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NEW QUESTION 21
Exist UPS in the system, the most comprehensive description of the role of the inverter circuit is
____________ .
Answer:
Explanation:
converting the rectified DC voltage of the mains or the battery voltage into AC voltage
NEW QUESTION 22
MCB Circuit breaker CThe setting value of level tripping is in ____________, used in ITLoad occasions.
Answer:
Explanation:
5-10ln
NEW QUESTION 23
The following components that can improve the heat exchange capacity of the heat exchanger are
____________ .
Answer:
Explanation:
fan
NEW QUESTION 24
When the AC power equipment is introduced in the three-phase four-wire system, in addition to the grounding of the near end of the power transformer, the near end of the electrical equipment and the equipment room should be grounded repeatedly on the neutral line.
- A. False
- B. True
Answer: B
NEW QUESTION 25
____________ can be used as a side air outlet or as a lower air outlet.
Answer:
Explanation:
Double louvered air outlet
NEW QUESTION 26
The increase of cabinet power density will lead to the emergence of local hot spots in the computer room, and row-level air conditioners can solve local problems. The hot spot is too high.
- A. False
- B. True
Answer: B
NEW QUESTION 27
The dynamic environment monitoring system supports the alarm management function.
- A. False
- B. True
Answer: B
NEW QUESTION 28
The compressor is the core of the refrigeration cycle. It is the power device for the refrigerant to circulate in the system. It reduces the low temperature from the evaporator. The compressed steam is compressed into high temperature and high pressure steam.
- A. False
- B. True
Answer: B
NEW QUESTION 29
High sensible heat ratio is the only difference between precision air conditioners and civil air conditioners.
- A. False
- B. True
Answer: A
NEW QUESTION 30
The alarms of the dynamic environment monitoring system usually have different levels.
- A. False
- B. True
Answer: B
NEW QUESTION 31
The fire fighting system of the computer room is mainly composed of ____________ system.
Answer:
Explanation:
automatic fire alarm, gas fire extinguishing, smoke prevention, and safe evacuation
NEW QUESTION 32
____________ The main function is electric energy distribution, which distributes the front-end electric energy to various types of electrical equipment according to requirements, standards and specifications, such as ups, Air conditioning, lighting system, etc.
Answer:
Explanation:
Low-voltage power distribution system
NEW QUESTION 33
According to different classifications of electrolytes, batteries can be divided into ____________ and
____________ .
Answer:
Explanation:
lead-acid batteries , alkaline batteries
NEW QUESTION 34
In the air conditioning system, the function of the oil and gas separator is to separate the lubricating oil from the compressor exhaust and return the separated lubricating oil to the compressor.
- A. False
- B. True
Answer: B
NEW QUESTION 35
The role of the safety valve in the battery structure prevents excessive internal pressure from being excessive
____________ exclude.
Answer:
Explanation:
hydrogen H2
NEW QUESTION 36
Which of the following descriptions about the air supply method from top to bottom is correct ____________ .
Answer:
Explanation:
the air supply outlet is located in the upper part of the air-conditioned room, and the return air outlet is located in the lower part of the air-conditioned room
NEW QUESTION 37
In the main inverter mode,ups When overloaded, it will switch from the main circuit inverter to the battery inverter mode.
- A. False
- B. True
Answer: A
NEW QUESTION 38
UPS It can purify the mains input, output stable AC, and protect the load.
- A. False
- B. True
Answer: B
NEW QUESTION 39
Use POE At the interface, it has two functions: pass and power supply.
- A. False
- B. True
Answer: B
NEW QUESTION 40
12V The battery is made of 6 indivual 2V It is composed of battery cells.
- A. False
- B. True
Answer: B
NEW QUESTION 41
For valve-regulated lead-acid batteries, the function of the safety valve is ____________ .
Answer:
Explanation:
eliminate excess gas and prevent air from entering
NEW QUESTION 42
There are three different classifications of grounding forms in low-voltage power distribution systems,
____________ . The second capital letter represents ____________ .
Answer:
Explanation:
TN,TT,IT , representing the relationship between the exposed conductive part of the power receiving system and the ground
NEW QUESTION 43
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