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Exin CDCS Sample Question Answers
Question # 1
What mainly affects the cooling capacity of a raised floor tile?
A. Type of ICT equipment, location of the air conditioner, pressure under the raised floor, allowabletemperature in the hot aisle B. Relative humidity in the computer room, temperature of the cold air, pressure under the raisedfloor, construction material of the tile C. Percentage of the surface opening, obstruction of the supporting construction, pressure under theraised floor, damper construction D. Percentage of the surface opening, airflow direction of the ICT equipment, temperature differencebetween the air intake and air exhaust of the ICT equipment, construction material of the tile
Answer: C
Explanation:
The cooling capacity of a raised floor tile is primarily influenced by the percentage of surface
opening, the obstruction caused by the supporting construction, the pressure under the raised floor,
and the damper construction. These factors dictate how much airflow can pass through the tile and
how effectively cool air is distributed to the equipment in the data center.
Detailed
Explanation:
The percentage of surface opening on a floor tile affects how much air can flow through, with larger
openings allowing more airflow. Supporting structures beneath the floor can obstruct airflow,
reducing cooling efficiency. Pressure under the raised floor impacts the velocity and volume of air
that moves through the tile. Additionally, if dampers are installed, they control the airflow rate,
which can be adjusted to meet specific cooling needs for the area.
EPI Data Center Specialist References:
EPI guidance on airflow management under raised floors emphasizes these factors as critical for
effective cooling, especially in high-density areas. Ensuring unobstructed and adequate airflow helps
maintain consistent cooling across equipment.
Question # 2
An MCB needs to be installed in the PDU of an air-conditioner unit.
Which breaking curve should you select?
A. D-Curve B. C-Curve C. B-Curve D. A-Curve
Answer: B
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.
Question # 3
Do you need to consider blast protection when designing a data center?
A. No, there is no reason for implementing blast protection as nobody can predict the impact of abomb explosion. B. Yes, if the data center is a potential target or the building is located within the vicinity of (close by)a potential target. C. No, blast protection is not a requirement of ANSI/TIA-942. D. Yes, blast protection is a requirement of ANSI/TIA-942.
Answer: B
Explanation:
Blast protection should be considered if the data center or its location is a potential target or is near
high-risk areas. Blast protection measures can protect both personnel and infrastructure from
potential explosion impacts, which could be essential in areas with heightened security risks.
Detailed
Explanation:
In areas where there may be risks of terrorist attacks or explosions due to nearby high-risk facilities,
implementing blast protection measures helps safeguard the data center's infrastructure. These
measures can include reinforced walls, blast-resistant windows, and secure entryways designed to
withstand explosive forces.
EPI Data Center Specialist References:
While not specifically mandated by ANSI/TIA-942, EPI training advises considering local risk factors,
including proximity to potential targets, when evaluating the need for blast protection. This approach
is aligned with risk assessment and mitigation practices to ensure facility security.
Question # 4
What precaution shall be taken for cabling leading into an equipment rack when a data center is in a seismic-prone area?
A. Cables should be loosely organized to allow for movement and be latched at the connectors. B. Cables shall be tightly organized to the rack and trays to avoid movement. C. Cables can be organized in any way as it is not important. 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.
Question # 5
Three data centers are benchmarked on facilities energy efficiency.Data center A has achieved a PUE of 2.45.Data center B has achieved a PUE of 1.20.Data center C has achieved a PUE of 1.90.Which of the data centers is operating at the highest facility efficiency?
A. PUE does not indicate efficiency B. Data center A C. Data center B D. Data center C
Answer: B
Explanation:
A Power Usage Effectiveness (PUE) of 1.20 (achieved by Data Center B) indicates the highest facility
efficiency among the three data centers. A lower PUE value signifies better energy efficiency, as it
means that a greater proportion of the total energy consumed is used directly for IT equipment
rather than for cooling, lighting, or other facility needs.
Detailed
Explanation:
PUE is calculated as the ratio of total facility energy to IT equipment energy. A PUE close to 1.0
suggests that almost all the energy is dedicated to computing processes, with minimal overhead.
With PUE values of 2.45, 1.20, and 1.90, Data Center B (1.20) operates most efficiently by devoting a
higher percentage of its total energy to IT equipment.
EPI Data Center Specialist References:
The EPI curriculum emphasizes PUE as a key metric for data center efficiency, with lower values
representing better performance. Achieving a PUE near 1.0 aligns with industry best practices for
energy-efficient data center design and operation.
