【单选题】
【单选】 小容量配电所高压侧通常采用隔离开关 -熔断器或跌落式熔断器、 ___ 等主接线形式。
A. 隔离开关
B. 负荷开关 -熔断器
C. 熔断器
查看试卷，进入试卷练习
微信扫一扫，开始刷题
相关试题
【单选题】
【单选】 供电电压允许偏差规定 ,35kV 及以上电压供电的 ,电压正、负偏差绝对值之和不超过额定电压 ___。
【单选题】
【单选】 工作接地的接地电阻一般不应超过 ___ Ω。
【单选题】
【单选】 电力系统中的各级电压线路及其联系的各级 ___, 这一部分叫做电力网 ,或称电网。
【单选题】
【单选】 电源电动势的大小等于外力克服电场力把单位正电荷在电源内部 ___ 所做的功。
A. 从正极移到负极
B. 从负极移到正极
C. 从首端移到尾端
【单选题】
【单选】 在电阻并联的电路中 ,电路的电流等于 ___ 。
A. 各并联支路电流的平均值
B. 各并联支路的电流
C. 各并联支路的电流之和
【单选题】
【单选】 星形连接时三相电源的公共点叫三相电源的 ___ 。
【单选题】
【单选】 线圈中感应电动势的大小 ,与线圈的匝数 ___ 。
【单选题】
【单选】 在正弦交流电路中 ,电压、电流、电动势都是随时间 ___ 。
A. 非周期性变化的
B. 恒定不变的
C. 按正弦规律变化的
【单选题】
【单选】 电路处于 ___ 状态时 ,电路中的电流会因为过大而造成损坏电源、烧毁导线 ,甚至造成火灾等严重事故。
【单选题】
【单选】 对于正弦交流电 ,最大值等于有效值的 ___ 倍。
【单选题】
【单选】 磁场中磁力线在某区域的密度与该区域的磁场强弱 ___ 。
【单选题】
【单选】 电流的方向规定为导体中 ___ 运动的方向。
【单选题】
【单选】 下列关于保护间隙特点描述正确的是 ___ 。
A. 容易造成接地短路故障
B. 灭弧能力强
C. 保护性能好
【单选题】
【单选】 管型避雷器由 ___ 三部分组成。
A. 产气管、内部电极和外部间隙
B. 产气管、内部间隙和外部间隙
C. 产气管、内部间隙和外部电极
D. 产气管、内部电极和外部电极
【单选题】
【单选】 屋顶上单支避雷针的保护范围可按保护角 ___ 确定。
【单选题】
【单选】 ___ 对电气设备和电力系统安全运行危害极大。
A. 额定线电压
B. 系统最高电压
C. 过电压
【单选题】
【单选】 在高杆塔增加绝缘子串长度 ,线路跳闸率 ___ 。
【单选题】
【单选】 检修工作时凡一经合闸就可送电到工作地点的断路器和隔离开关的操作手把上应悬挂 :___。
A. 止步,高压危险
B. 禁止合闸 ,有人工作
C. 禁止攀登 ,高压危险
【单选题】
【单选】 运行值班人员在室内进行巡回检查 ,如高压设备发生接地时 ,不得接近故障点 ___ 以内。
【单选题】
【单选】 紧急事故处理时可不需填写 ___, 但应事后将有关事项记入值班日志 ,并及时汇报。
A. 第一种工作票
B. 第二种工作票
C. 倒闸操作票
【单选题】
【单选】 线路验电应逐相进行。 同杆架设的多层电力线路验电时 ,先___, 先验下层后验上层。
A. 验低压
B. 验高压或低压
C. 验低压后验高压
【单选题】
【单选】 检修工作地点 ,在工作人员上下铁架和梯子上应悬挂 :___ 。
A. 从此上下
B. 在此工作
C. 止步,高压危险
【单选题】
【单选】 所有断路器 ,隔离开关均断开 ,在有可能来电端挂好地线 ,说明设备处于 ___ 状态。
【单选题】
【单选】 工作监护人一般由 ___ 担任。
A. 工作负责人
B. 工作票签发人
C. 工作许可人
【单选题】
【单选】 隔离开关可拉、合 35kV 容量为 ___ 及以下的空载变压器。
A. 800kV
B. 1000kV
C. 3150kV
【单选题】
【单选】 触头断开后 ,触头之间如果 ___, 则电路实际上未被切断。
A. 有电压存在
B. 电弧已熄灭
C. 有电弧存在
【单选题】
【单选】 断路器的额定开断电流表明了断路器的 ___ 。
A. 长期允许最大工作电流
B. 灭弧能力
C. 绝缘水平
【单选题】
【单选】 FW5-10 负荷开关的含意是 ___ 。
A. 额定电压 10kV 户外型负荷开关
B. 额定电压 5kV 户外型负荷开关
C. 额定电压 10kV 户内型负荷开关
【单选题】
【单选】 交流高压真空接触器广泛应用于 ___ 等领域电气设备的控制。
【单选题】
【单选】 SF6 断路器的特点之一是 ___ 。
A. 开断电流大
B. 断口耐压低
C. 开断电流小
【单选题】
【单选】 交流高压真空接触器 -熔断器组合电器当一相或多相熔断器熔断时在 ___ 作用下 ,可实现自动分闸。
A. 熔断器撞击器
B. 电动力
C. 继电保护构
【单选题】
