Free Huawei H20-923_V1.0 Practice Exam with Questions & Answers | Set: 2

For an in-room cooling solution that usesoverhead air supply with air ducts, sufficient vertical space is required to accommodate the ductwork, airflow distribution components (such as plenums, turning vanes, flexible connectors, and diffusers), cable trays/pipes that may share the overhead route, and the necessary maintenance clearance. If the net height is too low, the duct cross-section becomes constrained, which increases airflow resistance and static pressure, reduces delivered airflow volume, and can cause uneven air distribution. This leads to hot spots, higher fan power, and difficulty maintaining stable supply/return temperature control. In Huawei data center air-conditioning design guidance, overhead ducted supply is therefore matched with aminimum net floor height requirement of 4 m, ensuring ducts can be sized correctly for the target airflow, noise, and pressure limits while preserving safe installation and maintenance space. A 3 m net height is generally suitable for non-ducted in-room layouts, but becomes insufficient once full overhead ducting is introduced.

In Huawei smart module monitoring architecture, theUIM20A expansion moduleis traditionally used toincrease device portsso cabinets can connect multiple intelligent components and sensors (for example, door status and environmental sensors). Huawei also provides theintelligent rPDU PDU2000M, whosemain control moduleincludes communications and DI interfaces designed to directly接入cabinet-level intelligent devices for centralized monitoring and management. In Huawei’s solution description for rPDU-monitoring networking, thePDU2000M is positioned to replace the expansion-module role, meaning that in applicable scenarios, cabinets can connect monitoring devices through the PDU2000M without deploying an additional UIM20A expansion module. This supports practical connections such asT/H sensors,smart U space managers, anddoor status/door-access related signalsthrough the PDU2000M interfaces, and then these devices are managed/bound in the controller’s smart module view. Huawei O&M guidance also emphasizes avoiding duplicate connections (do not connect the same device to both UIM20A and PDU2000M), aligning with the replacement concept. (Scribd)

Huawei precision cooling logic separates heater enablement into distinct control strategies to avoid unnecessary heating and to keep humidity control stable. InLow temperature heating, the heater is governed purely by the room temperature control demand: if temperature is below the heating threshold (or below setpoint with heating conditions met), the heater can start regardless of whether dehumidification is enabled, which matches statement D. InDehumidification heating, the heater is not a general low-temperature heater; it is an auxiliary function used to prevent overcooling during dehumidification and to maintain temperature while the unit dehumidifies. Therefore, the heater in this mode is permitted to start only when thedehumidification function is activeand temperature conditions require compensation, which matches statement B. Statement C is false because it incorrectly claims thatanyof the three selections will start heating automatically whenever room temperature is low; that is not true for “Dehumidification heating” unless dehumidification is actually enabled and running.

In Huawei UPS operating logic and standard data center O&M practice, themaintenance bypassis a mechanical path used to isolate the UPS for service. Innormal modethe load is carried by the inverter, so you shouldnot directly close the maintenance bypasswithout a controlled transfer procedure; doing so can create an unsafe parallel path or impact synchronization, therefore statementA is false. Instatic bypass mode, the load is supplied through the bypass path; if the bypass/mains source fails, the UPS can perform an automatic transfer from bypass to inverter, and the inverter will be supported by thebatterythrough the DC link, soB is trueunder the expected functional behavior.UPS5000-His designed as amodular UPS, supportingonline (hot) replacementof power modules to restore capacity without shutting down the entire system, soC is true. If therectifier mains input and bypass input share the same source, a mains outage removes the bypass source as well, meaning bypass operation is not available, soD is true.

Huawei’s indirect evaporative cooling system is designed to use theoutdoor air as a “free” cold sourcewhile keeping the data hall supply air isolated from outdoor contaminants and moisture. Its core is theheat exchanger, where heat from the indoor (return) air side is transferred to the outdoor working air side without mixing the two air streams. To enhance heat removal on the outdoor side, aspray systemwets the evaporation media or spray section, and awater pumpcirculates water to maintain uniform wetting and stable evaporation performance.Fansdrive airflow through the indoor and outdoor paths to ensure sufficient heat transfer and maintain the required air volume and pressure. Because outdoor air is involved on the working-air side,air filtersare required to reduce dust and protect the heat exchanger and internal airflow channels, improving reliability and reducing maintenance. Acompressoris not a main component of indirect evaporative cooling because the system primarily relies on evaporation and heat exchange rather than mechanical refrigeration.

For onsite replacement of a UPS power module, Huawei’s maintenance logic follows a safe “isolate → remove → insert → re-enable” sequence controlled by the moduleready switch. During removal, the ready switch must be rotated to theOFFstate first so the module is logically isolated from operation and will not participate in power conversion. After isolation, the four fixing screws are removed and a short waiting period is required to allow internal energy in capacitors to discharge before the module is pulled out. This matches statement②. During installation, the ready switch must remainOFFbefore insertion to prevent unintended startup or arcing during connector engagement. The module is placed in position, inserted slowly and evenly until fully seated, then secured with the four screws. Only after mechanical fastening and full seating is confirmed should the ready switch be rotated to theONstate to allow the system to recognize and bring the module online. This matches statement④.

For FusionCol8000-C chilled-water systems, Huawei commissioning requires awater leakage/pressure-holding teston the chilled-water piping after installation to verify joint sealing, valve interfaces, and connection integrity before long-term operation. The specified method is toraise the water pressure in the chilled-water pipe to 0.8 MPa, then observe for30 minutesto confirm there is no visible leakage. If the system remains dry, the same pressure isretained for 24 hoursas a stability verification step. The acceptance criterion is that thepressure drop is less than 0.01 MPaover the 24-hour period and no leakage is found, which demonstrates that the piping and fittings meet tightness requirements under the prescribed test pressure. This procedure helps prevent future failures such as slow seepage, corrosion around joints, insulation waterlogging, and unexpected shutdowns caused by water loss or low differential pressure alarms. It also ensures that subsequent flushing, venting, and operational commissioning can be performed safely and reliably.

Power Partner is Huawei Digital Power’s partner service platform used to support delivery, commissioning, maintenance, and service operations across the full lifecycle of a project. To match real project workflows, the platform defines multiple user roles that align with different responsibilities and permission scopes. AStartup engineerfocuses on commissioning activities such as obtaining startup authorization, performing initial configuration, and completing functional verification. AService engineerhandles routine maintenance, inspections, troubleshooting, part replacement guidance, and closure of service cases. AProject managercoordinates delivery milestones, resource planning, and overall service execution to ensure acceptance criteria are met. AnInventory operations managermanages materials/parts flow, tracking, and availability to support timely repair and maintenance. TheDOC (Delivery/Dispatch Operations Center)role supports centralized operations such as work order dispatching, progress supervision, and process compliance. Aservice manager of a representative officetypically oversees regional service quality, governance, and authorization control, ensuring the right people have the right access and that services are delivered according to Huawei process requirements.