Question # 6
What is the advantage or disadvantage of using MPO (Multi-fiber Push On)/pre-terminated fiber?
A. There is no advantage, as it cannot be used with OM4 optical fiber cables. B. There is no advantage, as it creates additional heat load in the data center. C. It speeds up installation and provides an easy upgrade to transmission speeds up to 40 Gbit/s -100Gbit/s. D. It is a very flexible system as it can be used for both copper cables and optical fiber cables.
Answer: C
Explanation:
MPO (Multi-fiber Push On) pre-terminated fiber offers the advantage of quick installation and
supports high-speed upgrades up to 40 Gbit/s and 100 Gbit/s. This technology simplifies connections
by allowing multiple fibers to be connected in a single plug-and-play module, reducing installation
time and making future expansions or upgrades to higher speeds easier.
Detailed
Explanation:
MPO connectors consolidate multiple fiber connections into a single interface, which simplifies cable
management and reduces installation complexity. This setup is particularly beneficial in data centers
where high-speed networks are essential, and where rapid deployment is necessary. MPO preterminated
fiber also supports the use of OM4 fiber, making it compatible with existing highperformance
cabling infrastructure.
EPI Data Center Specialist References:
EPI training highlights that pre-terminated fiber solutions, like MPO, can greatly enhance efficiency in
data centers. By reducing installation time and providing scalability for higher transmission speeds,
they align with best practices for maintaining flexible and future-ready network infrastructure.
Question # 7
The temperature in the computer room is being increased from 18°C°F to 27°C°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 higher B. The amount of gas required will not change C. The amount of gas required will be lower D. The change to the amount of gas cannot be determined without knowing the change in humidityas well
Answer: C
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.
Question # 8
When shielding material reaches its saturation point, what will be the impact?
A. The shielding material will reach its optimal shielding performance state. B. The shielding material will no longer be able to attenuate (reduce) additional EMF. C. The shielding material will increase its permeability factor. D. The shielding material will reach its maximum electrically charged state.
Answer: B
Explanation:
When shielding material reaches its saturation point, it can no longer effectively attenuate additional
EMF. At saturation, the materials ability to absorb or redirect magnetic fields is exhausted, meaning
it cannot provide further shielding beyond this point. Additional EMF exposure would pass through
the material without significant reduction.
Detailed
Explanation:
Saturation occurs when the materials magnetic domains are fully aligned with the magnetic field,
leaving no capacity to absorb or deflect further EMF. This can happen with high EMF levels, beyond
the materials design limits, resulting in a breakdown of shielding effectiveness.
EPI Data Center Specialist References:
EPI guidelines on EMF management indicate that selecting appropriate shielding materials with
sufficient capacity is essential to prevent saturation and ensure continuous protection. Saturation
limits should be considered during design to avoid compromised shielding performance.
Question # 9
It is assumed that EMF shielding material must be installed as the EMF levels coming from thetransformer room into the computer room are measured at 100mG. The transformer room isapproximately 10 meters away from the computer room and is separated by a corridor. You canassume that no physical issues are present for installing shielding material at any area/location.Where should you recommend the shielding material to be installed?
A. As close as possible to the computer room B. As close as possible to the transformer room C. It does not matter, either close to the transformer room or the computer room is okay as there isno impact to cost or shielding material performance D. Shielding is not required to be installed as 100mG is within the acceptable levels for computerrooms
Answer: B
Explanation:
EMF shielding is most effective when installed close to the source of the EMF, which in this case is
the transformer room. Shielding at the source contains the magnetic fields before they spread,
minimizing exposure throughout the facility, including the computer room.
Detailed
Explanation:
Placing shielding close to the EMF source minimizes the area impacted by electromagnetic
interference, as it reduces the distance over which the EMF can spread. Shielding materials near the
source can absorb or redirect EMF, providing the most effective reduction of EMF levels in adjacent
spaces, like the data center.
EPI Data Center Specialist References:
EPI data center training advises positioning shielding close to the EMF source to contain fields more
effectively and reduce interference in critical areas. This method is more efficient and cost-effective,
as it limits the spread of EMF from the point of origin.
Question # 10
The location of a data center is just above the Arctic Circle (North Pole). The outside air temperature
is never above 21°C°F.
Taking energy efficiency as the highest priority, which cooling system should you recommend?
