Our team of highly skilled and experienced professionals is dedicated to delivering up-to-date and precise study materials in PDF format to our customers. We deeply value both your time and financial investment, and we have spared no effort to provide you with the highest quality work. We ensure that our students consistently achieve a score of more than 95% in the Exin CDCS exam. You provide only authentic and reliable study material. Our team of professionals is always working very keenly to keep the material updated. Hence, they communicate to the students quickly if there is any change in the CDCS dumps file. The Exin CDCS exam question answers and CDCS dumps we offer are as genuine as studying the actual exam content.
24/7 Friendly Approach:
You can reach out to our agents at any time for guidance; we are available 24/7. Our agent will provide you information you need; you can ask them any questions you have. We are here to provide you with a complete study material file you need to pass your CDCS exam with extraordinary marks.
Quality Exam Dumps for Exin CDCS:
Pass4surexams provide trusted study material. If you want to meet a sweeping success in your exam you must sign up for the complete preparation at Pass4surexams and we will provide you with such genuine material that will help you succeed with distinction. Our experts work tirelessly for our customers, ensuring a seamless journey to passing the Exin CDCS exam on the first attempt. We have already helped a lot of students to ace IT certification exams with our genuine CDCS Exam Question Answers. Don't wait and join us today to collect your favorite certification exam study material and get your dream job quickly.
90 Days Free Updates for Exin CDCS Exam Question Answers and Dumps:
Enroll with confidence at Pass4surexams, and not only will you access our comprehensive Exin CDCS exam question answers and dumps, but you will also benefit from a remarkable offer – 90 days of free updates. In the dynamic landscape of certification exams, our commitment to your success doesn't waver. If there are any changes or updates to the Exin CDCS exam content during the 90-day period, rest assured that our team will promptly notify you and provide the latest study materials, ensuring you are thoroughly prepared for success in your exam."
Exin CDCS Real Exam Questions:
Quality is the heart of our service that's why we offer our students real exam questions with 100% passing assurance in the first attempt. Our CDCS dumps PDF have been carved by the experienced experts exactly on the model of real exam question answers in which you are going to appear to get your certification.
Exin CDCS Sample Questions
Question # 1
The logical overview of the data center looks as pictured. To what TIA-942 Rating is this design made
based on electrical only?
A. Rating - 4 B. Rating - 3 C. Rating - 2 D. Rating - 1
Answer: A
Explanation:The electrical design shown in the diagrams represents a TIA-942 Rating-4 configuration. This designincludes full redundancy and fault tolerance, as demonstrated by the dual power distribution pathsfrom the utility supply to the critical loads. Each power distribution path is equipped with its ownUPS, ensuring that the ICT equipment and mechanical equipment have uninterrupted power in caseof any single point of failure.DetailedExplanation:A Rating-4 data center requires two independent power paths that are fully redundant and capableof supporting the load independently. In the diagrams:There are dual feeds from the utility supply, each going through separate transfer switches andpower distribution paths.Both paths have backup sources (+1) and serve critical components through separate UPS systems,providing a completely redundant setup.The design also includes redundant paths to the mechanical equipment and ICT equipment, whichfurther indicates the fault-tolerant characteristics of a Rating-4 infrastructure.This setup allows for concurrent maintainability and ensures that no single failure in powerdistribution or UPS can impact the data centers operation, which is characteristic of the highestTier/Rated-4 classification.EPI Data Center Specialist References:EPI guidelines confirm that TIA-942 Rating-4 requires full redundancy and fault tolerance forelectrical infrastructure, ensuring continuous operation even during maintenance o
Question # 2
You are allowed to use a calculator for this question. The total power consumption of the ICT
equipment in a rack is 6 kW. The equipment is traditional ICT equipment with a Delta-T of
approximately 11 °C / 20 °F. Calculate the approximate CFM required to cool the equipment in the
rack.
