EMT Practice Test

1. Question Content...

---

Question1: The surface cooler controls the indoor temperature and humidity through the heat exchange between the refrigerant and the indoor air.

Question2: In the low-voltage power distribution system,N The role of the wire is to return the AC operating current.

Question3: The function of Huawei's chilled water air conditioner plug-in frame power supply is to provide a stable power supply for the fans.

Question4: For unsaturated air, dry bulb temperature, wet bulb temperature, A The relationship between point temperature is ____________ .

Question5: Common device communication methods are RS232,RS485,FE Wait.

Question6: The possible functions of the dynamic loop monitoring system include ____________ .

Question7: MCB Circuit breakers can be divided into ____________ and (magnetic trip) according to the principle of tripping.

Question8: ____________ is used to ensure that the fire extinguishing agent has been sprayed out in a specific jet form to promote the rapid gasification of the fire extinguishing agent and reach the fire extinguishing concentration in the protected space.

Question9: The following air conditioners are comfortable air conditioners ____________ .

Question10: International Electrotechnical Commission ____________. The specified contact voltage limit is
____________V, And stipulate 25V. The following does not need to consider the prevention Safety measures to prevent electric shock.

Question11: Huawei Monitoring System NetEco Support through ____________, send alarm information to customers.

Question12: At the end of the discharge of lead-acid batteries, the voltage drops, and the positive and negative active materials are converted into ____________ .

Question13: The fuse can protect personal safety when the equipment leaks.

Question14: According to the storage methods of different electrolytes in batteries, it can be divided into ____________ with ____________ .

Question15: The actual work of the circuit breaker can reach several thousand amperes, and at the same time, it requires high segmentation capability and thermal stability. ____________

Question16: During the implementation process, corrosive operations should be used ____________ .

Question17: ABC Circuit breakers are mainly used IT Load front end, such as ups Inside the output cabinet.

Question18: The following outdoor unit models belong to dual fans are ____________ .

Question19: The following ____________ Circuit breakers are usually used ITLow-voltage circuit breaker for the load.

Question20: The dynamic environment monitoring system supports the alarm management function.

Question21: The user can use the ____________ function to assign personnel to handle the fault.

Question22: Sensible heat ratio=Sensible heat/Full heat/Sensible heat/(Sensible heat+Latent heat).

Question23: The following are air-cooled row-level air conditioners ____________ .

Question24: At a certain atmospheric pressure and water vapor content, the air is cooled down. When the air reaches saturation, it will continue to cool down. The temperature at the time of condensation is ____________ .

Question25: The principle of the condenser is to cool the high-pressure gaseous refrigerant to release heat into a liquid state to realize the transfer and release of heat.

Question26: UPS Common system configurations are N system,N+X system,2N system.

Question27: Huawei Monitoring System NETECO The northbound interface can be accessed ____________ .

Question28: In Huawei's dynamic environment monitoring system, it is at the data collection layer and can integrate the underlying components ____________ . The equipment through which information is transmitted to the monitoring software is ____________ .

Question29: The use of water fire and foam fire extinguishing systems in the data center will not cause damage to communication equipment.

Question30: RER It is used to measure the use of renewable energy in the data center to promote the regeneration of solar, wind, and water energy, and the use of energy with no carbon emissions or very little carbon emissions.

Question31: In the dynamic environment monitoring system, ____________ is used to indicate the severity of the corresponding fault.

Question32: UPS Common working modes are ____________ .

Question33: When the mains input range is voltage:150-260VAC,frequency:45-60Hz,the following ups Working range
____________ It can work normally in the inverter state of the main circuit.

Question34: Leakage current protector is based on the current exceeds the specified value for a period of time, the melt is melted by its own heat, thereby breaking the circuit.

Question35: The user can upgrade the device version in the ____________ interface.

Question36: ____________ can complete the conversion from DC to AC.

Question37: Exist UPS in the system, the most comprehensive description of the role of the inverter circuit is
____________ .

Question38: The following air conditioners do not need to install cooling towers.

Question39: The abbreviation for valve-regulated lead-acid battery is VRLA.

Question40: Huawei Monitoring System NETECO Support video real-time browsing.

Question41: Huawei Monitoring System NetEco Must not support monitoring of third-party devices.

Question42: ____________ Yes upsThe unit of rated capacity.

Question43: In the case of ____________, ups Will work in static bypass mode.

Question44: CLF Defined as the power consumption of data center cooling equipment and IT The ratio of equipment power consumption.

Question45: The role of the lead-acid battery battery is to contain electrolyte, plates, separators, etc.

Question46: During the construction process, if there is an object falling or hitting, it should be used ____________ .

Question47: When the battery is in use, sunlight can directly shine on the battery.

Question48: The following is for high frequency ups The correct description of the rectifier components is.

Question49: The humidifier used in Huawei's row-level precision air conditioner is an infrared humidifier.

Question50: The dynamic environment monitoring system can be deployed in medium and large modular data centers, small modular data centers, container data centers, etc.

Question51: In the data center power supply and distribution system, if a power outage occurs, it is generally caused by Complete the standby switch between mains and mains or mains and diesel generators.

Question52: The following parts can check whether the refrigerant contains moisture ____________ .

Question53: MCB Circuit breakers can be divided into different tripping characteristics B, C, D, Z, K Level, for IT For load, you should use ____________ class Tripping characteristics.

Question54: The following ____________ are not part of the chilled water air conditioner.

Question55: 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.

Question56: Through the query ____________, the user can understand the operation of the device.

Question57: When the load is 60KW, Each ups The capacity is 100KVA, Power Factor 0.95, Then when the system must be redundantly configured, at least ____________ tower ups.

Question58: The fastest transmission rate of the following communication interfaces is ____________ .

Question59: High sensible heat ratio is the only difference between precision air conditioners and civil air conditioners.

Question60: UPS The front-end input can be two mains, one main and one standby, or one mains and one diesel engine input.

Question61: Huawei Monitoring System NetEco Cannot provide to third-party network management system SNMP Formal interface.

Question62: The valve-controlled sealed lead-acid battery safety valve has ____________ Function.

Question63: Huawei Monitoring System NetEco Only the infrastructure of a single data center can be managed, and the centralized and unified management of multiple geographically divided data center infrastructures is not possible.

Question64: The access control system can only set the user to open the door, and cannot set when to open the door.

Question65: The fire fighting system of the computer room is mainly composed of ____________ system.

Question66: According to the degree of equipment concentration, the air conditioning system can be divided into
____________ .

Question67: The function of the air system is to rationally organize the flow of indoor air, so that the temperature, humidity and cleanliness of the air in the indoor working area can better meet the process requirements and the comfort requirements of the human body.

Question68: TN-S The three-phase unbalanced current in the low-voltage power distribution system makes the protection line PS Generate voltage to ground.

Question69: The general method of connecting lead-acid batteries is to string first and then parallel.

Question70: In the access control system interface, the functions that can be realized are ____________ .