A. Standard air conditioning units, as spares might not be readily available B. Any cooling system can be efficient because the outside air temperature will not influence thetemperature of the air intake of the ICT equipment C. Waterside economizer D. Airside economizer
Answer: D
Explanation:
In locations with consistently cold temperatures, such as above the Arctic Circle, an airside
economizer is the most energy-efficient cooling solution. Airside economizers use cool outside air to
lower indoor temperatures, reducing or even eliminating the need for mechanical cooling. Given the
consistently low temperatures, this method maximizes energy efficiency by leveraging natural
cooling.
Detailed
Explanation:
Airside economizers are ideal in environments where outside temperatures are consistently low. By
drawing in and filtering cold outdoor air, they directly cool the indoor environment, thereby reducing
energy consumption significantly compared to traditional air conditioning. This cooling approach
aligns with energy efficiency goals by minimizing mechanical cooling demands.
EPI Data Center Specialist References:
EPI recommends the use of airside economizers in cold climates to achieve high energy efficiency, as
they allow data centers to capitalize on ambient conditions for cooling, aligning with sustainability
and cost-saving practices.
Question # 11
You are working on the design of a new facility. The electrical riser of the building with high currentpower is located close to the area where sensitive IT equipment in the computer room will belocated.What should you recommend to reduce the amount of EMF coming from the electrical riser?
A. Install single-phase power cabling B. Install three-phase power cabling based on three individual core wires C. Install bus bar trunking D. Install three-phase power cabling based on a combined cable (e.g. XLPE etc.)
Answer: D
Explanation:
To reduce Electromagnetic Fields (EMF) emanating from the electrical riser near sensitive IT
equipment, three-phase power cabling in a combined cable (such as XLPE) is effective. Combined
cabling helps reduce EMF by keeping the conductors tightly packed, which minimizes magnetic fields
generated by current flow. Cables like XLPE (cross-linked polyethylene) also offer better insulation,
which helps mitigate EMF interference with nearby IT equipment.
Detailed
Explanation:
Using a combined three-phase cable reduces EMF because the magnetic fields generated by each
phase tend to cancel each other out when in close proximity. This arrangement helps reduce the
overall magnetic field strength. In addition, XLPE and similar materials provide good insulation,
making them a preferred choice for reducing EMF emissions around sensitive equipment.
EPI Data Center Specialist References:
EPI data center best practices recommend mitigating EMF interference through combined cabling
arrangements, especially near areas where sensitive IT equipment is located. Reducing EMF is crucial
to maintaining equipment reliability and ensuring compliance with safety standards.
Question # 12
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
Answer: A
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 References:
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 # 13
The data center has been in operation for about 1 year and 2 months. The dust levels in the
computer room are relatively high. What is the most likely root cause?
A. The cleaning crew is not doing their work properly B. Every computer room has high dust levels due to constant high-speed air movement C. Low pressure in the computer room D. Floorboards are most likely not fitted correctly
Answer: D
Explanation:
High dust levels in a computer room are often due to improperly fitted floorboards. When
floorboards are not securely installed or do not fit tightly, they allow dust and particles from the
subfloor to enter the room. In a data center, this can lead to high levels of dust that affect air quality
and equipment performance.
Detailed
Explanation:
Raised floors in data centers can accumulate dust and debris, especially if the floorboards are not
properly sealed. Loose or improperly fitted floorboards allow contaminants from the subfloor to
enter the data center environment, increasing the dust levels over time. Proper installation and
maintenance of floor panels are essential to prevent dust infiltration and maintain clean conditions.
EPI Data Center Specialist References:
EPI training emphasizes proper flooring installation and maintenance to control air quality within
data centers. Correctly fitted floorboards prevent dust accumulation from the subfloor, which helps
protect sensitive equipment and maintains a cleaner environment.
Question # 14
A data center scores Rated-3 in mechanical, Rated-4 in electrical, and Rated-2 in architectural.
What is the overall Rating of this data center when the Rating is based on the ANSI/TIA-942?
A. Rated-2 since that is the lowest rating received B. Rated-4 since that is the highest rating received C. Rated-4 since electrical is more important than mechanical and architectural D. Depends on the Rating scored in telecommunications
Answer: A
Explanation:
According to ANSI/TIA-942 standards, the overall data center rating is determined by the lowest
rating among all evaluated categories. Therefore, if a data center is rated 2 in architectural, despite
being rated higher in mechanical and electrical, the overall rating is Rated-2. This approach ensures
that all aspects meet a minimum standard and prevents a higher rating if any critical area does not
comply.