A. Approximately 1,500 CFM B. Approximately 1,000 CFM C. Approximately 500 CFM D. Approximately 160 CFM
Answer: B
Explanation:To calculate the cooling airflow requirement for ICT equipment, you can use the formula:CFM=Power (kW)×3160ΔT(°F)\text{CFM} = \frac{\text{Power (kW)} \times 3160}{\Delta T(\text{°F})}CFM=ΔT(°F)Power (kW)×3160For equipment consuming 6 kW with a Delta-T of 20°F:CFM=6×316020=948≈1,000 CFM\text{CFM} = \frac{6 \times 3160}{20} = 948 \approx 1,000 \,\text{CFM}CFM=206×3160 =948≈1,000CFMDetailed Explanation:This formula provides an estimate of the cubic feet per minute (CFM) of air required to cool theequipment based on its power consumption and the temperature difference (Delta-T) betweenintake and exhaust. The Delta-T represents the cooling effectiveness of the airflow.EPI Data Center Specialist References:EPI recommends using this calculation for determining airflow requirements in data centers,ensuring that cooling systems are adequately sized to maintain equipment within safe temperaturelimits.
Question # 3
What indicates the breaking capacity of a fuse or breaker?
A. Mechanical strength of the casing of a fuse or breaker. B. The maximum voltage, in case of an electrical surge, that the fuse or breaker can handle withoutbeing destroyed or causing an electric damaging arc. C. The current at which the device will trip. D. The current that a fuse or breaker is able to interrupt without being destroyed or causing anelectric damaging arc.
Answer: D
Explanation:The breaking capacity of a fuse or breaker indicates the maximum current it can safely interruptwithout being damaged or creating a dangerous arc. This value is crucial for ensuring that the devicecan handle fault conditions and prevent equipment damage or fire risks due to excessive currentflow.Detailed Explanation:The breaking capacity, also known as the interrupting rating, ensures that the fuse or breaker cansafely handle fault currents up to a specified limit. Exceeding this capacity could result in the devicefailing to interrupt the current, potentially causing hazardous conditions like electrical arcs.EPI Data Center Specialist References:
EPI training underscores the importance of matching fuses and breakers with appropriate breakingcapacities for the anticipated fault levels in data centers to ensure reliable and safe operation.
Question # 4
The computer room has high levels of H2S gas contamination. What is the best option to resolve this
issue?
A. Vacuum the whole room using a HEPA/S-Class-based filter. B. Install air-scrubbers. C. Clean the room and racks with a damp/wet cloth. D. Provide more air changes per hour by adding more fresh air to the computer room.
Answer: B
Explanation:High levels of H2S (hydrogen sulfide) gas contamination in a computer room are best addressed byinstalling air-scrubbers. Air-scrubbers can effectively filter out contaminants, including corrosivegases like H2S, ensuring clean air circulation and protecting sensitive IT equipment from potentialcorrosion and damage.Detailed Explanation:Air-scrubbers are designed to remove various airborne contaminants and are particularly useful inenvironments where corrosive gases are present. These systems use filters or chemical reactions toneutralize harmful substances, making them ideal for data centers that need to maintain high airquality for equipment reliability.EPI Data Center Specialist References
Question # 5
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
Answer: B
Explanation:To determine the charging current for a battery bank, a general rule of thumb is that the chargingcurrent should be 5% of the total battery capacity. For a battery rated at 600 Ah, this calculationwould be:600 Ah×0.05=30 Amperes600 \, \text{Ah} \times 0.05 = 30 \, \text{Amperes}600Ah×0.05=30AmperesThis ensures the battery is charged efficiently without overloading the rectifier or risking batterydamage.DetailedExplanation:Battery charging current is typically set as a percentage of the battery's capacity to balance effectivecharging with longevity and safety. A 5% charging rate is standard for lead-acid batteries, whichwould be 30 Amperes for a 600 Ah battery bank.EPI Data Center Specialist References:EPI standards recommend calculating charging currents based on a percentage of the batterycapacity to ensure safety and efficiency, aligning with best practices for battery management in datacenters.
Question # 6
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?
A. Security guards should perform regular inspections verifying the system works. B. The system should not be based on motion detection as the lights might suddenly switch off while
staff is still at work. C. It is not advisable to use such a system since it will reduce the lifetime of LED lighting. D. At all times, the levels should allow for security cameras to function properly.
Answer: D
Explanation:When installing an automated lighting system, especially in a security-sensitive area like a datacenter, its essential to ensure that lighting levels support security camera functionality at all times.Sufficient lighting is necessary for cameras to capture clear footage, ensuring continuous monitoringand security regardless of occupancy.DetailedExplanation:Automated lighting based on occupancy or time settings can reduce energy costs, but it must beconfigured to maintain adequate illumination for surveillance. Security cameras require minimumlighting levels to operate effectively, so lighting should be configured to avoid compromising security.EPI Data Center Specialist References:EPI emphasizes security and safety in data centers, advising that lighting systems should maintainlevels conducive to effective surveillance, ensuring operational security even when lights areautomatically controlled.
