QUESTION: 25

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?

PUE does not indicate efficiency
Data center A
Data center B
Data center C

Answer(s): 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
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

Reference:

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.

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QUESTION: 26

What precaution shall be taken for cabling leading into an equipment rack when a data center is in a seismic-prone area?

Cables should be loosely organized to allow for movement and be latched at the connectors.
Cables shall be tightly organized to the rack and trays to avoid movement.
Cables can be organized in any way as it is not important.
Cables should be replaced by busbar trunking.

Answer(s): 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
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

Reference:

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.

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QUESTION: 27

Do you need to consider blast protection when designing a data center?

No, there is no reason for implementing blast protection as nobody can predict the impact of a bomb explosion.
Yes, if the data center is a potential target or the building is located within the vicinity of (close by) a potential target.
No, blast protection is not a requirement of ANSI/TIA-942.
Yes, blast protection is a requirement of ANSI/TIA-942.

Answer(s): 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
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

Reference:

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.

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QUESTION: 28

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

D-Curve
C-Curve
B-Curve
A-Curve

Answer(s): 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
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

Reference:

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.

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Free CDCS Exam Braindumps (page: 7)

QUESTION: 25

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QUESTION: 26

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QUESTION: 27

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QUESTION: 28

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