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NEW QUESTION # 69
Which of the following control modes can be used for temperature and humidity control of smart cooling products?
Answer: A,B,D
Explanation:
Smart cooling temperature and humidity control is based on where the control "reference point" is measured and regulated.Supply air controluses the unit outlet sensor as the main reference, so the system directly regulates the temperature (and humidity when configured) of the air delivered to the IT area. This provides stable supply conditions and is widely used for predictable airflow organization.Return air controluses the unit inlet/return sensor as the reference, reflecting the heat absorbed from IT loads; it helps the unit respond to real load changes and maintain stable operation when room mixing or load distribution varies.Cold aisle controluses sensors placed in the cold aisle (near rack inlets) as the reference, aligning control with the most critical point for IT reliability-server intake conditions-especially in contained aisle scenarios.Hot aisleis generally not used as a primary temperature-and-humidity control mode because hot aisle conditions are intentionally high and variable (driven by load and containment), and controlling to hot aisle targets can conflict with ensuring stable rack inlet temperature and proper dehumidification behavior. Therefore, A, B, and C are valid control modes.
NEW QUESTION # 70
During wizard startup, when you enter the screen for selecting commissioning items for the first time, all items are selected by default. Which item is mandatory. You can deselect other commissioning items that are not mandatory.
Answer: A
Explanation:
In Huawei precision cooling commissioning, the wizard groups functional commissioning items so technicians can validate key subsystems efficiently. Thecooling system commissioningis mandatory because it verifies the primary control and protection loop that directly determines whether the unit can safely provide cooling capacity. This includes confirming the refrigeration or chilled-water cooling path can start and stop correctly, sensors and control logic are valid, and protection conditions (such as abnormal pressures
/temperatures, flow conditions, or interlocks) behave as expected. Without completing cooling-system commissioning, the unit's core purpose-stable temperature control for IT loads-cannot be assured, and the controller cannot reliably judge normal versus fault states during operation.
Other items (indoor fans, condensate pump, humidifier) are important butscenario-dependent: some sites do not use humidification, some drainage designs do not require an internal condensate pump, and fan checks can be handled as part of broader functional tests or may vary by redundancy configuration. Therefore, the wizard allows non-mandatory items to be deselected, but the cooling system commissioning must remain selected to complete a valid baseline commissioning workflow.
NEW QUESTION # 71
During routine maintenance of the lithium battery cabinet, which of the following procedure is true about replacing a faulty battery module?
Answer: B
Explanation:
The correct sequence prioritizeselectrical safety first, then mechanical disassembly. You mustconfirm the batteries are not discharging(Step 1) to avoid working under load. Next, the cabinet must be placed into a safe powered-down state byswitching off the battery circuit breaker and long-pressing the POWER ON/OFF button to power off the cabinet(Step 6). Only after the cabinet is safely powered down should you open up the working area byremoving the front covers of the faulty module and adjacent modules(Step 3). Then youturn off the ready switchon the battery management module (Step 2) to prevent the system from re-enabling the module unexpectedly during maintenance. After that, youloosen the securing bolts and pull out the battery management module about 10 cm(Step 5) to create operating space and ensure isolation for subsequent operations. With the cabinet safely stopped, you canremove the cables and copper barsconnected to the faulty module (Step 7), and finallyremove the baffle plate and pull out the faulty battery module(Step 4).
NEW QUESTION # 72
Which statement about gas-based fire suppression systems (e.g., FM200, Novec 1230) commonly used in data centers is correct?
Answer: D
Explanation:
Clean agent gas suppression systems work by absorbing heat or disrupting the chemical chain reaction of combustion, extinguishing fires quickly while being electrically non-conductive and leaving no residue, making them suitable for sensitive electronic environments -- unlike water- based systems.
NEW QUESTION # 73
The software installation package does not need to be downloaded for the preinstalled server.
Answer: A
Explanation:
In Huawei delivery scenarios, a preinstalled server means the target software (for example, the NetEco platform and its required runtime components) has already been deployed and integrated on the server image before it is handed over for on-site commissioning. Because the installation media has already been applied, the on-site engineer's work typically shifts from "software installation" to "environment verification and initialization," such as confirming OS/service status, checking resource allocation, validating database and middleware health, verifying network planning (IP, gateway, DNS/NTP as required), and completing application-level initialization (site creation, user/role configuration, northbound interface settings, and device/model import if needed). In this case, downloading the full installation package is not a mandatory step for commissioning, because the package is mainly required when performing a fresh installation or reinstall/upgrade. However, standard practice is still to prepare supporting materials (patches, licenses, and compatibility documents) and ensure the preinstalled version matches the project baseline before acceptance.
NEW QUESTION # 74
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