【单选】 在开关电器中 ,气体吹动电弧的方法为纵吹时 ,气体吹动方向与电弧轴线相 ___ 。
【单选题】
【单选】 弹簧储能操动机构是在合闸时 ,___ 释放已储存的能量将断路器合闸。
【单选题】
【单选】 交流高压真空接触器由 ___ 实现分闸。
A. 弹簧储能操动机构
B. 分闸弹簧
C. 手动操动机构
【单选题】
【单选】 通常要求真空断路器的触头材料具有的性能之一是 ___ 。
A. 耐弧性强
B. 导热性能差
C. 绝缘性能强
【单选题】
【单选】 与真空断路器连接的引线导线弛度应该 ___。
【单选题】
【单选】 SF6 断路器是用 ___ 作为绝缘介质和灭弧介质。
A. 液态 [图片 s_f_6.pn]
B. [ 图片 s_f_6.pn] 气体
C. [ 图片 s_f_6.pn] 分解的低氟化硫
【单选题】
【单选】 小电流真空灭弧室一般采用 ___ 触头。
【单选题】
【单选】 电气设备相位漆标识的黄、绿、红颜色分别代表 ___相位。
【单选题】
【单选】 额定电压是指高压断路器正常工作时所能承受的电压等级 ,它决定了断路器的 ___ 。
推荐试题
【多选题】
Storage capabilities be populated in what two ways? (Choose two.)___
A. The administrator can use tags to describe capabilities.
B. Default capabilities are provided by vCenter Server.
C. Datastores can advertise their capabilities through VAAI.
D. Datastores can advertise their capabilities through VASA.
【多选题】
In network troubleshooting it is important to know what upstream switch the ESXi host is connected to. Which two features does ESXi provide to help identify the upstream switch? (Choose two.)___
A. Promiscuous mode
B. DPM
C. LLDP
D. CDP
【多选题】
Virtual Volumes supports which three VMware features? (Choose three.)___
A. Instant Clones
B. Distributed Resource Scheduler
C. Linked Clones
D. vMotion
E. Storage Distributed Resource Scheduler
【多选题】
vSphere DRS helps to balance virtual machines with available resources in a vSphere cluster. What three types of resources can be taken into account for balancing? (Choose three.)___
A. CPU
B. physical NIC saturation of an ESXi host
C. virtual NIC saturation of a virtual machine
D. RAM
E. storage latency
【多选题】
Which three design requirements must be satisfied to enable RAID-6 objects in a VMware vSAN cluster? (Choose three.)___
A. vSAN Advanced license or higher
B. vSAN stretched cluster
C. at least six hosts contributing storage
D. deduplication and compression
E. all flash configuration
【多选题】
When using "Cluster resource percentage" for host failover capacity in vSphere HA Admission Control, the total resource requirements are calculated from which two values? (Choose two.)___
