EXIN CDCS New Dumps Free & CDCS Examcollection
EXIN CDCS New Dumps Free & CDCS Examcollection
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EXIN CDCS Exam Syllabus Topics:
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EXIN EPI Certified Data Centre Specialist Sample Questions (Q19-Q24):
NEW QUESTION # 19
What is the calculation for the desired attenuation factor for shielding material?
- A. A = 20 log (R / M)
Where A is Attenuation R is the real value measured M is the maximum acceptable value - B. A = M / R
Where A is Attenuation M is the maximum acceptable value R is the real value measured - C. A = 20 log (M / R)
Where A is Attenuation M is the maximum acceptable value R is the real value measured - D. You do not have to calculate the attenuation factor for shielding material as it always has the same attenuation
Answer: A
Explanation:
The attenuation factor for shielding material is typically calculated using the formula A = 20 log (R / M). This equation provides the attenuation in decibels (dB), where R represents the measured electromagnetic field strength, and M is the maximum acceptable level. The logarithmic scale helps quantify how much the shielding reduces EMF levels relative to the maximum allowable value.
Detailed Explanation:
This formula calculates attenuation by comparing the measured value with the acceptable threshold, with the result expressed in decibels. A higher attenuation indicates more effective shielding material, essential for environments requiring robust EMF management.
EPI Data Center Specialist References:
EPI standards include the use of logarithmic formulas to evaluate attenuation levels, ensuring that shielding materials provide adequate reduction in EMF to protect sensitive equipment within data centers.
NEW QUESTION # 20
What is a potential disadvantage of using a hypoxic-based fire suppression system as a fire extinguishing system?
- A. It can only be used in computer rooms which have sufficient air changes per hour.
- B. The gas containers need to be close to the hazard area.
- C. It can only be used in non-continuous occupied areas.
- D. It can only be used in computer rooms where you have sufficient positive pressure.
Answer: C
Explanation:
A hypoxic-based fire suppression system works by reducing the oxygen level in a room to below what is necessary to sustain combustion. This makes it effective in fire prevention, but it is not suitable for continuous occupancy by personnel. Low oxygen levels can cause discomfort or even health risks for people spending extended periods in the space. Therefore, these systems are typically deployed in areas where continuous human occupancy is not required, such as storage rooms or data halls with limited personnel access.
Detailed Explanation:
Hypoxic fire suppression systems lower oxygen levels to around 15-16%, which is safe for short periods but not sustainable for continuous occupancy without risk to health. Data center environments where staff need to spend long periods monitoring and maintaining equipment would need alternative systems, like gas-based suppression that allows for safe evacuation rather than oxygen reduction.
EPI Data Center Specialist References:
The EPI Data Center Specialist curriculum emphasizes that fire suppression systems must be chosen based on occupancy requirements. Hypoxic systems are specifically noted as unsuitable for spaces requiring continuous human presence due to the low oxygen environment they create.
NEW QUESTION # 21
What precaution shall be taken for cabling leading into an equipment rack when a data center is in a seismic-prone area?
- A. Cables can be organized in any way as it is not important.
- B. Cables shall be tightly organized to the rack and trays to avoid movement.
- C. Cables should be loosely organized to allow for movement and be latched at the connectors.
- D. Cables should be replaced by busbar trunking.
Answer: B
Explanation:
In seismic-prone areas, cables should be tightly secured to racks and cable trays to minimize movement during seismic activity. Properly securing the cables prevents them from being damaged due to excessive motion, which could lead to outages or damage to connected equipment.
Detailed Explanation:
Loose cables can be vulnerable to shaking or sudden jolts during an earthquake, increasing the risk of disconnection or damage. By tightly organizing and securing cables, you ensure they remain in place, even during significant movement, thereby maintaining connection integrity and reducing the risk of physical damage.
EPI Data Center Specialist References:
EPI training includes considerations for data centers in seismic zones, advising that cables be firmly anchored to support structures to reduce movement and mitigate potential damage during seismic events.
NEW QUESTION # 22
You are changing the design of the fire suppression system for your computer room from a halocarbon fire suppression system into an inert-based fire suppression system. Could you use the same formula to calculate the gas content for the gas?
- A. Yes, as long as you use the same units of measure, i.e., kg/m³ or lbs/ft³.
- B. Yes, as long as you take the difference between the net and gross volume into account.
- C. No, there is a significant difference in the formula for the different types of fire suppression gases.
- D. Yes, as long as you change the 'S' factor of the formula to reflect the gas type used.
Answer: C
Explanation:
The formula used to calculate the gas content differs significantly between halocarbon and inert-based fire suppression systems. Halocarbon systems function by absorbing heat, while inert systems work by reducing oxygen levels. Due to these differences in fire suppression mechanisms, distinct formulas are applied, factoring in the specific properties of each gas type and the required concentration levels.
Detailed Explanation:
Halocarbon systems like FM200 require a formula that accounts for the concentration needed for cooling, while inert gases like nitrogen or argon need a formula that calculates the volume based on oxygen displacement. As the design concentration and characteristics of these gases differ, it's essential to use the correct formula specific to the gas type.
EPI Data Center Specialist References:
EPI recommends consulting the specific design requirements and formulas provided by each gas manufacturer when switching fire suppression systems to ensure the correct amount of gas is deployed for effective fire suppression.
NEW QUESTION # 23
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?
- A. Approximately 1,390 kg / 3,000 lbs
- B. Approximately 410 kg / 900 lbs
- C. Approximately 1,640 kg / 3,600 lbs
- D. Approximately 820 kg / 1,800 lbs
Answer: D
Explanation:
The amount of FM200 gas required can be calculated using the formula:
Weight of Gas=Net Volume×Design Concentration×S-Factortext{Weight of Gas} = text{Net Volume} times text{Design Concentration} times text{S-Factor}Weight of Gas=Net Volume×Design Concentration×S-Factor Using metric units:
Net Volume: 2,500 m³
Design Concentration: 7% (or 0.07)
S-Factor: 0.1359
Calculation:
2,500 m3×0.07×0.1359=821.325 kg2,500 , text{m}