【单选题】
三电平方式逆变器与两电平方式逆变器比较，优点是（ ）。___
A. 控制简单
B. 直流环节电压高、谐波少
C. 成本低
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相关试题
【单选题】
脉冲整流器较相控整流器的优点是（ ）。___
A. 功率因素高
B. 可以实现整流和有源逆变
C. 谐波含量大
【单选题】
CRH2A统型动车组司机室侧门采用充气密封式折页门，门板强度能够承受的均布载荷为（ ）。___
A. 2kpa
B. 4kpa
C. 6kpa
D. 8kpa
【单选题】
以下对通风系统作用表述不准确的是（ ）___
A. 提供新鲜空气
B. 对空气温度和湿度有较强的调节功能
C. 维持车厢内压力
D. 保证车内空气清洁
【单选题】
以下设备不属于通风系统的是？（ ）___
A. 风道
B. 压缩机
C. 空气净化设备
D. 压力波控制装置
【单选题】
CRH2A统型动车组主电路中脉冲整流及逆变器都采用（ ）___
A. 二电平方式
B. 三电平方式
C. 非脉冲式逆变器
D. 脉冲式逆变器
【单选题】
CRH2A统型动车组转向架基础制动方式是（ ）___
A. 空气制动
B. 空液转换液压制动
C. 抱闸制动
D. 以上都不对
【单选题】
（ ）是二系悬挂中的关键部件，是影响车辆运行平稳性的关键因素。___
A. 空气弹簧
B. 抗侧滚扭杆
C. 差压阀
D. 高度调整阀
【单选题】
连续式列控系统、点式列控系统及点-连式列控系统的主要区别在于（ ）。___
A. 车地信息传输方式不同
B. 速度控制模式不同
C. 闭塞方式不同
D. 自动化程度不同
【单选题】
CTCS根据系统配置按功能划分为（ ）个等级。___
【单选题】
CRH2A动车组牵引控制为（ ）控制方式。___
A. VVVF
B. VVFF
C. VFFF
D. FFVV
【单选题】
CRH2A统型动车组制动系统分为（ ）。___
A. 制动控制和制动执行系统
B. 制动控制和制动操作系统
C. 制动执行系统和基础制动装置
D. 电气制动和控制管路系统
【单选题】
动车组辅助空压机手动启动正确方式为（ ）。___
A. 用铁棒按下辅助空压机接触器触点
B. 用绝缘工装按下辅助空压机接触器触点
C. 用手按下辅助空压机接触器触点
D. 用对讲机天线按下辅助空压机接触器触点
【单选题】
CRH2A统型动车组一等座椅间距（ ）mm。___
A. 600
B. 980
C. 1060
D. 1160
【单选题】
液压传动系统由动力部分、执行部分、控制部分和（ ）组成。___
A. 辅助部分
B. 液压泵
C. 液压缸
D. 单向阀
【单选题】
列车头罩处检测距离用的红外线反射板处于（ ）。___
A. 仅1号车
B. 仅 8号车
C. 1号车和8号车
D. 1号车或8号车
【单选题】
CRH2A统型动车组防滑控制时，不需要处理的是（ ）。___
A. 车轴速度检测
B. 电机转差率检测
C. 速度差计算
D. 滑行率计算
【单选题】
车辆信息控制装置内置（ ）年的日历。___
【单选题】
某正弦电路电压为u=220sin(100t+150),其中100表示（ ）。___
【单选题】
车辆信息控制装置光节点间传送速度（ ）。___
A. 2.5 Mbps
B. 3.0 Mbps
C. 25 Mbps
D. 30 Mbps
【单选题】
正弦量的三要素包含振幅、角频率和（ ）。___
【单选题】
下列不属于三相异步电动机制动方式的为（ ）。___
A. 能耗制动
B. 反接制动
C. 发电反馈制动
D. 涡流制动
【单选题】
CRH2A动车组主空压机润滑油更换基准：（ ）①粘度：新油的±15％ ②总酸值：0.5mgKOH／g ③水分：0.5容积% ④不溶解量（树脂量）：0.1重量%___
A. ①②③
B. ①②③④
C. ②④
D. ①③④
【单选题】
CRH2A动车组主空压机润滑油更换后观察油位时，启动主空气压缩机停止（ ）分钟后，油位在MIN～MAX之间。___
【单选题】
CRH2A动车组进行自动过分相装置检测划磁铁试验中强迫状态试验时：打开信号处理器电源，在1号车司机室插入主控钥匙，制动手柄置“快速”位，方向手柄置“前”位，输入‘Ⅰ端向前’信号，用试验磁铁快速、一次性划过的感应接收器为( ）。___