Question # 7
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 correctweight?
A. Approximately 410 kg / 900 lbs B. Approximately 820 kg / 1,800 lbs C. Approximately 1,390 kg / 3,000 lbs D. Approximately 1,640 kg / 3,600 lbs
Answer: B
Explanation:The amount of FM200 gas required can be calculated using the formula:Weight of Gas=Net Volume×Design Concentration×S-Factor\text{Weight of Gas} = \text{Net Volume}\times \text{Design Concentration} \times \text{SFactor}Weight of Gas=Net Volume×Design Concentration×S-FactorUsing metric units:Net Volume: 2,500 m³Design Concentration: 7% (or 0.07)S-Factor: 0.1359Calculation:2,500 m3×0.07×0.1359=821.325 kg2,500 \, \text{m}^3 \times 0.07 \times 0.1359 = 821.325 \,\text{kg}2,500m3×0.07×0.1359=821.325kgRounded to the closest answer: 820 kgIn imperial units:Net Volume: 88,287 ft³S-Factor: 1.885Calculation:88,287 ft3×0.07×1.885=1,165.27 lbs88,287 \, \text{ft}^3 \times 0.07 \times 1.885 = 1,165.27 \,\text{lbs}88,287ft3×0.07×1.885=1,165.27lbsRounded, this is approximately 1,800 lbs.EPI Data Center Specialist References:EPI instructs on using specific formulas and S-factors provided by manufacturers for each gas type,ensuring that calculations reflect the correct concentration for the given room volume.
Question # 8
What should be considered when installing overhead data cabling?
A. To maintain minimum separation from power and ensure that the fire detection and suppressionsystems are not hindered. B. Copper data cabling should not be placed in metal cable trays. C. Optical fiber cabling should always be positioned on top of the copper cabling in the same cabletray to avoid damage to the sensitive optical fiber. D. All cabling should make sharp bends directly into the rack to avoid usage of additional space andblocking the airflow on top of the rack.
Answer: A
Explanation:When installing overhead data cabling, its crucial to maintain minimum separation from powercables to prevent electromagnetic interference. Additionally, cabling should be arranged so that itdoes not obstruct fire detection and suppression systems, allowing for proper sensor function andsuppression agent dispersion in the event of a fire.DetailedExplanation:Separation between power and data cabling minimizes the risk of interference and helps ensurecompliance with standards for signal integrity. Proper placement relative to fire suppression systemsensures that any smoke or heat can be effectively detected, and suppression agents can be evenlydistributed without obstruction from cabling.
EPI Data Center Specialist References:EPI guidelines emphasize maintaining adequate separation between power and data cables forsafety and performance and ensuring cabling does not interfere with essential safety systems in datacenters.
Question # 9
You are changing the design of the fire suppression system for your computer room from ahalocarbon fire suppression system into an inert-based fire suppression system. Could you use thesame formula to calculate the gas content for the gas?
A. No, there is a significant difference in the formula for the different types of fire suppression gases. B. Yes, as long as you take the difference between the net and gross volume into account. C. Yes, as long as you use the same units of measure, i.e., kg/m³ or lbs/ft³. D. Yes, as long as you change the 'S' factor of the formula to reflect the gas type used.
Answer: A
Explanation:The formula used to calculate the gas content differs significantly between halocarbon and inertbasedfire suppression systems. Halocarbon systems function by absorbing heat, while inert systemswork by reducing oxygen levels. Due to these differences in fire suppression mechanisms, distinctformulas are applied, factoring in the specific properties of each gas type and the requiredconcentration levels.Detailed
Explanation:Halocarbon systems like FM200 require a formula that accounts for the concentration needed forcooling, while inert gases like nitrogen or argon need a formula that calculates the volume based onoxygen displacement. As the design concentration and characteristics of these gases differ, itsessential 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 gasmanufacturer when switching fire suppression systems to ensure the correct amount of gas isdeployed for effective fire suppression.
Question # 10
What is the main disadvantage of using a ToR (Top of Rack) design?
A. A single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch. B. You need a separate rack to install all your ToR (Top of Rack) switches. C. There will be more switches to manage. D. A ToR (Top of Rack) switch has only optical interfaces.
