Which of the following descriptions of lithium-ion battery separator is wrong?
- A . Allow lithium ions to pass through.
- B . Allow electrons to pass through.
- C . Contains micropores that can absorb electrolyte.
- D . The thicker the isolation film, the better its strength and safety, but the battery cell energy density is lower and the internal resistance is greater.
When the mains input range is voltage: 150-260VAC, frequency: 45-60Hz, what is the working range of UPS?
- A . 110-280V, 40-70HZ
- B . 180-280V, 50-90HZ
- C . 120-360V, 50-70HZ
Which of the following parameters can reflect the energy efficiency status and energy efficiency of a data center?
- A . ROI
- B . PUE
- C . MTTF
- D . SPC
Which of the following outdoor unit models has a dual fan?
- A . NETCOL500-A072
- B . No other options
Which of the following parameters represent the pollution of UPS to the power grid?
- A . Output power factor
- B . Input current harmonics
- C . Overload capacity
- D . Efficiency
MCB circuit breakers can be divided into B, C, D, Z, and K levels according to different tripping characteristics. Which level of tripping characteristics should be used for IT loads?
- A . B level
- B . C-level
- C . D level
- D . Z level
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 centers
- B . No other options
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 . 1:10:100
- B . 1:50:200
- C . 1:35:400
- D . 1:29:300
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 a utility power outage.
- C . If the UPS input voltage and frequency are wide, the battery life can be extended.
- D . When the inverter fails, the battery pack can still supply power to the rear-end load.
Which of the following does not belong to the integrated wiring system?
- A . Raised Floor
- B . Fiber Optic
- C . Cable Tray
- D . Patch Panel
In an air conditioning system, which of the following uses water cooling or air cooling to cool the high-temperature and high-pressure gas discharged from the compressor and release the heat to the outside?
- A . Evaporator
- B . Condenser
- C . Compressor
- D . Expansion valve
Which of the following are the advantages of UPS 2N system?
- A . Power supply redundancy, the UPS system can be maintained without switching the load to maintenance bypass mode, and there is no single path failure point
- B . The hardware configuration cost is low, and the UPS works under the designed high load conditions with the highest efficiency and higher reliability than the mains.
In the power supply and distribution system of the data center, if a power outage occurs, the backup switching between AC power and AC power or between AC power and diesel generator is generally completed by ().
- A . Automatic transfer switch system
- B . Diesel generator system
- C . Low voltage power distribution system
- D . Rack power distribution system
Which of the following is correct about the upward supply and downward return air supply method?
- A . The air supply outlet is located at the upper part of the air-conditioned room, and the air return outlet is located at the lower part of the air-conditioned room.
- B . None
In a circuit with resistance and capacitance, if the frequency of the current increases from 50 Hz to 100 Hz, how will the impedance of the circuit change?
- A . Increase
- B . Reduce
- C . No change
- D . Uncertain
Which of the following statements about UPS rectifiers is wrong?
- A . With boost function
- B . can convert direct current into alternating current
- C . Can reduce UPS pollution to the power grid
- D . Can realize power factor correction
What is the maximum data transmission rate supported by FE (Fast Ethernet)?
- A . 100K
- B . 10 M
- C . 1000 M
- D . 100 M
Which of the following statements about condensers is wrong?
- A . Under normal circumstances, the inlet temperature of the condenser in an air-cooled direct expansion air conditioner is higher than the outdoor temperature.
- B . Condensers can be divided into air-cooled condensers and water-cooled condensers.
- C . Condensation water will be generated when indoor air passes through the surface of the condenser.
- D . The condenser of an air-cooled direct expansion air conditioner is generally installed outdoors.
Which of the following descriptions about data center monitoring systems is wrong?
- A . Can monitor power system, environmental system, fire protection system, etc.
- B . Remote monitoring is not supported
- C . Can provide multiple alarm methods such as voice and short message
- D . Intelligent monitoring system can improve management efficiency
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 voltage
- B . No other options
Which of the following components does not belong to the smoke exhaust system in the fire protection system?
- A . Pressurized blower
- B . Smoke Exhaust
- C . Air duct
- D . Air sampling tube
Which of the following components is a fire detector that detects smoke particles?
- A . Heat Detector
- B . Pressure switch
- C . Smoke detector
- D . Sound and light alarm
() reflects the dryness of the air. The smaller the value, the drier the air.
- A . Moisture content
- B . Wet bulb temperature
- C . Relative humidity
- D . Dry bulb temperature
When electrolyte leakage occurs in the battery, () treatment method is more appropriate.
- A . Wear gloves and wipe it clean with a rag, and check whether it needs to be replaced
- B . No other options
Which of the following is the active material of the negative electrode of a VRLA battery?
- A . Lead sulfate
- B . Lead Dioxide
- C . Lead
- D . Lead sulfide
Which of the following is not a characteristic of a modular data center?