A. T1和T2
B. T1和T3
C. T2和T4
D. T3和T
【单选题】
CRH2A(统型)动车组烟火报警系统探测器污染状态检查时当探测器阀值超过（ ）%时，表明探头污染，更换此探测器过滤棉并清洗探测器。___
A. 100
B. 110
C. 120
D. 130
【单选题】
CRH2A动车组内端门检测中对承载部件的导轨用（ ）进行润滑.___
A. 乐泰8104硅脂
B. 150＃透平油
C. Molykote G-n润滑油
D. 道康宁557
【单选题】
CRH2A动车组转向架更换后落成检查，测定车体与车轮轮缘的上下间隔为（ ）mm以上。___
【单选题】
CRH2A动车组更换AG37速度传感器之前，在新传感器的连接器处对其阻值进行确认，针号1～2间电阻值为( ）Ω（20℃时）.___
A. 60±10
B. 33±4
C. 40±10
D. 27±3
【单选题】
下列对电动空气压缩机本体描述不正确的是（ ）。___
A. 本装置的结构时为用法兰盘拼合压缩机与电动机作为整体结构。
B. 且用内装的联轴节来传达动力。
C. 且用外装的联轴节来传达动力。
D. 弹簧力大小可以通过安装在调整阀下部的调整螺钉来调整。
【单选题】
CRH380A统型动车组中引用了车载信息装置和自诊断技术，该系统由两部分构成，它还有附属设施，不包括( )。___
A. 对讲机
B. 监控显示器及显示控制装置
C. 车内信息显示器
D. IC读卡器
【单选题】
CRH2A统型动车组一、二级检修作业中，接地继电器检查及清洁时，测量GR3的701B～700A间输入电压应为( )以下。___
A. AC4 V
B. AC5 V
C. AC6 V
D. AC7 V
【单选题】
CRH380A统型动车组温水箱检查测试时用（ ）兆欧表进行电源端子和非充电部之间的绝缘测试。___
A. 100V
B. 500V
C. 1000V
D. 1500V
【单选题】
CRH2A统型动车组采用空心车轴设计，它的中心通孔直径为（ ）。___
A. 50mm
B. 60mm
C. 70mm
D. 80mm
【单选题】
CRH2A统型动车组二级修，自动过分相装置检测作业时，使用万用表欧姆档分别测量其插孔1和2，3和4，6和7以及19和20之间的直流阻值，电阻值正常范围应在（ ）。___
A. 250～350Ω
B. 350～450Ω
C. 450～550Ω
D. 550～650Ω
【单选题】
CRH2A统型动车组二级修，自动过分相装置输出主断“断”“合”信号后，在( )内无法再接收信号，因此每项试验完成后，需等待( )或重新开机自检后，再进行下一项试验。___
A. 1min,1 min
B. 1 min,2 min
C. 2 min,2 min
D. 2 min,3 min
【单选题】
CRH2A统型动车组二级修，车内压力释放阀检查时，投入主控，制动手柄移动至“快速”位，确认总风压力在( )以上。___
A. 350KPa
B. 430KPa
C. 530KPa
D. 590KPa
【单选题】
CRH2A统型动车组，无外部电源供电时，回送时间不超过（ ）小时，超过时限速5 km/h。___
【单选题】
CRH2A统型动车组蓄电池单体的使用温度范围是（ ）之间无异常。___
A. －15℃～+45℃
B. －25℃～+45℃
C. －15℃～+55℃
D. －5℃～+45℃
【单选题】
CRH2A统型动车组，每台牵引电机的额定功率是（ ）___
A. 260kw
B. 300kw
C. 350kw
D. 400kw
【单选题】
CRH2A统型动车组转向架横梁主体采用钢管结构，内部作为（ ）的辅助空气室使用。___
推荐试题
【多选题】
When attempting to access a virtual machine, an administrator is unable to login using the vSphere credentials. What two options are probable causes of the authentication failure? (Choose two.)___