A. Total vCPUs assigned to each VM.
B. Average CPU usage on each VM over time.
C. Memory reservations on each VM.
D. Total memory assigned to each VM.
E. Average active memory on each VM over time.
F. CPU reservations on each VM.
【多选题】
Which are four attributes of the Active vCenter HA node? (Choose four)___
A. It uses the vCenter HA network to communicate with the Witness node.
B. It constantly replicates vPostgres data with the Witness node.
C. It uses a public IP address for the management interface.
D. It runs the active vCenter Server Appliance instance.
E. It uses the vCenter HA network for replication of data to the Passive node.
F. It provides a quorum to protect against split-brain situations.
【多选题】
Which are two vCenter Server two-factor authentication methods? (Choose two.)___
A. RSA SecurID
B. Smart Card
C. SAML
D. Symantec VIP
【多选题】
An administrator is creating VMkernel adapters on an ESXi 6.5 host and wants to create separate VMkernel adapters for every type of traffic in the default TCP/IP stack. Which three types of traffic can be explicitly enabled on a separate VMkernel adapter? (Choose three.)___
A. Virtual SAN traffic
B. NFS traffic
C. vMotion traffic
D. vSphere HA traffic
E. Fault Tolerance logging traffic
【多选题】
When migrating a Windows vCenter Server 6.0 to the vCenter Server Appliance 6.5, which two will be migrated by default? (Choose two.)___
A. Local Windows OS users and groups
B. Configuration
C. Custom ports
D. FQDN
E. Historical and Performance data
【多选题】
Which three types of Content Libraries exist within vSphere 6.5? (Choose three.)___
A. Remote Content Library
B. Published Content Library
C. Local Content Library
D. Shared Content Library
E. Subscribed Content Library
【多选题】
An administrator cannot enable multi-processor Fault Tolerance (SMP-FT) for a virtual machine. Which are two possible causes for this? (Choose two.)___
A. The virtual machine is running on a vSAN datastore.
B. The Fault Tolerance network is using a 10Gbit uplink.
C. The virtual machine has 6 vCPUs assigned.
D. The virtual machine has a 1TB VMDK attached.
E. The virtual machine has snapshots present.
【多选题】
Which two statements are true for Predictive DRS? (Choose two.)___
A. It balances resource utilization for virtual machines with unpredictable utilization patterns.
B. It integrates DRS with vRealize Operations Manager to balance workloads for virtual machines before resource utilization spikes occur.
C. It balances resource utilization based on a threshold's algorithm that runs each night.
D. It determines the best placement and balance of virtual machines based on a threshold's algorithm that runs each night in vCenter Server 6.5 Database.
【多选题】
Which two situations could cause a virtual machine to appear with (orphaned) appended to its name? (Choose two.)___
A. if a host failover is unsuccessful
B. if a virtual machine was removed from vCenter Server's inventory
C. if a virtual machine was deployed from template, and the template has been deleted
D. if a virtual machine is unregistered directly on the host
【多选题】
Which three requirements are needed to apply RAID 5 or RAID 6 erasure coding on a vSAN 6.2 or 6.5 object? (Choose three.)___
A. on Disk Format 3.0
B. Hybrid vSAN
C. All Flash vSAN
D. vSAN Advanced License
E. Stretched Cluster Configurations
【多选题】
An administrator sees the following error in the log files: Which two events could be the source of the error message? (Choose two.)___
A. vCenter Server failure
B. VXLAN failure
C. Disk array failure
D. Network failure
E. ESXi host failure
【多选题】
An administrator is attempting to access an ESXi host via the DCUI but is unable to do so. Which could be two possible causes? (Choose two.)___
A. The host in Qhas no out-of-band management capability (i.e. iLO/iDRAC).
B. The SSH service is disabled on the host.
C. Strict lockdown mode is enabled on the host.
D. Normal lockdown mode is enabled and the administrator is a member of the
E. xception User list.
【多选题】
Which two permissions are required to migrate a virtual machine with Storage vMotion? (Choose two.)___
A. Network > Move Network
B. Virtual Machine > Inventory > Move
C. Resource > Migrate powered on virtual machine
D. Datastore > Allocate Space
【多选题】
Which are three supported storage requirements for vCenter Server HA? (Choose three.)___
A. NFS
B. RDM
C. vSAN
D. VMFS
E. JBOD
【多选题】
Which are the two network requirements for a VMware vSAN 6.5 cluster? (Choose two.)___
A. Multicast must be enabled on the physical switches and routers that handle vSAN traffic.
B. vSAN requires IPv6 only.
C. All hosts must have a dedicated 40GbE NIC.
D. The vSAN network supported IPv4 or IPv6.
E. vSAN requires IPv4 only.
【多选题】
Which three prerequisites must be in place prior to enabling secure boot for a virtual machine? (Choose three.)___
A. VirtualMachine.Config.Settings privileges
B. an encrypted USB drive
C. Virtual Hardware version 13 or later
D. Virtual Hardware version 12 or later
E. EFI firmware
【多选题】
A user is given the "Virtual machine user (sample)" role in a vSphere 6.x environment. Which three permissions would the user be able to perform? (Choose three.)___
A. Reset a virtual machine.
B. Power on a virtual machine.
C. Move a host into a cluster.
D. Configure CD media.
E. Migrate a virtual machine with Storage vMotion.
【多选题】
Which three are supported upgrade processes for ESXi host? (Choose three.)___
A. using vSphere Auto Deploy
B. using a TFTP server
C. using Update Manager
D. using an
E. SXCLI command
【多选题】
When enabling Storage DRS on a datastore cluster, which three components are enabled as a result? (Choose three.)___