Answer: C
Explanation:A Top of Rack (ToR) design typically requires more switches because each rack has its own switch tomanage network connections, as opposed to End of Row (EoR) or centralized designs, whichconsolidate switches. While ToR designs improve cabling efficiency and reduce latency, they alsoincrease the number of switches, thus raising management complexity and potentially increasingcapital and operational costs.Detailed
Explanation:In a ToR setup, each racks individual switch allows for quick access and streamlined cabling withinthe rack. However, this setup means more devices to configure, monitor, and maintain, which canincrease administrative overhead and network management complexity.EPI Data Center Specialist References:
EPI documentation notes that ToR designs can improve performance but also lead to increasedmanagement needs due to the higher switch count, making them less ideal in environments wheresimplified network management is prioritized.
Question # 11
What is the minimum requirement for the power feeds to the building for a Rated-3 data center
based on the ANSI/TIA-942 standard?
A. Two feeds coming from two different substations, one power company is not acceptable B. Two feeds coming from two different substations, one power company is acceptable C. Two feeds entering the data center building from one substation D. One feed from one substation split over two separated distribution boards in separate rooms
Answer: B
Explanation:The minimum requirement for power feeds to a Rated-3 data center according to ANSI/TIA-942 is tohave two independent power feeds, which can come from two different substations provided by thesame power company. This ensures redundancy and concurrent maintainability, as each feed cansupport the load independently during maintenance or failure of the other.Detailed
Explanation:The separation by two substations ensures resilience in case of a localized outage or substationmaintenance, aligning with Rated-3 requirements for uninterrupted operation. ANSI/TIA-942 permitsthese feeds from a single utility provider as long as they are supplied from distinct substations.EPI Data Center Specialist References:
EPI underscores the importance of dual power feeds from separate substations for Rated-3 facilities,highlighting that the ability to draw from different substations aligns with redundancy requirementsfor high availability.
Question # 12
A data center requires an audit to find out whether it conforms with ANSI/TIA-942 Rated-3(concurrently maintainable).Will the network architecture be part of this audit?
A. No, as concurrently maintainable only applies to electrical and mechanical (power and cooling). B. Yes, but only if the network administration does not comply with ANSI/TIA-606. C. Yes, amongst other aspects, the network architecture should be Rated-3 compliant with therequirements of ANSI/TIA-942. D. No, only the type of cabling used will be audited.
Answer: C
Explanation:For a Rated-3 data center, network architecture is indeed a key component of the audit underANSI/TIA-942. This rating requires concurrent maintainability across all systems, includingtelecommunications infrastructure. The network architecture must therefore meet specificredundancy and reliability standards to ensure uninterrupted operations during maintenance orfailure of any single component.Detailed Explanation:Rated-3 requirements extend beyond electrical and mechanical systems to include networkarchitecture. This ensures that telecommunications systems are also designed for concurrentmaintainability, thus contributing to overall uptime and resilience.EPI Data Center Specialist References: EPI endorses comprehensive assessments for Rated-3 facilities, emphasizing that network systemsmust meet standards for redundancy and concurrent maintainability, which align with ANSI/TIA942s holistic approach to data center reliability.
Question # 13
What is a significant difference between a halocarbon gas-based fire suppression system and an inertgas-based fire suppression system?
A. Inert gas has smaller-sized gas containers than halocarbon gas. B. Inert gas harms the environment and halocarbon gas does not. C. Halocarbon gas works on the basis of heat removal and inert gas works on the basis of oxygenreduction. D. Halocarbon gas works on the basis of oxygen reduction and inert gas works on the basis of heatremoval.
Answer: C
Explanation:A halocarbon gas-based fire suppression system primarily extinguishes fires through heat absorption.In contrast, an inert gas-based system works by reducing oxygen levels to a point where combustioncannot be sustained. Halocarbon agents, like FM-200, absorb heat from the fire, cooling it down,whereas inert gases, like nitrogen or argon, lower oxygen concentration.Detailed Explanation:Halocarbons are effective in quickly cooling flames and are suitable for electronic environments dueto their fast action. Inert gases displace oxygen to suppress fires, making them ideal in occupiedspaces where human safety can be managed during a fire event due to slower discharge times. EPI Data Center Specialist References:EPI training distinguishes between these suppression mechanisms, noting the importance ofselecting the correct system based on specific needs like quick response versus oxygen displacementfor environments with sensitive equipment.
Question # 14
Do you need to consider bullet (ballistics) protection when designing a data center?