A. The vSphere credentials have not been granted permissions.
B. The vSphere credentials are granted read-only permissions.
C. The vSphere credentials are granted no-access permissions.
D. The vSphere credentials are not a member of the local administrator group.
【多选题】
An administrator is performing a scripted installation of ESXi 6.x. In which three locations does the script need to be? (Choose three.)___
A. PXE Server
B. HTTPS
C. FTP
D. NFS
E. VVOLs Datastore
【多选题】
In order for a company to meet regulatory requirements, all ESXi 6.x Hosts must be configured to direct logs to a syslog server. What are two ways ESXi hosts can configured for this action? (Choose two)___
A. Use the esxcli system syslog command.
B. Edit them in the ESXi host Advanced System Settings.
C. From the Syslog collector user interface of the Web Client.
D. Syslog logging is not available for
E. SXi Hosts.
【多选题】
Which three actions can be executed when an alarm is triggered? (Choose three.)___
A. Send an email.
B. Send an SNMP trap.
C. Run a script or command.
D. Run an Orchestrator workflow.
E. Send a trigger to syslog.
【多选题】
An administrator is attempting to power on a virtual machine, but is unable to do so. Which two reasons are probable causes of the failure? (Choose two.)___
A. Storage access to the virtual machine swap file has been lost.
B. One of the virtual machine VMDK files is locked.
C. Virtual machine is running CentOS 7.0 64-bit.
D. Virtual machine has Hyper-Threading enabled.
【多选题】
An administrator has configured a host profile so that ESXi 6.x hosts will point to the corporate NTP server for time synchronization. The NTP server is located at 10.0.30.213, but time has not been synchronized properly across the ESXi hosts. The administrator reviews Host Profile settings as shown in the Exhibit. Which two steps are required to resolve the issue? (Choose two.)___
A. Correct the NTP server IP address.
B. Check the host for host profile compliance.
C. Remediate the host based on the updated host profile.
D. Change the NTP server to the FQDN as IP Addresses are not supported.
【多选题】
An administrator is attempting to migrate a large Hadoop virtual machine using vMotion. The administrator notices a delay when the machine is quiesced. The Hadoop virtual machine is processing many transactions a second to an in-memory database. Which two actions would help reduce the amount of time needed to perform a vMotion on this virtual machine? (Choose two.)___
A. Use multiple NICs for the vMotion vmkernel port.
B. Use a 10Gbps Network card for the vMotion vmkernel port.
C. Add an additional management network to help transmit the data quicker.
D. Disable Fault Tolerance before performing the vMotion.
【多选题】
An administrator is installing a new network card in an ESXi 6.x host that is part of a vSphere cluster. When the host is placed into maintenance mode, the vSphere Web Client displays the progress bar at 2% for over 30 minutes. Which two are likely reasons for this occurrence? (Choose two.)___
A. Maintenance mode is unable to migrate all virtual machines from the host.
B. There is a large number of virtual machines that must be migrated from the host.
C. VMware High Availability is in the process of reconfiguring the cluster.
D. Each virtual machine on the
E. SXi host must be reconfigured to recognize the new adapter.
【多选题】
Which two events happen when Distributed Resource Scheduler (DRS) is disabled? (Choose two.)___
