risk for humans inside the computer room
  • C. It will rapidly increase the humidity level in the data center, which can cause a potential risk for the operation of the equipment
  • D. It only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire

Answer: C

Explanation:
A potential disadvantage of using a water mist fire suppression system is that it can rapidly increase the humidity within the data center, which may pose risks to sensitive electronic equipment. Excessive humidity can lead to condensation, which could damage electronics and lead to short circuits or corrosion over time.
Detailed Explanation:
Water mist systems use fine droplets to suppress fires by cooling and displacing heat. However, the moisture generated may raise the humidity level to the point where it exceeds safe operational limits for IT equipment. Therefore, while water mist systems are effective in fire suppression, they may not be ideal in environments where high humidity could damage sensitive equipment.
EPI Data Center Specialist References:
EPI guidelines advise considering the impact of humidity from fire suppression systems, particularly in environments housing electronic equipment. It's essential to weigh the benefits of fire suppression against potential risks to operational equipment when choosing suppression methods.


NEW QUESTION # 15
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