Detailed
Explanation:
ANSI/TIA-942 evaluates data centers across several areas, including mechanical, electrical,
architectural, and telecommunications. The overall rating reflects the lowest rated category, ensuring
that no aspect of the data centers design or operation falls below the specified level. Thus, in this
case, the architectural rating of 2 dictates the final rating, ensuring a comprehensive and balanced
assessment of reliability and resilience across all aspects.
EPI Data Center Specialist References:
EPI Data Center Specialist training aligns with ANSI/TIA-942, stating that the final rating must reflect
the lowest score to ensure comprehensive reliability across all critical infrastructure categories. This
avoids overstating the data center's resilience and ensures uniform standards across areas.
Question # 15
The 'maximum exposed area' of the fire-rated glass is defined by the supplier as 3 sqm sqft. The
window area is 4 sqm sqft.
What would be the best option?
A. Do not use fire-rated glass due to the size limit and replace it with normal glass. B. Split the window in two equal parts using an aluminum frame. C. Split the window into parts smaller than specified as the maximum exposed area and ensure fireratedframes are used. D. Split the window in two equal parts fitted together with transparent silicon glue.
Answer: C
Explanation:
When the window area exceeds the maximum exposed area specified for fire-rated glass, it is
necessary to split the window into sections that comply with the fire rating requirements. This means
creating smaller sections that are each within the 3 sqm sqft limit and using fire-rated frames to
ensure that the entire assembly meets fire safety standards. This approach maintains the fire-rated
integrity of the glass, while allowing for larger window areas.
Detailed
Explanation:
Fire-rated glass is designed to contain fire and prevent it from spreading. If the window exceeds the
maximum exposed area defined by the supplier, the integrity of the fire-rated glass could be
compromised. By dividing the window into compliant sections with fire-rated frames, you ensure
that each pane performs as intended in the event of a fire. Fire-rated frames help maintain the fire
resistance across the entire assembly, making this option the best for safety and compliance. EPI Data Center Specialist References:
EPI recommends adhering strictly to fire safety standards, especially when using materials like firerated
glass. The guidelines emphasize that modifications should always respect the manufacturers
specifications to ensure the system remains effective in containing and preventing the spread of fire.
Question # 16
A computer room needs to be fitted out with a gas-based fire suppression system. The computer
room will be a high-density data center with about 30% of the racks being closed circuit cooling
blade-center racks.
Should the supplier of the fire suppression system be informed on the design of the racks?
A. No, cooling and design of racks have no influence on the fire suppression system design. B. Only when the rack height obstructs a potential fire suppression release point. C. Yes, the design of the racks has an influence on the fire suppression system design. D. Only when the racks might block access to the fire panel.
Answer: C
Explanation:
The design and configuration of racks, particularly high-density and closed-circuit cooling racks,
directly impact the fire suppression system design. Closed-circuit cooling racks, like blade-center
racks, can affect airflow and potentially trap heat, influencing how fire suppression agents are
distributed within the space. Therefore, it is essential to inform the fire suppression system supplier
about the rack design to ensure effective coverage and proper agent distribution.
Detailed
Explanation:
High-density racks can change how smoke and heat travel, which in turn affects fire detection and
suppression. Closed racks with built-in cooling can isolate airflow, requiring adjustments in fire
suppression design to ensure that suppression agents reach all necessary areas, including within
enclosed spaces. The supplier may need to account for these factors to ensure proper protection
coverage.
EPI Data Center Specialist References:
The EPI Data Center Specialist training underscores that fire suppression systems must be tailored to
the specific environmental characteristics of the data center. The design of racks, particularly highdensity configurations, should always be considered to ensure that suppression agents can
effectively control a fire, even in contained rack spaces.
Question # 17
A computer room with a raised floor has been designed with racks in a hot/cold aisle setup.
What should you recommend for the placement of down-flow air conditioners?
A. Air conditioners perpendicular to (at the end of the row of) the Cold-Aisle B. Air conditioners perpendicular to (at the end of the row of) the Hot-Aisle C. Air conditioners should always be placed at both sides of each row of racks D. Air conditioner placement has no influence on cooling effectiveness and efficiency. Hence, theycan be placed at any convenient location.
Answer: A
Explanation:
In a hot/cold aisle configuration, placing down-flow air conditioners perpendicular to the cold aisle
ensures that cool air is directed efficiently into the cold aisles where server intakes are located. This
layout allows for optimal cooling performance by aligning the airflow directly with the equipment
intakes, minimizing hot spots and enhancing cooling efficiency.