A. The cluster's resource pool heirarchy and affinity rules are re-established when DRS is turned back on.
B. The cluster's resource pool hierarchy and affinity rules are not re-established when DRS is turned back on.
C. The cluster's resource pools are removed from the cluster.
D. The cluster's resource pools are removed from the cluster and assigned to the hosts.
【多选题】
Which two networking connection types can be configured on a virtual switch? (Choose two.)___
A. Virtual machine portgroups
B. VMkernel services (such as NFS, iSCSI, or vMotion) to the physical network
C. Web services over the Management Network
D. NFS and FCoE storage services
【多选题】
An administrator creates a DRS cluster of eight ESXi 6.x hosts. There are 10 virtual machines balanced across the hosts. An attempt to place the first host into maintenance mode fails. What are two reasons that the host failed to enter maintenance mode? (Choose two.)___
A. The DRS cluster Automation Level is set to Partially Automated mode.
B. One of the virtual machines on the ESXi Host entering maintenance mode is configured with a DRS Host affinity rule Should run on hosts in group.
C. One of the virtual machines on the ESXi Host entering maintenance mode is configured with a DRS Host affinity rule Must run on hosts in group.
D. One of the virtual machines on the
E. SXi Host entering maintenance mode is configured with an individual Automation Level set to Partially Automated.
【多选题】
When modifying a vApp, which two vSphere entities can be added? (Choose two.)___
A. A resource pool
B. A network pool
C. A vApp
D. A folder
【多选题】
From which two locations in the inventory hierarchy can you deploy a virtual machine using a template? (Choose two.)___
A. Directly from the template.
B. From a compute resource.
C. From an existing virtual machine.
D. From a Datastore.
【多选题】
A company has decided to implement Virtual SAN within their vSphere 6.x environment. The Virtual SAN cluster will be composed of three ESXi 6.x hosts that are on the Virtual SAN Ready Node list. Each ESXi host includes: <Two SAS Controllers that support Passthrough Mode> < Four Solid State Drives (SSDs) 1TB in size each> <20 SAS Magnetic Disks (MDs) 1TB in size each> <The SSDs and MDs are evenly split between the two SAS controllers>. The company will pilot a Virtual SAN cluster utilizing VMware best practices while maximizing storage capacity. The Virtual SAN cluster will use Manual Mode. Which two Disk Group configurations would meet the stated configuration requirements? (Choose two.)___
A. 4 disk groups with 1 SSD and 5 MDs each
B. 2 disk groups with 1 SSD and 7 MDs each
C. 2 disk groups with 2 SSDs and 7 MDs each
D. 2 disk groups with 1 SSD and 10 MDs each
【多选题】
A physical Windows 2008 R2 Server is converted to a virtual machine using VMware vCenter Converter. Upon completion of the conversion and subsequent power on operation, the virtual machine fails to boot and the message below is observed in the Console of the virtual machine: <STOP 0x0000007B INACCESSIBLE_BOOT_DEVICE>. Which two potential issues may be causing this boot failure? (Choose two.)___
A. An incorrect SCSI controller was selected during conversion.
B. Incompatible software drivers were migrated into the virtual machine from the source machine.
C. The vmdk file backing the virtual machine was thick provisioned.
D. A snapshot was taken immediately after the conversion completed.
【多选题】
An administrator is configuring the Failover Order option on a vSphere Distributed Switch. Which two options should be used with IP-hash load balancing? (Choose two.)___
A. Active Uplinks
B. Standby Uplinks
C. Unused Uplinks
D. Override Failover Order
【多选题】
An administrator is configuring the Maximum Transmission Unit value on a vSphere Distributed Switch. Which two options are typical values for ESXi networking? (Choose two.)___
A. 1492
B. 1500
C. 9000
D. 9089
【多选题】
Which two configurable options apply to both virtual machine CPU and memory allocation? (Choose two.)___
A. Reservation
B. Shares
C. Resource Pool
D. Reserve All
【多选题】
When attempting to power on a Virtual Machine you observe the following error: <Cannot open the disk '/vmfs/volumes/volume/vm/vm-000002.vmdk' or one of the snapshot disks it depends on.> Which three actions will be the best solutions to address this problem? (Choose three.)___
