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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.