A. Bullet (ballistics) protection is required by ANSI/TIA-942 for all data centers. B. Bullet (ballistics) protection is only required when the data center is located in an area with a highcrime rate. C. Bullet (ballistics) protection is required by ANSI/TIA-942 for data centers Rated 3. D. Bullet (ballistics) protection is only required if the facility is a potential target or the building is inthe vicinity of a potential target.
Answer: D
Explanation:Bullet (ballistics) protection is typically considered only for data centers that are potential targets orlocated near such targets. While ANSI/TIA-942 does not specifically require bulletproofing for all datacenters, it is prudent to consider it based on location risk assessments, especially if the facility is in ahigh-risk area or near critical infrastructure that could attract threats.Detailed Explanation:Protective measures like bulletproofing depend on the threat landscape and the data centersexposure to risks such as crime or terrorism. Assessments for physical security are typicallycustomized based on location-specific risks rather than being universally required by data centerstandards. EPI Data Center Specialist References:EPI guidelines emphasize customizing physical security measures based on threat assessments,suggesting that bulletproofing is appropriate in specific circumstances where the facilitys risk profilejustifies additional security measures.
Question # 15
What is a potential disadvantage of using water mist as a fire extinguishing system?
A. It only uses 10% of the water normally used in a water-based fire suppression, which might not beenough to suppress the fire B. It will rapidly increase the humidity level in the data center, which can cause a potential risk forthe operation of the equipment C. It extracts oxygen from the air creating a potential risk for humans inside the computer room D. It has droplets that are too small (100-120 microns) so it can only be used for small fires
Answer: B
Explanation:A potential disadvantage of using a water mist fire suppression system is that it can rapidly increasethe 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 shortcircuits or corrosion over time.Detailed
Explanation:Water mist systems use fine droplets to suppress fires by cooling and displacing heat. However, themoisture generated may raise the humidity level to the point where it exceeds safe operational limitsfor IT equipment. Therefore, while water mist systems are effective in fire suppression, they may notbe 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, particularlyin environments housing electronic equipment. Its essential to weigh the benefits of firesuppression against potential risks to operational equipment when choosing suppression methods.
Question # 16
Which formula is correct?
A. Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732 B. Phase-to-Neutral Voltage = Phase-to-Phase voltage .732 C. Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732 D. Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage
Answer: B
Explanation:The correct formula for calculating Phase-to-Neutral Voltage in a three-phase power system is PhasetoNeutral Voltage = Phase-to-Phase Voltage / 1.732. This formula applies to balanced three-phasesystems, where 1.732 (or √3) represents the relationship between line-to-line and line-to-neutralvoltages.Detailed Explanation:In three-phase systems, Phase-to-Phase Voltage is higher than Phase-to-Neutral Voltage by a factorof √3. Dividing the phase-to-phase voltage by 1.732 gives the phase-to-neutral voltage, which iscritical for understanding power distribution in three-phase electrical systems commonly found indata centers. EPI Data Center Specialist References:EPI electrical training highlights the importance of knowing these calculations for designing andmaintaining balanced power systems, which are essential for stable and efficient data centeroperations.
Question # 17
The electrical diagram of the data center shows the following UPS configuration and has a load of 80kW.What is the set-up in this data center?
A. 2+N+1 B. 2(N+1) C. N+N(+1) D. (N+1)-(N+1)
Answer: B
Explanation:A 2(N+1) configuration implies two independent UPS systems, each with N+1 redundancy. Thisconfiguration provides high availability by ensuring that each UPS system can independently supportthe load with an additional unit for redundancy. Given the 80 kW load, this setup implies that twoseparate N+1 systems are running, providing reliability and fault tolerance for the data centerspower needs.Detailed
Explanation:The N+1 notation denotes that each system has one additional unit beyond what is needed to carrythe load, providing redundancy. With 2(N+1), there are two such setups, ensuring that if one fails,the other can still support the load without interruption, fulfilling high availability requirements.EPI Data Center Specialist References:
EPI teaches that multiple redundant systems, such as 2(N+1), enhance data center reliability byensuring that power is maintained even if a failure occurs in one system. This meets the stringentdemands for uptime in critical environments.
Question # 18
Smoke sensors need to be tested to ensure that they pick up a potential fire in the data center.What should you recommend?
