【单选题】【消耗次数:1】
在速度负反馈单闭环调速系统中,当下列()参数变化时系统无调节能力。
A)放大器的放大倍数Kp
(B)负载变化
C)转速反馈系数
(D)供电电网电压
参考答案:
复制
纠错
相关题目
【单选题】 某负反馈放大器,由于外部因素影响,A的变化率为±10%,要求Af的变化率±0.1%,则反馈系数F=(   )。
①  0.01
②  0.099
③  0.1
④  0.99
【单选题】 在深度负反馈电路中,若反馈系数F减小一倍,闭环放大倍数Af将近( )。
①  增大一倍
②  减小一倍   
③  基本不变
④  不一定变化
【判断题】 带电流截止负反馈的转速闭环系统不是单闭环系统。
①  正确
②  错误
【单选题】 在双闭环系统中,由电网电压波动引起的转速变化会比单闭环系统小得多。
①  正确
②  错误
【单选题】 下列关于转速反馈闭环调速系统反馈控制基本规律的叙述中,错误的是.
①  只用比例放大器的反馈控制系统,其被调量仍是有静差的.
②  反馈控制系统可以抑制不被反馈环节包围的前向通道上的扰动.
③  反馈控制系统的作用是:抵抗扰动、服从给定
④  .系统的精度依赖于给定和反馈检测的精度
【单选题】 在系统中设置()调节器,分别引入转速负反馈和电流负反馈以调节转速和电流。
①  两个
②  三个
③  一个
【判断题】 负反馈放大电路的放大倍数AF= A/1+AF。
①  正确
②  错误
【判断题】 当电路引入深度负反馈时,放大倍数Af可以认为与原放大倍数A无关,它取决于反馈回路的反馈系数F的大小。
①  正确
②  错误
【判断题】 对于深度负反馈放大电路的放大倍数AF=1/F。
①  正确
②  错误
【判断题】 若放大电路的放大倍数为负,则引入的反馈一定是负反馈。()
①  正确
②  错误
随机题目
【单选题】 The subject was so ____ that Tom became very ____ in it.
①  interesting, interesting
②  interested, interested
③  interested, interesting
④  interesting, interested
【单选题】 I’11 send you my address ____ I find somewhere to live. ?
①  although ?
②  as ?
③  while ?
④  once ?
【单选题】 6. Our discussion ____ a wide range of subjects.
①  conveyed
②  concluded
③  covered
④  filled
【单选题】 It was when Tom got to the office ____ the telephone rang.
①  which
②  that
③  how
④  what
【单选题】 —How long____ you ____the library book? —For three days.
①  have--borrowed
②  have--kept
③  did--borrow
④  were--kept
【单选题】 My uncle, Sam, ____ a manager of the firm. ?
①  has just been made ?
②  has just made ?
③  is just made ?
④  is just being made?
【单选题】 ____, he is not capable of teaching.
①  A teacher as he is
②  Teacher as he is
③  As a teacher
④  As a teacher he is
【单选题】 It happened to be very cold____ the morning of our sports meet. ?
①  at ?
②  of ?
③  on ?
④  with?
【单选题】 He didn’t keep on asking me the time any longer as he had had his watch ____.?
①  repaired ?
②  to repair ?
③  repairing ?
④  repair?
【单选题】 Raw material is ____ we are badly in need of.
①  what
②  whether
③  that
④  how