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单选题 目前光纤通信中,光纤中传输的是( ). At present, ( ) is transmitted in optical fiber communication
学科：电能计量（第5期）（装表接电）Electric energy metering
时间：2023-05-25 05:54:15
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题目1单选题
低压三相四线电能计量装置,2号孔与10号孔之间的电压是( )伏. For low-voltage three-phase four wire electric energy metering device, the voltage between hole 2 and hole 10 is ( ) VA. 57.7B. 100C. 220D. 380
题目2单选题
低压三相四线电能计量装置,5号孔与8号孔之间的电压是( )伏. For low-voltage three-phase four wire electric energy metering device, the voltage between hole 5 and hole 8 is ( ) VA. 57.7B. 100C. 220D. 380
题目3单选题
高压三相三线电能计量装置,2号孔与5号孔之间电压是( )V. For high-voltage three-phase three wire electric energy metering device, the voltage between hole 2 and hole 5 is ( ) VA. 57.7B. 100C. 0.4千D. 10千
题目4单选题
三相四线电能计量装置C相电流,是( ). Phase C current of three-phase four wire electric energy metering device is ( )A. 从接线盒的左侧孔流入接线盒,右侧孔流出接线盒. The left hole of the junction box flows into the junction box and the right hole flows out of the junction boxB. 从接线盒的左侧孔流出接线盒,右侧孔流入接线盒. The left hole of the junction box flows out of the junction box and the right hole flows into the junction boxC. 从接线盒的中间孔流出接线盒,右侧孔流入接线盒. The middle hole of the junction box flows out of the junction box and the right hole flows into the junction boxD. 从接线盒的左侧孔流出接线盒,中间孔流入接线盒. The left hole of the junction box flows out of the junction box and the middle hole flows into the junction box
题目5单选题
正常情况下,接线盒中电流回路的连接片,( ). Under normal conditions, the connector of the current circuit in the junction box, ( )A. 上连接片处于连接状态,下连接片处于断开状态 The upper connector is connected, and the lower connector is disconnectedB. 上连接片处于断开状态,下连接片处于连接状态 The upper connector is disconnected and the lower connector is connectedC. 上连接片处于连接状态,下连接片也处于连接状态D. 上连接片处于断开状态,下连接片也处于断开状态 The upper connector is connected, and the lower connector is also connected
题目6单选题
三相三线电能计量装置与三相四线电能计量装置比较,缺少了( ). Compared with three-phase four wire electric energy metering device, three-phase three wire electric energy metering device lacks ( )A. 零线、B相电压线和电流线 Zero line, phase B voltage line and current lineB. 零线和B相电压线 Zero line and B phase voltage lineC. 零线和B相电流线 Zero line and B phase current lineD. B相电流线和电压线 B phase current line and voltage line
题目7单选题
电气工作人员在10kV配电装置上工作,其正常活动范围与带电设备的最小安全距离为( ). Electrical workers work on 10kV power distribution equipment, and the minimum safe distance between their normal activity range and live equipment is ( )A. 0.15mB. 0.35mC. 0.5mD. 0.7m
题目8单选题
不属于无线公网信道的是( ). The one that does not belong to the wireless public network channel is ( )A. GPRSB. CDMAC. GSMD. 230M无线信道 230M Wireless channel
题目9单选题
通信设备既可发送信息,同时也可接收信息的通信方式称为( ). The communication mode that the communication equipment can send and receive information is called ( )A. 单工通信 Simplex communicationB. 半单工通信 Half simplex communicationC. 全双工通信 Full duplex communicationD. 半双工通信 Half duplex communication
题目10单选题
目前光纤通信中,光纤中传输的是( ). At present, ( ) is transmitted in optical fiber communicationA. 红外线 infraredB. 紫外线 ultraviolet raysC. 微波 microwaveD. 激光 laser
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