A. Test the sensors by injecting smoke or simulated smoke directly into the sensor B. Press the self-test button on each sensor in the data center C. Inject smoke at the floor level D. Test the sensors according to the vendor specification
Answer: D
Explanation:Testing smoke sensors should be conducted according to the vendor specifications to ensurecompliance with safety standards and accurate results. Vendors provide specific testing proceduresto account for the sensor type, environment, and operational characteristics, ensuring that tests donot damage the equipment or provide false results.
Question # 19
The building in which the computer room is housed is required to have a sprinkler system. Thebuilding is therefore equipped with a wet pipe system.What action, if any, should you recommend for the computer room?
A. Maintain the current wet pipe system. B. Replace the wet pipe system with a deluge system. C. Replace the wet pipe system with a dry pipe system. D. Replace the wet pipe system with a pre-action system.
Answer: D
Explanation:In computer rooms, replacing a wet pipe system with a pre-action system is advisable. Pre-actionsystems provide additional protection by requiring two triggers (e.g., heat and smoke) before wateris released, minimizing the risk of accidental discharge and water damage, which is crucial forsafeguarding sensitive IT equipment.Detailed
Explanation:Wet pipe systems contain water in the pipes at all times, which poses a higher risk of accidentaldischarge. Pre-action systems, however, only fill the pipes with water upon detection of a fire,reducing the risk of water-related damage due to leaks or malfunctions. This approach is consideredbest practice for environments housing sensitive electronic equipment.EPI Data Center Specialist References:
EPI advises using pre-action fire suppression in data centers to reduce risks associated withaccidental water release, providing a safer and more controlled fire response that better protectscritical infrastructure.
Question # 20
Is it allowed to make design changes during the implementation phase?
A. No, after a design freeze no further changes are allowed. B. Any change is fine as long as it is within the scope of the project. C. Yes, but only when time to implement is not exceeded. D. Only when there is a strong business and/or technical justification.
Answer: D Explanation:Design changes during the implementation phase are generally allowed only when there is a strongbusiness and/or technical justification. Changes at this stage can lead to delays, increased costs, orcompromise design integrity. Thus, a rigorous assessment is required to ensure any modifications areessential and provide clear benefits or address critical issues.DetailedExplanation:Changes post-design freeze should be minimized to avoid scope creep and additional costs. However,if a technical issue arises that would affect operational goals, or a business need warrantsmodification, justified changes are permissible, following an impact assessment and approvalprocess.EPI Data Center Specialist References:EPI project management guidelines recommend a controlled change management process duringimplementation, allowing changes only when they align with critical objectives or addressunforeseen issues that affect the project's success.
Question # 21
When installing a raised floor, can we use a spirit level bar to level the floor?
A. Yes, spirit level bars can be used as long as their length is longer than 60 cm ft (the size of atypical raised floor tile). B. No, because using a spirit level bar, a measurement error will be transferred from pedestal topedestal. C. Yes, but spirit level bars can only be used in the vertical plane. D. Yes, using a spirit level bar for raised floors higher than 40 cm is preferred.
Answer: B Explanation:A spirit level bar should not be used for leveling a raised floor, as measurement errors are likely topropagate from one pedestal to the next. Spirit levels can introduce cumulative errors, leading touneven floors, particularly in large installations where precise leveling is critical.DetailedExplanation:Using a laser level or a precision leveling device is recommended to ensure accuracy across all floortiles. Spirit levels, while adequate for short spans, can transfer small inaccuracies from one pedestalto another, which can cause alignment issues and floor instability over time.EPI Data Center Specialist References:EPI data center guidelines discourage the use of spirit levels for raised floors. Instead, they advocatefor precision tools like laser levels that ensure consistency and accuracy in large-scale installations,aligning with best practices for raised floor construction.
Question # 22
What is the calculation for the desired attenuation factor for shielding material?
A. A = 20 log (M / R)WhereA is AttenuationM is the maximum acceptable valueR is the real value measured B. A = M / RWhereB. A is AttenuationM is the maximum acceptable valueR is the real value measured C. A = 20 log (R / M)WhereA is AttenuationR is the real value measuredM is the maximum acceptable value D. You do not have to calculate the attenuation factor for shielding material as it always has the sameattenuation
Answer: C 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 measuredelectromagnetic field strength, and M is the maximum acceptable level. The logarithmic scale helpsquantify how much the shielding reduces EMF levels relative to the maximum allowable value.DetailedExplanation: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 shieldingmaterial, 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 thatshielding materials provide adequate reduction in EMF to protect sensitive equipment within datacenters.