A. Verify that the virtual machine's disk files are present.
B. Investigate the host and virtual machine log files.
C. Verify the vmdk descriptor files and if required, recreate them.
D. Delete the disk file preventing the power on operation.
E. Migrate or register the virtual machine to a different host.
【多选题】
An administrator has been tasked with enabling High Availability ___ on a cluster in a vSphere 6.x environment with default settings. The cluster configures properly and there are no errors. The next day when powering on a virtual machine, an error is presented: <Not Enough Failover Resources>. Which three scenarios are likely causes of this error message? (Choose three.)(CDE)
A. The default VM Monitoring Sensitivity is set too high.
B. There are not enough datastore heartbeat datastores configured by default.
C. The default slot size in the cluster is set too high.
D. There are virtual machines with large CPU reservations.
E. A host is in maintenance mode for a replacement of a failed Hard Drive.
【多选题】
vMotion can be performed between which three physical boundaries? (Choose three.)___
A. Between two vCenter Server Systems
B. Between two vSphere Distributed Virtual Switches
C. Between two vCenter Server Datacenter objects
D. Between two VMware NSX Layer 4 segments
E. Between two NFS datastores
【多选题】
An administrator configures vSphere Replication for a virtual machine and enables multiple point in time (PIT) instances under the recovery settings in the Configure Replication wizard. Which two statements are correct for vSphere Replication with multiple point in time instances enabled? (Choose two.)___
A. vSphere Replication retains a number of snapshot instances of the virtual machine on the target site based on the retention policy that you specify.
B. vSphere Replication uses the virtual machine's snapshot instances to define the target site Point in Time instance based on the retention policy that you specify.
C. vSphere Replication does not support virtual machines with snapshots.
D. vSphere Replication supports virtual machines with snapshots.
【多选题】
An administrator is virtualizing a physical application server and adding it to an existing multi-tiered vApp. The application license is currently tied to the physical NIC's MAC address, so the administrator needs to ensure the license will function properly in the virtual machine. Which two actions can the administrator take to satisfy this task? (Choose two.)___
A. Set the MAC address for the vNIC in the guest operating system.
B. Install the physical server's NIC into the ESXi host.
C. Configure the MAC address for the vNIC using the vSphere Web Client.
D. Assign the physical server NIC's MAC address in the vSphere Distributed Switch.
【多选题】
Which two Fibre Channel zoning options are supported with vSphere 6.x? (Choose two.)___
A. Single-Initiator
B. Single-Initiator-Single-Target
C. Multiple-Initiators-Single-Target
D. Multiple-Initiators-Multiple-Targets
【多选题】
An administrator is attempting to remove an ESXi 6.x host from a vSphere Distributed Switch (vDS). When the administrator attempts to remove the host, the following error is observed: <The resource '16' is still in use.> What three steps are needed to successfully remove the host from the switch? (Choose three.)___
A. Select Manage Ports on the vDS for the host.
B. Locate all ports currently in use on the vDS for the host.
C. Migrate or delete any vmkernel or virtual machine adapters associated with the switch.
D. Remove all network cards from the switch before trying to remove the host.
E. Create a standard switch for everything to be automatically be migrated to.
【多选题】
Which two Virtual SAN related actions might start resynchronization of virtual machine objects? (Choose two.)___
A. Editing a virtual machine storage policy to increase the number of replicas.
B. Editing a virtual machine storage policy to reduce the number of replicas.
C. Editing a virtual machine storage policy to increase the number of disk stripes.
D. Editing a virtual machine storage policy to reduce the number of disk stripes.
【多选题】
An administrator is troubleshooting basic network connectivity issues. Which two scenarios are potential issues that this administrator might face? (Choose two.)___
