Equal power factors on paralleled AC generators are maintained by an automatic ________.A.governor control switchB.reverse power relayC.reverse current relayD.voltage regulator

题目

Equal power factors on paralleled AC generators are maintained by an automatic ________.

A.governor control switch

B.reverse power relay

C.reverse current relay

D.voltage regulator

相似考题

1.Female employees are not satisfied with the ( ) against them and are fighting for equal pay to that of males.A. prejudiceB. violenceC. hatredD. power

2.You plan to have a larger moving window size for the default system-defined moving window baseline because you want to use the adaptive threshold. Which statement factors in this consideration while increasing the size of the moving window?（）A. The collection level for the AWR should be set to BASICB. The moving window size must be less than Undo RetentionC. The moving window size should be greater than the Automatic Workload Repository (AWR) retention periodD. The moving window size should be equal to or less than the Automatic Workload Repository (AWR) retention period

3.When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .A.pick up more of any increase in loadB.pick up less of any increase in loadC.share an equal amount of any increase in loadD.drop an equal amount of any decrease in load

4.( ) can provide an asynchronous link between two ac electric power system with different nominal frequencies.A.The HVDC (high voltage DC) transmissionB.The EHV (extra-high voltage) AC transmissionC.The AC distributionD.Generators

参考答案和解析
正确答案：D
更多“Equal power factors on paralleled AC generators are maintained by an automatic ________.A. ”相关问题

  • 第1题：

    Which of the following factors is the MOST likely cause of a power supply fan failure?()

    A. Extreme temperature variances

    B. Extreme humidity variances

    C. Power stability fluctuations

    D. Excessive dust accumulation


    参考答案：D

  • 第2题：

    He asserted that nuclear power was a safe and non-polluting energy source.

    A:maintained
    B:recommended
    C:considered
    D:acknowledged

    答案：C
    解析：
    本句意思：他认为核能是安全、无污染的能源。assert意为“主张，认为”，与consider（以 为，认为）意思相近。maintain维持；recommend推荐；acknowledge（承认）。

  • 第3题：

    Which of the following factors is the MOST likely cause of a power supply fan failure？（）

    • A、 Extreme temperature variances
    • B、 Extreme humidity variances
    • C、 Power stability fluctuations
    • D、 Excessive dust accumulation

    正确答案:D

  • 第4题：

    单选题
    Which is a function of the voltage regulators used with AC generators?（）
    A

    To cut out generators when they are no longer required

    B

    To cut in additional generators automatically as required

    C

    To divide the KW load equally between generators operating in parallel

    D

    To divide reactive current between generators operating in parallel


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    In determining that the（）of the navigational watch is adequate to ensure that a proper look-out can continuously be maintained，the master shall take into account all relevant factors.
    A

    disposition

    B

    composition

    C

    reposition

    D

    position


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    While paralleling two AC generators using synchronizing lamps only, both lamps will go dark when the generators are （）.
    A

    running at the same speed

    B

    grounded

    C

    of the same polarity

    D

    in phase


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    Equal power factors on paralleled AC generators are maintained by an automatic （）.
    A

    voltage regulator

    B

    reverse power relay

    C

    reverse current relay

    D

    governor control switch


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
    A

    Sensitivity

    B

    Power

    C

    Speed droop

    D

    Compensation


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer mating in the （）
    A

    slow direction, just before the 12 o'clock position

    B

    fast direction, just after the 12 o'clock position

    C

    fast direction, just before the 12 o'clock position

    D

    slow direction, just after the 12 o'clock position


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    When paralleled, AC generators must have the same （）
    A

    frequency

    B

    number of phases

    C

    phase rotation

    D

    All of the above


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    AC and DC generators are similar in that they （）
    A

    both generate alternating voltages

    B

    both rectify the voltage before delivery

    C

    are constructed at the same physical size for the same kilowatt rating

    D

    both supply three-phase power


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    You plan to have a larger moving window size for the default system-defined moving window baseline because you want to use the adaptive threshold. Which statement factors in this consideration while increasing the size of the moving window?（）
    A

    The collection level for the AWR should be set to BASIC

    B

    The moving window size must be less than Undo Retention

    C

    The moving window size should be greater than the Automatic Workload Repository (AWR) retention period

    D

    The moving window size should be equal to or less than the Automatic Workload Repository (AWR) retention period


    正确答案： C
    解析： 暂无解析

  • 第13题：

    While paralleling two AC generators using synchronizing lamps only, both lamps will go dark when the generators are______.

    A.running at the same speed

    B.grounded

    C.of the same polarity

    D.in phase


    正确答案：D

  • 第14题：

    You plan to have a larger moving window size for the default system-defined moving window baseline because you want to use the adaptive threshold. Which statement factors in this consideration while increasing the size of the moving window?（）

    • A、The collection level for the AWR should be set to BASIC
    • B、The moving window size must be less than Undo Retention
    • C、The moving window size should be greater than the Automatic Workload Repository (AWR) retention period
    • D、The moving window size should be equal to or less than the Automatic Workload Repository (AWR) retention period

    正确答案:D

  • 第15题：

    单选题
    The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the （）.
    A

    voltage regulators

    B

    field rheostats

    C

    reverse power relays

    D

    prime mover governors


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    The power factor at which a paralleled AC generator operates is usually adjusted by the （）.
    A

    connected load

    B

    prime mover speed

    C

    field excitation

    D

    generators rated voltage


    正确答案： C
    解析： 暂无解析

  • 第17题：

    单选题
    A diesel driven emergency generator is prevented from being paralleled with the ships service generators by （）
    A

    an electrical interlock system

    B

    an automatic paralleling trip switch

    C

    the synchronizing oscilloscope

    D

    the reverse current relay


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.
    A

    pick up more of any increase in load

    B

    pick up less of any increase in load

    C

    share an equal amount of any increase in load

    D

    drop an equal amount of any decrease in load


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    Why is it desirable to operate paralleled AC generators at the same power factor?（）
    A

    Circulating currents are kept to a minimum

    B

    Field excitation losses are kept to a minimum

    C

    Generator rotors will have a lesser tendency to hunt

    D

    Because a power factor increase will decrease kilowatt output


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.
    A

    greater

    B

    better

    C

    smaller

    D

    less


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    A diesel generator has just been paralleled with an AC turbo-generator, but the load can not be properly divided.This could be caused by（）
    A

    an incorrect diesel generator governor speed droop adjustment

    B

    a faulty reverse power relay within the main circuit breaker assembly

    C

    unsynchronized isochronous load distribution adjustments

    D

    a different speed setting on each unit


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    If two AC generators are operated in parallel, the load is distributed evenly by（）
    A

    a rheostat

    B

    a balancing coil

    C

    changing field excitation

    D

    adjusting the governor settings


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    A constant output voltage from an AC generator is maintained by the （）.
    A

    prime mover governor

    B

    exciter generator

    C

    voltage regulator

    D

    reverse power relay


    正确答案： B
    解析： 暂无解析

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