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問題 #76
In a data center power distribution architecture, what is the primary function of a Static Transfer Switch (STS) for critical single-cord loads?
答案：D
解題說明：
Huawei data center power distribution design prioritizes continuity for critical loads. For single-cord IT equipment that cannot accept dual inputs, an STS provides a practical high-availability approach by connecting the load to two independent AC sources (often A and B feeds) and transferring the load to the healthier source when abnormalities occur. The key value is speed and coordination: the STS detects voltage/frequency deviations or source failure and performs a rapid transfer to minimize or eliminate interruption seen by the load. This supports O&M strategies where upstream systems (UPS, PDUs, distribution boards) are maintained or isolated without forcing downtime on single-cord devices.
In routine operations, STS status, transfer logs, alarms, and source quality parameters are monitored to prevent nuisance transfers and to ensure correct upstream selectivity and grounding. Correct commissioning also ensures the two sources meet synchronization conditions and that bypass
/maintenance procedures are standardized, improving safety and reducing operational risk.
問題 #77
Which O&M practice is most effective for identifying cooling inefficiency caused by airflow problems in an operating data center?
答案：C
解題說明：
Huawei facility O&M methods emphasize using monitored operating data to locate inefficiencies before they become faults. Airflow-related cooling inefficiency commonly appears as hot spots at rack inlets, elevated return air temperature fluctuations, abnormal fan speed increases, or uneven temperature distribution across aisles. By trending rack inlet temperature sensors alongside cooling unit supply
/return temperatures and fan speed or airflow commands, operations teams can distinguish between insufficient cooling capacity and poor airflow organization. Recirculation (hot air returning to rack inlets) often raises localized inlet temperatures without a proportional rise in room average temperature, while bypass (cold air short-circuiting back to returns) reduces cooling effectiveness and can drive fans to higher speeds unnecessarily. Data-driven checks support targeted corrective actions such as sealing cable openings, adjusting floor tile placement, restoring containment integrity, balancing airflow, or optimizing setpoints. This approach improves thermal stability, prevents overcooling, reduces energy waste, and aligns with Huawei's emphasis on integrated monitoring and closed-loop optimization for reliable, efficient operation.
問題 #78
Which of the following is the cabling mode of external power cables in IT scenarios of the FusionDC1000A?
答案：C
解題說明：
In the FusionDC1000A IT scenario, the external input power cables are designed to enter the power distribution system through dedicated cable inlets at the bottom of the Power PDB. During installation, the procedure requires opening the Power PDB, removing the plugs from the bottom cable holes, and routing the external input power cables into the cabinet through these bottom entries before arranging them along the nearby cable support/bridge inside the Power PDB area.
After the cables are terminated (for example, L1/L2/L3/N and PE), the bottom cable entries are resealed using waterproof sealing materials to maintain enclosure protection performance. This bottom-entry method supports reliable mechanical routing for thick/armored power cables, reduces bending stress, helps maintain orderly segregation from signal cabling, and improves on- site safety by guiding high-current cables through a controlled inlet path. Therefore, the correct cabling mode for external power cables in FusionDC1000A IT scenarios is bottom cabling.
問題 #79
The frequency of power supply equipment can be 50 Hz, 60 Hz, or 70 Hz.
答案：A
解題說明：
In data center power systems, the utility grid frequency standard iseither 50 Hz or 60 Hz, depending on the country/region. Data center facility equipment-such as UPS systems, power distribution units, switchgear, and monitoring components-is designed to operate reliably under these standardized grid frequencies, with acceptable tolerance ranges around the nominal value. While some power conversion equipment can adapt between50/60 Hz(for example, via frequency tracking or double-conversion),70 Hz is not a standard utility frequencyused for data center facility power supply, and it is not treated as a normal operating frequency in typical design, acceptance testing, or O&M procedures. From an operations perspective, maintaining correct frequency is critical because abnormal frequency can trigger UPS transfer logic, increase losses, create synchronization issues with bypass sources, and negatively affect downstream IT loads. Therefore, stating that power supply equipment frequency "can be 50 Hz, 60 Hz, or 70 Hz" is incorrect for standard data center infrastructure practice.
問題 #80
After the battery module is installed, the torque and insulation should be checked according to the specified requirements.
答案：B
解題說明：
This statement is true because post-installation verification is a mandatory acceptance step for battery systems in data centers. After a battery module is installed, torque verification ensures that all power terminals, interconnect bars, and grounding points meet the specified tightening requirements. If torque is too low, contact resistance increases, which can cause abnormal heating, voltage drop, nuisance alarms, and even connector damage during high current charge/discharge. If torque is too high, threads, lugs, or busbars can be damaged, creating hidden reliability risks. Insulation testing confirms that the battery circuit has no unintended leakage paths to chassis or ground and that cable routing, connector seating, and protective covers are correct. This is especially important for lithium battery cabinets where high DC voltage and large fault current capability demand strict electrical isolation. Performing torque and insulation checks after installation reduces early-life faults, improves safety, and ensures the cabinet can pass commissioning tests and enter stable service under UPS charge/discharge control.
問題 #81
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