【判断题】
DC600V供电列车运用列车绝缘要求是用1000V兆欧表测量,在相对湿度大于85℅时,线间电阻≥0.6兆欧,线地间电阻≥0.3兆欧
A. 对
B. 错
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答案
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解析
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相关试题
【判断题】
DC600V供电列车运用单车绝缘要求是用1000V兆欧表测量,在相对湿度小于60℅时,线间电阻≥4兆欧,线地间电阻≥2兆欧
A. 对
B. 错
【判断题】
DC600V供电列车运用单车绝缘要求是在相对湿度小于85℅时,线间电阻≥1兆欧,线地间电阻≥0.5兆欧
A. 对
B. 错
【判断题】
AC380V供电列车运用列车绝缘要求是用500V兆欧表测量,在相对湿度小于60℅时,线间电阻≥2兆欧,线地间电阻≥1兆欧
A. 对
B. 错
【判断题】
AC380V供电列车运用列车绝缘要求是用500V兆欧表测量,相对湿度大于85℅时,线间电阻≥0.38兆欧,线地间电阻≥0.22兆欧
A. 对
B. 错
【判断题】
AC380V供电列车运用单车绝缘要求是用500V兆欧表测量,在相对湿度大于60℅时,线间电阻≥4兆欧,线地间电阻≥2兆欧
A. 对
B. 错
【判断题】
AC380V供电列车运用单车绝缘要求是用500V兆欧表测量,在相对湿度小于85℅时,线间电阻≥1兆欧,线地间电阻≥0.5兆欧
A. 对
B. 错
【判断题】
DC600V供电列车车厢的车下逆变电源单个功率为35KW
A. 对
B. 错
【判断题】
DC600V供电列车充电机控制电源为DC600V
A. 对
B. 错
【判断题】
DC600V供电列车轴温报警器塞拉门和呼唤系统均采用DC48V供电
A. 对
B. 错
【判断题】
DC600V供电列车车厢的充电机功率为3.5KW
A. 对
B. 错
【判断题】
DC600V供电客车单相逆变器控制电路为DC600V供电
A. 对
B. 错
【判断题】
DC600V供电客车烟火报警器供电电源为DC48V
A. 对
B. 错
【判断题】
DC600V供电客车应急灯、PLC等重要负载由本车直流110V供电
A. 对
B. 错
【判断题】
DC600V供电客车车下电源箱、电茶炉等负载的控制电源由母线直流110V供电
A. 对
B. 错
【判断题】
DC600V供电列车由电力机车牵引,每隔70km就有一个分相区
A. 对
B. 错
【判断题】
DC600V供电列车采用采用经部审查的AC380V板式电热器;加不可恢复式超温保护装置
A. 对
B. 错
【判断题】
电磁炉使用电加热加热原理,使导磁体在磁场内产生涡流发热而达到加热食物的目的
A. 对
B. 错
【判断题】
不要在电磁炉工作时直接关断路器,应先把火力调节钮置“0”档,然后再关断路器,这样有利于延长电磁炉的使用寿命
A. 对
B. 错
【判断题】
PLC、触摸屏电路额定工作电压是直流48V
A. 对
B. 错
【判断题】
WG型网关用于铁路客车TKDT-1T1型配电柜,其中包括PLC网关、轴温报警器网关、防滑器网关、烟火报警器网关
A. 对
B. 错
【判断题】
Ⅰ路、Ⅱ路均有电,设定车厢号后,PLC按照均衡供电原则,奇数号车厢选择Ⅱ路供电、偶数号车厢选择Ⅰ路供电
A. 对
B. 错
【判断题】
当电源电压值恢复正常,通过人为操作解除故障保护或电源重新供电,通过PLC检测后,PLC自动转换回原供电回路,负载恢复全载运行
A. 对
B. 错
【判断题】
用万用表欧姆挡测二极管极性时,应记住其“-”插孔是接自附电池的负极,而“+”插孔是接自正极
A. 对
B. 错
【判断题】
客车空调装置中电动机回路接有熔断器,主要用来作过载保护
A. 对
B. 错
【判断题】
在带负荷情况下,误拉开关后,应迅速纠正,立即合上
A. 对
B. 错
【判断题】
备用发电车每15天必须启动机组,检查技术状态,并按规定保养,备用客车须定期对蓄电池进行补充电
A. 对
B. 错
【判断题】
新造25T型客车上线运行前,须进行通电,带载试运行,试运行距离原则上不得少于1000km
A. 对
B. 错
【判断题】
运行客车鉴定中,发现蓄电池极耳硫化,可定位二级车
A. 对
B. 错
【判断题】
中修时,餐车电冰箱控制箱应进行分解
A. 对
B. 错
【判断题】
制冷系统循环的四个过程分别是:蒸发、压缩、冷凝、再冷过程
A. 对
B. 错
【判断题】
影响绝缘老化的因素很多,主要是热的因素
A. 对
B. 错
【判断题】
运用客车鉴定中,发现灯具整套松动,可定为三级车
A. 对
B. 错
【判断题】
TG型蓄电池放电的终止电压为0V
A. 对
B. 错
【判断题】
大修后,在外温35℃时,开机1h后冰箱内的温度应在-5℃以下
A. 对
B. 错
【判断题】
串联的阻抗越多,其总阻抗越大
A. 对
B. 错
【判断题】
段修时,发电机悬吊装置的吊销须探伤
A. 对
B. 错
【判断题】
时间继电器有电磁式、电动式、空气式和电子式几种型式
A. 对
B. 错
【判断题】
露点温度等于湿球温度
A. 对
B. 错
【判断题】
冷凝风机和通风机运转不正常会影响制冷效果
A. 对
B. 错
【判断题】
空调系统的控制电路电压应选取较高值,交流200V或直流110V,以提高工作的可靠性
A. 对
B. 错
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What is the command for updating an ESXi host?___
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A VM folder contains VM1 and VM2. Group A has permission to power on virtual machines, defined on the VM folder and its children. Group B has permission to power off virtual machines, defined on the VM folder and its children. If a user is a member of Groups A and B, what will be the user’s effective permission on VM1 and VM2?___
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【单选题】
vSphere 6.5 introduced MAClearning capabilities for VMware’s virtual switches. What three benefits will it provide? (Choose three.)___
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What is the default pathing policy for most active-active arrays?___
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【单选题】
Which command will show the iSCSI sessions on a ESXi 6.5 host?___
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【单选题】
Which of the following is not a parameter for traffic filtering or marking?___
A. virtual port ID
B. Protocol
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A vSphere administrator wants to enable a virtual machine with Secure Boot, but in VM setting, Secure Boot option was not found under Boot Options. What could be the cause?___
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B. The virtual machine has missing drivers.
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D. VMware Tools is not upgraded.
【单选题】
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?___
A. 200 Mbps
B. 100 Mbps
C. 150 Mbps
D. 400 Mbps
【多选题】
What are two reasons why a datastore in a Storage DRS cluster cannot enter maintenance mode?(Choose two.)___
A. Storage latency is too high to allow Storage DRS initiate Storage vMotion.
B. Storage DRS is configured for a VMFS3 datastore.
C. Storage
D. RS is disabled on the virtual disk.