Detailed
Explanation:
With a raised floor design, cold air from the air conditioners is supplied into the cold aisle, where
server intakes are located. Positioning the air conditioning units perpendicular to the cold aisles
ensures that cool air is delivered directly into these aisles, preventing air mixing and optimizing
cooling. This setup takes full advantage of the airflow management strategy inherent to the hot/cold
aisle configuration.
EPI Data Center Specialist References:
EPI guidelines on cooling emphasize that down-flow air conditioners should be positioned to
maximize the effectiveness of cold aisle delivery, which improves cooling efficiency and helps
maintain consistent temperatures across server racks.
Question # 18
The humidity in the computer room has changed from about 50% down to 35% Relative Humidity(RH).What influence does this have on Electrostatic Discharge (ESD)?
A. No influence as long as the temperature is at approximately 20°C°F B. Relative humidity has no influence on ESD C. ESD levels will go up D. ESD levels will go down
reduce the amount of moisture in the air, which normally helps dissipate static charges. When the
humidity drops from 50% to 35%, the likelihood of static electricity accumulating on surfaces rises,
leading to a higher potential for ESD incidents that could damage sensitive IT equipment.
Detailed
Explanation:
ESD events are more common in dry environments because there is less atmospheric moisture to
neutralize electrical charges. Maintaining relative humidity above 40% helps minimize the risk of
ESD, which is why data centers often control humidity levels tightly to protect equipment from static
discharge that could cause hardware failures or data loss.
EPI Data Center Specialist References:
EPI data center best practices stress the importance of maintaining stable humidity levels to prevent
ESD, particularly in computer rooms. Recommended humidity ranges are typically above 40% to
prevent conditions that would foster static buildup.
Question # 19
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.
Question # 20
The UPS of a data center, with an ANSI/TIA-942 Rating-4, is installed with the rectifier connected to
power feed A and the bypass/reserve line input connected to power feed B.
To which feed will the output of the UPS be synchronized?
A. The UPS will not synchronize to any of the feeds but use an internal clock to set the output voltageand frequency B. Depends on the setting of the UPS, as the UPS can normally be set to either feed C. Feed A D. Feed B
Answer: B
Explanation:
For a UPS system in a Rating-4 data center, the synchronization of output can indeed depend on the
specific settings of the UPS. Generally, such systems allow for flexible configuration where the output
can be synchronized to either power feed A or B, depending on which feed is preferred for stability or
redundancy purposes.
Detailed
Explanation:
In dual-feed setups, such as those in high-redundancy data centers, the UPS can be set to
synchronize with either feed. This ensures that the UPS maintains continuity in case one feed
becomes unstable or fails. The flexibility to choose synchronization to either feed enhances the
resiliency and reliability of power supply, which is critical in Tier IV (Rating-4) facilities where uptime
is paramount.
EPI Data Center Specialist References:
The EPI Data Center Specialist course underscores the importance of configurable UPS systems in
Rating-4 data centers, where redundancy and continuous power are critical. By allowing
synchronization to either feed, the UPS can maintain the highest level of reliability, which aligns with
the rigorous standards expected in such environments.
Question # 21
The noise levels in the data center are approximately 91 dB (A).
Do employers need to take precautions?
A. No, anything less than 100 dB (A) is acceptable. B. There are no regulations regarding noise levels inside a building. Regulations only apply to noisepollution outside of the building. C. As long as the data is compliant to ISO/IEC 27001 it is acceptable. D. Yes, since it is mandated by regulations.
Answer: D
Explanation:
In a data center with noise levels of 91 dB (A), employers are indeed required to take precautions to
protect personnel, as this level exceeds commonly accepted safety thresholds for occupational noise
exposure. Regulations, such as those from the Occupational Safety and Health Administration (OSHA)
or similar agencies, mandate specific controls and protections for environments with high noise
levels.
Detailed
Explanation:
Noise levels above 85 dB (A) typically trigger requirements for hearing conservation programs. At 91
dB (A), steps like providing ear protection, conducting regular noise assessments, and possibly
implementing engineering controls to reduce noise should be taken. Extended exposure to such
levels can lead to hearing loss, so regulatory compliance ensures both immediate and long-term
protection for personnel.
EPI Data Center Specialist References:
EPI guidelines for data center safety address noise exposure as part of the environmental safety
measures. EPI recommends adhering to local occupational health regulations, as excessive noise can
harm personnel and affect operational efficiency due to potential health hazards.
Question # 22
What is the main reason to install Earth Leakage protection?