- A . Faster deployment compared to traditional data centers
- B . Easy to expand
- C . Compared with traditional data centers, the requirements for deployment environment are higher
- D . Can be pre-integrated and pre-debugged at the factory
Which of the following is the temperature of the cold channel air inlet area of the data center specified in GB50174-2017?
- A . 11 ℃ ~19 ℃
- B . 13 ℃ ~22 ℃
- C . 18 ℃ ~27 ℃
- D . 20 ℃ ~35 ℃
What is the English abbreviation for sealed valve-regulated lead-acid battery?
- A . VRLA
- B . GEL
- C . AGM
- D . GFW
Which of the following devices can be used to store video recordings for a long time?
- A . UPS
- B . NVR
- C . AC Actuator
- D . Switch
In Huawei DC power supply, which of the following is the meaning of BLVD?
- A . Battery low voltage power down
- B . Load low voltage power off
- C . Battery charge at low temperature
- D . Power off due to mains undervoltage
Which of the following descriptions of Huawei’s DC power supply are wrong?
- A . When the mains power is normal, the rectifier module not only supplies power to the load, but also provides floating charge current for the battery.
- B . When the mains power is off, the battery will power the device.
- C . When the battery temperature is too low, increase the battery charging voltage.
- D . When the mains power is normal and the real-time capacity of the lead-acid battery is lower than the set value, the battery switches from the equalizing charging mode to the floating charging mode.
Which of the following functions can display the entry and exit records of data center personnel?
- A . Configuration Management
- B . Access Control Management
- C . Energy Efficiency Management
- D . Work Order Management
The gas fire extinguishing system consists of ()
- A . Fire extinguisher storage bottle set, starting device, fire pipe network, sprinkler
- B . No other options
If the capacity of UPS is 20KVA, then in normal operation, the UPS front-end input capacity may be ()
- A . 25KVA
- B . 30KVA
- C . 28KVA
Which of the following models is Huawei’s room-level water-cooled air conditioner?
- A . NetCol8000-E220
- B . NetCol5000-C065
- C . NetCol5000-A042
- D . NetCol8000-C070
Which of the following functions uses electronic tag technology to provide real-time statistics on the location of power distribution, air conditioning, refrigeration and other infrastructure?
- A . Operation and maintenance management
- B . Asset Management
- C . Report Management
- D . System Management
Which of the following does not belong to the components of chilled water air conditioner?
- A . Condensing agent
- B . None
Which of the following belongs to air-cooled row-level air conditioner?
- A . NETCOL5000-A
- B . No other options
Which of the following descriptions about electrical equipment safety is wrong?
- A . The metal casing of electrical equipment must be grounded (zeroed) for protection
- B . Electrical equipment should be corrosion-resistant and moisture-proof
- C . When a fire occurs in electrical equipment, water can be used to extinguish the fire.
- D . It is strictly forbidden to use electrical equipment beyond the rated value
The active power is 80 kW, the power factor is 0.8, the system rated voltage is 380 V, 50 Hz, what is the current when the equipment is running at full power?
- A . 122 A
- B . 152 A
- C . 210 A
- D . 263 A
Which of the following is the maximum communication distance of RS485 communication method?
- A . 5 m
- B . 100 m
- C . 15 m
- D . 1200 m
Which of the following interfaces can both power the device and have communication functions?
- A . RJ45
- B . RJ12
- C . FE
- D . POE
For valve-regulated lead-acid batteries, what are the functions of the safety valve?
- A . Exhaust excess gas and prevent air from entering
- B . No other options
Regarding the description of the data center cooling system, which of the following is wrong?
- A . Among rack-level, row-level and room-level cooling, row-level cooling has the shortest airflow path.
- B . No other options
Which of the following devices cannot be connected to the southbound interface of the dynamic environment monitoring system?
- A . Precision air conditioning
- B . UPS
- C . Access control equipment
- D . Superior network administrator
The capacity of a UPS is 100 kVA, and its output power factor is 0.8. Which of the following is the maximum active power and reactive power that the UPS can output under rated conditions?
- A . 20 kW, 40 kVar
- B . 40 kW, 60 kVar
- C . 80 kW, 60 kVar
- D . 100 kW, 80 kVar
Which of the following components can check whether the refrigerant contains moisture?
- A . Solenoid valve
- B . Sight glass
- C . Filter drier
- D . Oil sight glass
Which of the following is not one of the four major components of an air-cooled air conditioner?
- A . Compressor
- B . Evaporator
- C . Fan
- D . Condenser
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 is required and it can be sold directly for scrap recycling.
- D . When the battery leaks, do not touch it directly with your hands.
What is the requirement for the duration of a single fault in a Class II power grid?
- A . ≤8 hours
- B . ≤4 hours
- C . ≤0.5 h
- D . ≤6 hours