A. Space load balancing among datastore within the datastore cluster.
B. Initial placement for virtual disks based on space and I/O workload.
C. I/O load balancing among datastores within the datastore cluster.
D. Queue Depth alerting on disks within the datastore cluster.
E. Data de-duplication within the datastore cluster.
【多选题】
What are two features introduced in Network I/O Control version 3? (Choose two.)___
A. Bandwidth reservation per traffic type
B. Network resource pools
C. CoS tagging
D. Bandwidth guarantee to virtual machines
【多选题】
Which two correct virtual machine advanced configuration parameters will accomplish this? (Choose two.)___
A. isolation.device.edit.disable = “FALSE”
B. isolation.device.edit.disable = “TRUE”
C. isolation.device.connectable.disable = “FALSE”
D. isolation.device.connectable.disable = “TRUE”
【多选题】
Which three statements are correct regarding booting an ESXi Host from Fibre Channel SAN? (Choose three.)___
A. Direct connect topology is supported.
B. Each host must have its own boot LUN.
C. ESXi hosts do not require local storage.
D. Multipathing to a boot LUN on an active-passive array is supported.
E. Hosts can share one common boot LUN.
【多选题】
Which two tasks should a vSphere administrator perform if the vmkernel log reports VMFS metadata errors? (Choose two.)___
A. contact VMware technical support
B. reformat the datastore
C. check the device with VOMA
D. ignore the messages
【多选题】
Which two statements are true for a vCenterServer user account that is used for vSphere Data Protection (VDP)? (Choose two.)___
A. The user account must be assigned with Administrator role.
B. The password for the user account cannot contain spaces.
C. The user account should be created in the Single Sign-On domain
D. The user account cannot inherit required permissions from a group role.
【多选题】
Which three storage protocols are supported by Virtual Volumes? (Choose three.)___
A. FCIP
B. FCoE
C. iSCSI
D. NFS v3
E. NFS v4
【多选题】
A vSphere administrator observes a CPU spike on one of the web servers (view the Exhibit.) Which two statements can describe the cause of this activity? (Choose two.)___
A. The network packet size is too large.
B. VMware Tools is not installed.
C. Disk latency is present on the datastore.
D. The network packet size is too small.
【多选题】
Which three operations can cause VMFS metadata updates? (Choose three.)___
A. Restarting a VM using the guest OS.
B. Launching a VM console.
C. Migrating a VM with vMotion.
D. Powering a VM on or off.
E. Expanding a VMFS datastore.
【多选题】
*What two services run on all nodes in a vCenter Server HA cluster? (Choose two.)___
A. vmware-vmon
B. vmware-vpostgres
C. vmare-rbd-watchdog
D. vmware-vcha
【多选题】
Which two statements are true regarding Auto Deploy in version 6.5? (Choose two.)___
A. Auto Deploy can be configured and managed via PowerCLI.
B. Auto Deploy can be configured and managed via the vSphere Client.
C. Auto
D. eploy can be configured and managed via the vSphere Web Client.
【多选题】
What three options can improve network performance for a virtual machine? (Choose three.)___
A. MLD
B. TSO
C. NetFlow
D. LRO
E. SR-IOV
【多选题】
Which two storage technologies are supported for MSCS? (Choose two.)___
A. NFS
B. VAAI
C. iSCSI
D. FC
【多选题】
When upgrading a VMware vSAN cluster to version 6.5, which two tasks must be completed to comply with upgrade requirements and VMware-recommended best practices? (Choose two.)___
A. Use RVC to upgrade the hosts.
B. Use the latest available ESXi version.
C. Back up all VMs.
D. Use only the “Full data migration” maintenance mode option.
【多选题】
What two enhancements are in VMFS6 but not in VMFS5? (Choose two.)___
A. Support for 4k native disks
B. Support for 512e disks
C. GPT storage device partitioning
D. Automatic space reclamation
【多选题】
Which two statements describe why a vSphere DRS cluster would report load imbalance? (Choose two.)___
A. The configured migration threshold is too high.
B. The configured migration threshold is too low.
C. DRS is configured for Partially Automated.
D. Enhanced vMotion Compatibility (EVC) is enabled.
【多选题】
A vSphere Administrator must ensure that vCenter Server service is running in a domain user account rather than Local System Account. To accomplish this, the user account should have which two permissions? (Choose two.)___
A. Log on as a service.
B. Act as part of the operating system.
C. Log on as a batch job.
D. Log on locally.