A. The vSwitch is not attached to the correct physical network.
B. The portgroup is not configured to use correct VLAN.
C. Traffic shaping is configured incorrectly.
D. Jumbo frames is configured incorrectly.
【多选题】
Which three items should be validated prior to installing ESXi 6.x? (Choose three.)___
A. Remote Storage has been disconnected.
B. Installation media is available.
C. Server hardware clock is set to UTC.
D. Storage has been partitioned with a VMFS volume.
E. Network cards have been setup to use Jumbo
F. rames.
【多选题】
An administrator is performing an interactive installation of ESXi 6.x. Which three options are available for installation? (Choose three.)___
A. DVD
B. USB
C. PXE
D. Scripted
E. Auto Deploy
【多选题】
After installation of a host in your test environment, you need to move it to production. The only major change that needs to be made is that the hostname of the server needs to change. What are two ways that an administrator can change the host name without editing configuration files on the host directly? (Choose two.)___
A. Login to the Direct Console User Interface and change it from here.
B. Edit the Default TCP/IP Configuration from the vSphere Web Client.
C. Use the Ruby vSphere Client to send a script to the ESXi host that updates the hostname.
D. Update the information in DNS and the
E. SXi host will automatically update with these changes.
【多选题】
An administrator has unsuccessfully attempted several times to install an Operating System inside a virtual machine. The administrator finds that the installation fails at random intervals. Which two actions can be taken to resolve this issue? (Choose two.)___
A. Verify the md5sum and if invalid, download the installation files again.
B. Attempt the installation an additional time.
C. Attempt to use a different installation media or installation method.
D. Create a new virtual machine and attempt the installation with the existing media.
【多选题】
VMware tools is failing to install on a Microsoft Windows virtual machine. What are two possible situations that would prevent the installation? (Choose two.)___
A. The VMware tools installation media is corrupt.
B. The incorrect Operating System was selected in the virtual machine options.
C. The software prerequisites have not been installed.
D. The prerequisite services have not been started.
【多选题】
As part of a multisite Single Sign-On (SSO) deployment what two steps are required to ensure that a change to one Single Sign-On instance is propagated to the other instances? (Choose two.)___
A. Schedule a Replication Task on the primary instance
B. Select the first instance during the installation of subsequent instances
C. During the installation of each instance choose Linked-Mode
D. Enable Synchronize to Active Directory on each instance
【多选题】
You need to add an object to an existing vApp using the vSphere Web Client. How is this accomplished?___
A. Create an Object Inside the vApp.
B. Add an Object to a vApp.
C. Add an Object to the
D. atastore the vApp is located in.
【多选题】
Which three steps must be taken to use vSphere Update Manager 6.x to upgrade an ESXi 5.5 host to vSphere 6.x? (Choose three.)___
A. Download an ESXi Image.
B. Configure the vSphere Update Manager Download Service.
C. Create a baseline and attach it to the ESXi Host.
D. Scan the vCenter Content Library for the
E. SXi Image.
【多选题】
Which two options would allow a database administrator, with no access to the vSphere infrastructure, to connect to a virtual machine? (Choose two.)___
A. Use the Virtual Machine Remote Console (VMRC).
B. Use Remote Desktop Protocol (RDP) to connect.
C. Ask the vSphere administrator to grant permission to access the console through vCenter Server.
D. Ask the vSphere administrator to grant permission to access with the Horizon View Direct Connect Client.
【多选题】
Which three are architecture components of vRealize Operations? (Choose three.)___
A. Identity Server
B. Administrative Server
C. Analytics Server
D. Database Server
E. Connection Broker
【单选题】
金克拉金克拉撒旦蒂萨里大儿童家爱丽丝打开就撒开绿灯技术的（）
A. 手动阀手动阀
B. 撒旦
C. 反对法
D. 第三方
【单选题】
金克拉金克拉撒退热贴开绿灯技术的（）
A. 是否
B. 阿斯顿
C. 撒旦
D. 感到反感
【单选题】
而非热舞法国会开绿灯技术的（）
A. 撒的
B. 热个股分化
C. 返回
D. 而我认为
