单选题Self-excited a-cgenerator with "error operated" voltage control systems draw the full excitation power for the machine terminalsThis dispenses with the current transformers, reactors and capacitors necessary for accurate compounding, but renders the ex

题目
单选题
Self-excited a-cgenerator with "error operated" voltage control systems draw the full excitation power for the machine terminalsThis dispenses with the current transformers, reactors and capacitors necessary for accurate compounding, but renders the excitation system vulnerable to variations in its output voltageWhich of the following is correct about the generator mentioned according to the sentences above ().
A

It consumes no excitation power

B

It has current transformers

C

Components are needed for accurate compounding

D

Its excitation system is vulnerable to voltage variations


相似考题
更多“Self-excited a-cgenerator with "error operated" voltage cont”相关问题
  • 第1题:

    WhichstatementsistrueaboutForeignExchangeStation(FXS)portsonarouter?()

    A.theFXSinterfaceallowsananalogconnectiontobedirectedatthepublicswitchedtelephonenetwork(PSTN’s)centraloffice

    B.theFXSinterfaceconnectdirectlytoastandardtelephone,faxmachine,orsililardeviceandsuppliesring,voltage,anddialtone

    C.theFXSinterfaceconnectdirectlytoanIPphoneandsuppliesring,voltage,anddialtone

    D.theFXSinterfaceconnectdirectlytoISDNvoicechannels


    参考答案:B

  • 第2题:

    One of the benefits of the new model is that it is easier()than the old one.

    • A、operating
    • B、to be operated
    • C、to operate
    • D、operated

    正确答案:C

  • 第3题:

    每个T-CONT用Alloc-ID来标识。每个T-CONT的流量由多个VP或Port组成。而每个T-CONT中的VP或Port可以是来自任意ONU的。T-CONT是业务流量的集合体,通过Alloc-ID标识,一种T-CONT能承载多种数据类型。


    正确答案:错误

  • 第4题:

    GPON系统中,T-CONT的标识符为:()。


    正确答案:Alloc-ID

  • 第5题:

    GPON标准中定义了()种T-CONT类型。


    正确答案:5

  • 第6题:

    发动机点火和启动电门有哪些选择位置?()

    • A、1,2
    • B、1,BOTH,2
    • C、GND,OFF,CONT,FLT
    • D、GND,AUTO,OFF,CONT,FLT

    正确答案:D

  • 第7题:

    单选题
    The output voltage of a three-phase alternator is regulated by the ().
    A

    AC voltage to the armature

    B

    AC voltage to the field

    C

    DC voltage to the armature

    D

    DC voltage to the field


    正确答案: C
    解析: 暂无解析

  • 第8题:

    单选题
    Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal?()
    A

    Low voltage protection circuit

    B

    Non-renewable link fuse

    C

    Renewable link fuse

    D

    Low voltage release circuit


    正确答案: A
    解析: 暂无解析

  • 第9题:

    单选题
    Automatic fire dampers in ventilation systems are operated by use of().
    A

    remotely operated valves

    B

    fusible links

    C

    C02 system pressure switches

    D

    heat or smoke detectors


    正确答案: D
    解析: 暂无解析

  • 第10题:

    单选题
    Self-excited a-cgenerator with "error operated" voltage control systems draw the full excitation power for the machine terminalsThis dispenses with the current transformers, reactors and capacitors necessary for accurate compounding, but renders the excitation system vulnerable to variations in its output voltageWhich of the following is correct about the generator mentioned according to the sentences above ().
    A

    It consumes no excitation power

    B

    It has current transformers

    C

    Components are needed for accurate compounding

    D

    Its excitation system is vulnerable to voltage variations


    正确答案: B
    解析: 暂无解析

  • 第11题:

    单选题
    A fuse that blows often should be replaced only with a fuse of ().
    A

    the recommended current and voltage rating

    B

    higher current and voltage rating

    C

    higher current and lower voltage rating

    D

    lower current and higher voltage rating


    正确答案: B
    解析: 暂无解析

  • 第12题:

    单选题
    Class C EPIRBs are().
    A

    manually activated and operate on maritime (VHF) channels

    B

    automatically activated and operate on maritime (VHF) channels

    C

    manually operated and detected by satellite

    D

    automatically operated and detected by satellite


    正确答案: C
    解析: 暂无解析

  • 第13题:

    故障电压(fault voltage)


    正确答案: 因绝缘损坏在故障点和参考地之间出现的电压。

  • 第14题:

    NVH测试中,我们目前使用的噪声振动传感器信号输入模式为()。

    • A、Voltage AC
    • B、Voltage DC
    • C、ICP

    正确答案:C

  • 第15题:

    你是公司网管,网络中包括两个域,cont.com和mk.cont.com,你在DNS服务器上为这两个域创建了独立的zone,然后你添加了一个从DNS服务器,这台服务器还是域控制器,你将cont.com转为AD集成zone,并只允许安全更新。你发现未被授权的计算机将它们注册到了mk.cont.com,你查看zone的属性发现这个zone允许非授权动态更新。你还发现没有安全动态更新的选项。你应该如何做()

    • A、在两个zone之间进行zone传递
    • B、重新创建mk.cont.com为从zone
    • C、重新创建cont.com为主zone
    • D、将mk.cont.com转换为AD集成zone

    正确答案:D

  • 第16题:

    GPON接入中,T-cont实际就是(),OLT的PON下对应每个ONU共有()个T-cont。


    正确答案:缓存;7

  • 第17题:

    According to Ohm’s Law, which of the following is correct?()

    • A、As voltage increases, resistance decreases
    • B、As amperage decreases, resistance decreases
    • C、As resistance decreases, amperage increases
    • D、As resistance increases, voltage increases

    正确答案:C

  • 第18题:

    发动机点火选择电门有哪些选择位置?()

    • A、1,2
    • B、1,BOTH,2
    • C、GND,OFF,CONT,FLT
    • D、GND,AUTO,OFF,CONT,FLT

    正确答案:B

  • 第19题:

    单选题
    Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?()
    A

    the direct acting relief valve is used for controlling lower flows and pressure

    B

    the pilot operated relief valve is used for controlling higher flows and pressure

    C

    the pilot operated relief valve is used for controlling lower flows and pressure

    D

    the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve


    正确答案: C
    解析: 暂无解析

  • 第20题:

    单选题
    The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage ().
    A

    droop

    B

    drop

    C

    dip

    D

    regulation


    正确答案: B
    解析: 暂无解析

  • 第21题:

    单选题
    Automatic fire dampers in ventilation systems are operated by a().
    A

    remote operated valve

    B

    fusible link

    C

    CO2 system pressure switch

    D

    heat or smoke detector


    正确答案: B
    解析: 暂无解析

  • 第22题:

    单选题
    Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the ()
    A

    manual position

    B

    bus neutral position

    C

    raise voltage position

    D

    transfer position


    正确答案: D
    解析: 暂无解析

  • 第23题:

    单选题
    ONU选择性接收数据的依据是()
    A

    T-CONT ID

    B

    目的MAC地址

    C

    ONT ID

    D

    Gemport ID


    正确答案: C
    解析: 暂无解析

  • 第24题:

    单选题
    The voltage developed by an AC generator is controlled by varying the ()
    A

    speed of the prime mover

    B

    AC excitation to the field

    C

    DC excitation to the field

    D

    DC excitation of the voltage regulator


    正确答案: C
    解析: 暂无解析