Question # 23
A 5kW (power consumption) server keeps crashing with the message 'temperature too high'.The intake temperature is measured at 25 °C °F and a relative humidity (RH) level of 50%.The exhaust temperature is 29 °C °F and 45% RH.The raised floor is providing an adequate amount of CFM/CMH at a reasonable velocity.The pressure under the raised floor is approximately 25 Pa/0.1 inch H₂O.Analyze the situation and indicate what the most likely cause is for this server to crash.
A. Dust inside the server causing issues with convection-based heat transfer B. The exhaust temperature is exceeding the ASHRAE recommended values C. The raised floor pressure is too low and/or the raised floor tile % opening is not adequate D. No cause could be determined as the CFM/CMH of the air conditioning equipment is not stated
Answer: A Explanation:The servers repeated overheating despite adequate intake and exhaust temperatures suggests thatdust buildup inside the server may be impeding heat transfer. Dust accumulation can obstruct airflowwithin the server, insulate components, and disrupt the convection-based cooling systems thatregulate internal temperatures, leading to overheating and potential hardware failures.DetailedExplanation:While the intake and exhaust temperatures appear within acceptable ranges, internal dust canreduce airflow and impede cooling efficiency, causing internal components to overheat despiteseemingly normal ambient conditions. Regular cleaning and maintenance are critical for preventingdust-related issues, especially in high-powered equipment like a 5kW server.EPI Data Center Specialist References:EPI emphasizes regular maintenance to prevent dust buildup in data center equipment. Dust cansignificantly impact cooling efficiency and lead to overheating, which underlines the importance ofroutine cleaning for optimal server performance.
Question # 24
A data center is located in an area where the demand for power is higher than the utility powercompany is able to deliver. This results in frequent power outages and, therefore, power shedding(scheduled/controlled power shutdown for areas) is frequently applied. The mains power is morethan 650 hours/year not available.What type of generators should be installed?
A. Standby generators should be installed in at least an N+1 configuration B. Continuous generators should be installed, at least in an N+1 configuration C. A combination of standby-, prime-, and continuous-generators, as the duration of the poweroutage is unpredictable. The total available capacity of the generators should be at least 500% of thedata center load D. Continuous generators should be installed; no N+1 configuration is needed as the generators willrun all the time
Answer: B Explanation:In areas with frequent and extended power outages, continuous generators with at least an N+1configuration are necessary to ensure consistent power availability. Continuous generators aredesigned for prolonged operation, making them suitable for scenarios where utility power isfrequently unavailable, as in this case with outages exceeding 650 hours per year. An N+1configuration ensures redundancy, which is critical for maintaining uptime in a high-availability datacenter.DetailedExplanation:Continuous generators provide reliable power over long durations, unlike standby generators, whichare intended only for short-term use. The N+1 configuration ensures that there is always anadditional generator available in case of failure, thus maintaining power supply even if one generatorgoes offline.EPI Data Center Specialist References:EPI best practices recommend continuous generators with redundancy for data centers located inareas with high power instability to maintain reliability and continuous operation.
Question # 25
What should you consider when using raised floor tiles with air deflectors or louvers?
A. Tiles with air deflectors or louvers can be very heavy. B. Tiles with air deflectors or louvers will reduce the cooling capacity of the tile. C. Tiles with air deflectors or louvers do not allow for a flexible cooling solution. D. Tiles with air deflectors or louvers can only be used to cool storage equipment.
Answer: A Explanation:Raised floor tiles with air deflectors or louvers are typically heavier than standard tiles due to theadditional materials and mechanisms used to direct airflow. The added weight can pose challengesfor installation and adjustment, and consideration must be given to the floors load capacity and easeof maintenance.DetailedExplanation:Tiles with deflectors or louvers help direct airflow, enhancing cooling efficiency by focusing cool airwhere needed. However, these tiles are often heavier, which can affect handling and requirereinforced raised floor systems. It's essential to factor in the weight for any floor tile replacements orinstallations to ensure they are compatible with the raised floor's structural capacity.EPI Data Center Specialist References:EPI data center design training mentions the potential impact of heavy tiles on floor handling andload capacity. Data center operators need to plan for safe handling and load-bearing capacity whenusing such specialized tiles.
Join the Conversation
Be part of the conversation — share your thoughts, reply to others, and contribute your experience.
