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Which of the following statements about UPS rectifiers is wrong?
Which of the following statements about UPS rectifiers is wrong?A . With boost functionB . can convert direct current into alternating currentC . Can reduce UPS pollution to the power gridD . Can realize power factor correctionView AnswerAnswer: B
Which of the following are the characteristics of water-cooled chilled water air conditioners?
Which of the following are the characteristics of water-cooled chilled water air conditioners?A . Cooling towers need to be installed, suitable for large and medium-sized data centersB . No other optionsView AnswerAnswer: A
If the capacity of UPS is 20KVA, then in normal operation, the UPS front-end input capacity may be ()
If the capacity of UPS is 20KVA, then in normal operation, the UPS front-end input capacity may be ()A . 25KVAB . 30KVAC . 28KVAView AnswerAnswer: A
In the UPS system, which of the following is the most comprehensive description of the role of the inverter circuit?
In the UPS system, which of the following is the most comprehensive description of the role of the inverter circuit?A . Convert the DC voltage or battery voltage after AC rectification into AC voltageB . No other optionsView AnswerAnswer: A
Which of the following statements about batteries is wrong?
Which of the following statements about batteries is wrong?A . The battery room must be protected from overheating and thermal runaway.B . The battery expands because too much gas is released, causing the pressure to increase.C . When the battery reaches the end of its service life, no special treatment...
Which of the following functions can display the entry and exit records of data center personnel?
Which of the following functions can display the entry and exit records of data center personnel?A . Configuration ManagementB . Access Control ManagementC . Energy Efficiency ManagementD . Work Order ManagementView AnswerAnswer: B
Which of the following statements about battery packs in UPS systems is wrong?
Which of the following statements about battery packs in UPS systems is wrong?A . When the AC power input is normal, the AC power will charge the battery pack.B . Batteries are an important part of data center infrastructure and can provide power to back-end loads in the event of...
What is the requirement for the duration of a single fault in a Class II power grid?
What is the requirement for the duration of a single fault in a Class II power grid?A . ≤8 hoursB . ≤4 hoursC . ≤0.5 hD . ≤6 hoursView AnswerAnswer: D
According to Heinrich 's Law, in a machinery accident, which of the following is the proportion of casualties (serious injuries or deaths), minor injuries, and unsafe behaviors?
According to Heinrich 's Law, in a machinery accident, which of the following is the proportion of casualties (serious injuries or deaths), minor injuries, and unsafe behaviors?A . 1:10:100B . 1:50:200C . 1:35:400D . 1:29:300View AnswerAnswer: D
Which of the following does not belong to the components of chilled water air conditioner?
Which of the following does not belong to the components of chilled water air conditioner?A . Condensing agentB . NoneView AnswerAnswer: A
