Huawei H12-411 Actual Free Exam Questions & Community Discussion
TN-S low-voltage distribution system in the three-phase unbalanced current, so that the protection line PE generate voltage to ground.
Correct Answer: B
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The basic principle of the infrared humidifier is that the far infrared heats the water to boiling to generate steam.
Correct Answer: B
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Which of the following does not belong to the four major components of air conditioning?
Correct Answer: C
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Under certain conditions of atmospheric pressure and water vapor content, to cool the air, when the air reaches saturation, cooling will continue to condense when the temperature is ().
Correct Answer: B
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When AC power equipment are introduced in by using three-phase four-wire system, in addition to the zero line on the near side of the power transformer grounding, electrical equipment and the engine room should be near the ground repeatedly.
Correct Answer: A
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The function of the wind system is to properly organize the flow of indoor air so that the temperature, humidity and cleanliness of the air in the indoor work area can better meet the technical requirements and human comfort requirements.
Correct Answer: A
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In the dynamic environment monitoring system, the user queries the alarm information of the cooling equipment through () function.
Correct Answer: C
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In the process of battery, battery can be direct sunshine, and don't have to do any sunshade measures.
Correct Answer: B
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Which of the following options do not qualify as direct expansion air-cooled air conditioners?
Correct Answer: D
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Environmental refrigerant R410a refrigeration performance better than non-environmental refrigerant R22.
Correct Answer: B
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Protective grounding: grounding refers to the direct connection with the earth, electrical installations or electrical parts of the live part of a point connected with the earth, electrical installations or other devices are not charged part of the normal point of the earth and man-made connection.
Correct Answer: A
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In Main Inverter mode, the UPS will switch from Main Inverter mode to Static Bypass mode when mains input voltage and frequency exceed the allowable range of the UPS.
Correct Answer: B
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