A. Protection of ICT equipment against high-frequency noise currents B. Protection of human lives C. Improvement of the data center grounding/earthing system D. Protection against lightning strikes
Answer: B
Explanation:
Earth Leakage Protection is primarily installed to protect human lives by detecting and disconnecting
power when a fault current flows to the ground. This type of protection is essential to avoid electrical
shock hazards that could occur when insulation fails, or equipment is improperly grounded.
Detailed
Explanation:
Earth leakage currents can occur due to insulation faults or accidental contact with live parts. Earth
Leakage Protection systems, such as Residual Current Devices (RCDs), quickly detect these faults and
disconnect the circuit to prevent harm to personnel. This is especially crucial in environments like
data centers where high-powered equipment is continuously running and any electrical fault can
pose significant safety risks.
EPI Data Center Specialist References:
EPI emphasizes that human safety is paramount in data center operations. Proper grounding and
leakage protection are fundamental safety measures, and EPI guidelines align with this focus,
underscoring the importance of protecting personnel from electrical hazards through appropriate
safety systems.
Question # 23
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. Nothing, as the chiller plant in the building also uses electrical power B. You will need to take the value for COP of the chiller plant into consideration C. You will need to take a weight factor of 0.4 for district chilled water into consideration D. PUE calculations are not possible in shared buildings
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 centers own
operations, and external utilities like district chilled water arent 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 centers 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, its 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.
Question # 24
A new network storage device in a non-standard size rack of approximately 600 kg,300 lbs is going
to be installed in the data center.
Are new floor loading calculations required?
A. No, as long as the equipment is less than 700 kg,500 lbs it will be within the limits. B. No, specifications of equipment brought into the data center will already be known during the design of the data center, and therefore the floor will be able to handle C. Yes, additional floor loading calculations need to be done by the floor manager, which should be verified by the safety engineer. D. Yes, a structural engineer, approved/endorsed by the building owner, should carry out new floor loading calculations.
Answer: D
Explanation:
For heavy equipment, such as a network storage device weighing approximately 600 kg,300 lbs,
new floor loading calculations are indeed required, particularly since the rack is non-standard. A
structural engineer, approved by the building owner, should conduct these calculations to ensure the
floor can safely support the new load without risking structural integrity.
Detailed
Explanation:
Data centers are designed with specific floor load ratings, which are determined during the design
phase based on anticipated equipment. When adding or replacing equipment that is significantly
heavy or non-standard, reassessing the floor's capacity is essential to avoid overloading. A structural
engineer has the expertise to verify if the existing floor can accommodate the weight and, if not, can
recommend reinforcement measures.
This step ensures compliance with safety standards and helps prevent damage to the infrastructure,
which could lead to costly repairs or even catastrophic failure in extreme cases.
EPI Data Center Specialist References:
EPI Data Center Specialist training advises that any changes in the data center load, particularly
involving non-standard and heavy equipment, warrant a structural assessment. Ensuring compliance
with floor load capacity is a critical safety and operational concern, as underscoring data center
infrastructure reliability and safety is a priority in EPI's best practices.
Question # 25
When are the wet bulb and dry bulb temperatures identical?
A. When the dry bulb's temperature is at the lowest allowable temperature for IT equipment as per ASHRAE B. When the dry bulb's temperature is at the highest allowable temperature for IT equipment as per ASHRAE C. When the relative humidity is at the best practice value for relative humidity, being 50% RH D. When the relative humidity is 100%
Answer: D
Explanation:
The wet bulb and dry bulb temperatures become identical when the relative humidity reaches 100%.
At this point, the air is fully saturated with moisture, meaning it can no longer absorb additional
water vapor. As a result, the rate of evaporation decreases, and there is no difference between the
dry bulb and wet bulb temperatures.
Detailed
Explanation:
The dry bulb temperature measures the air temperature, while the wet bulb temperature takes into
account the cooling effect of evaporation. When relative humidity is at 100%, the air has reached its
saturation point, and no further evaporation occurs. This causes both the wet bulb and dry bulb
thermometers to display the same temperature reading. This condition is critical in understanding
environmental conditions, particularly in HVAC and data center environments, where humidity
control is essential to avoid equipment overheating or corrosion.
EPI Data Center Specialist References:
The EPI Data Center Specialist training includes understanding humidity levels and their impact on
data center environments. Knowing when wet bulb and dry bulb temperatures align helps data
center operators manage moisture levels effectively, which is essential for preventing issues related
to high humidity, such as condensation on IT equipment.
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