【判断题】
无论在变压器投入运行的过程中,还是在停用的过程中,均应先接通各侧中性点接地隔离开关
A. 对
B. 错
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解析
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相关试题
【判断题】
变压器油枕油位计的+40C油位线是表示环境温度在+40℃时的油标准位置线
A. 对
B. 错
【判断题】
变压器的变比是指变压器在满负荷工况下一次绕组电压与二次绕组电压的比值
A. 对
B. 错
【判断题】
变压器在进行送电及充电合闸试验以前,要测各回路的绝缘电阻
A. 对
B. 错
【判断题】
变压器取气时,必须两人同时进行
A. 对
B. 错
【判断题】
6KV电动机的绝缘电阻,应用2500V等级的兆欧表来测量,其绝缘电阻值不低于1 MΩ/kV(6 MΩ)
A. 对
B. 错
【判断题】
厂用一般电动机断笼条多发生在频繁启动或重载启动时
A. 对
B. 错
【判断题】
电动机可以在额定电压变动-5% ~ +10%范围内运行,其额定出力不变
A. 对
B. 错
【判断题】
电动机在额定出力运行时,相间电压不平衡不超过10%
A. 对
B. 错
【判断题】
电动机在运行时有两个主要力矩:使电动机转动的电磁力矩;由电动机带动的机械负载产生的阻力力矩
A. 对
B. 错
【判断题】
电动机着火可以使用泡沫灭火器或砂土灭火
A. 对
B. 错
【判断题】
为防止电动机过载运行,所以要配置熔断器
A. 对
B. 错
【判断题】
电动机的速断保护的动作电流,应按躲过正常负荷电流来定
A. 对
B. 错
【判断题】
改变三相交流电动机旋转方向,只要任意对调其二根电源线即可
A. 对
B. 错
【判断题】
电动机的滑动轴承温度不能超过65℃,滚动轴承不能超过75℃
A. 对
B. 错
【判断题】
鼠笼电动机转子断条,有起动时冒火花、静子电流时大时小,振动现象
A. 对
B. 错
【判断题】
异步电动机的启动电流一般为电动机额定电流的4~7倍
A. 对
B. 错
【判断题】
对于电动机负载,通常按1.5~2.5倍电动机额定电流选择熔体的额定电流
A. 对
B. 错
【判断题】
厂用变压器停电时,必须先断高压侧开关,后断低压侧开关
A. 对
B. 错
【判断题】
厂用变压器应由带保护的高压侧向低压侧充电,任何情况下,严禁变压器由低压侧向高压侧全电压充电
A. 对
B. 错
【判断题】
厂用电动机对启动次数的规定:在正常情况下,允许冷态状态启动3次,每次时间间隔不小于5分钟
A. 对
B. 错
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选择指示剂原则是同一种类型的滴定,选用同样的指示剂
A. 对
B. 错
【判断题】
酸碱滴定,夜班使用甲基橙、酚酞作指示剂时,应比白班多加一些,以利于终点的判断
A. 对
B. 错
【判断题】
使用各种不同的洗液洗涤仪器时,一定要把上一种洗液除去后再用另一种,以免相互作用,生成的产物更难清洗
A. 对
B. 错
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易燃溶剂加热时,必须在水浴或沙浴中进行,避免明火
A. 对
B. 错
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剧毒废液应做解毒处理,不可直接倒入下水道
A. 对
B. 错
【判断题】
每瓶试剂必须标明名称、规格、浓度和配制时间
A. 对
B. 错
【判断题】
倒取试剂时,应手握瓶签一侧,以免试剂滴流侵蚀瓶上标签
A. 对
B. 错
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型号为“201”的树脂属强酸性苯乙烯系阳离子交换树脂
A. 对
B. 错
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天然水的碱度主要是HCO3ˉ的盐类所组成
A. 对
B. 错
【判断题】
提高再生剂用量,可以提高树脂的再生程度。所以再生时,再生剂加的越多越好
A. 对
B. 错
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一般来说,阴树脂的化学稳定性比阳树脂差
A. 对
B. 错
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强酸树脂比弱酸树脂容易再生
A. 对
B. 错
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再生剂的纯度对交换剂的再生程度和出水水质影响不大
A. 对
B. 错
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中和池内的中和反应属离子互换反应,生成难电离的水,反应速度很快,因此不需要搅动
A. 对
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将废酸液由pH=3中和至pH=7所用碱量是废酸由pH=5中和至pH=7所用碱量的2倍
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采用凝结水处理的机组允许凝汽器有较大程度的泄漏
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循环冷却水系统中的含盐量或离子浓度是不变化的
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发电机内冷却水的电导率越大,说明水质越好
A. 对
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化学除氧是电厂的主要除氧方式
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锅炉给水加氨是为了除去水中残余的氧
A. 对
B. 错
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A virtual machine is connected on a distributed port group where the average bandwidth configured in the traffic shaping policy is 100 Mbps. The VM network adapter is configured with a reservation of 200 Mbps. What is the VM’s effective bandwidth?___
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What are two reasons why a datastore in a Storage DRS cluster cannot enter maintenance mode?(Choose two.)___
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What two methods are used to configure VMware vSphere Storage I/O Control shares and limits? (Choose two.)___
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ESXi 6.5 introduces VMFS6, which supports both 512e and 512n devices. What three configurations are supported when using these devices? (Choose three.) ___
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A vSphere Administrator observes that the Primary VM configured with Fault Tolerance is executing slowly. After further investigation, it is determined that the Secondary VM is on an overcommitted ESXi host. What two methods will correct the problem? (Choose two.)___
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