皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【简答题】
有一PWM变换器供电直流调速系统:电动机参数 , , , r/min,电枢电阻 Ω,PWM变换器的放大倍数 ,电源内阻 Ω。要求系统满足调速范围D=20,静差率 。 (1)计算开环系统的静态速降 和调速要求所允许的闭环静态速降 。 (2)采用转速负反馈组成闭环系统,试画出系统的原理图和静态结构图。 (3)调整该系统参数,使 时, ,则转速负反馈系数 应该是多少? (4)计算放大器所需的放大倍数。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案：
举一反三
【单选题】The one who buy insurance is called ( )
A.
an insurance company
B.
a broker
C.
the insured
D.
an insurer
查看完整题目与答案
【简答题】What is one obvious presupposition of a speaker who says; Where did he buy the beer? Your watch is broken. We regret buying that car.
查看完整题目与答案
【单选题】在计划新企业时,知道一定量的销售能带来多少收入,叫做_____。
A.
销售风险预测
B.
销售计划预测
C.
销售收入预测
D.
销售成本预测
查看完整题目与答案
【单选题】This is the one ______ I wanted to buy. [     ]
A.
which
B.
that
C.
who
D.
when
查看完整题目与答案
【单选题】The one who buy insurance is called ( ).
A.
the insurance company
B.
the broker
C.
the insurer
D.
the insured
查看完整题目与答案
【单选题】用符号 “IT” 表示 ( ) 的公差。
A.
尺寸精度
B.
形状精度
C.
位置精度
D.
表面粗糙度直角槽
查看完整题目与答案
【单选题】30A. It had been taken by the police. B. It had been moved to the next block. ###
A.
30 A. It had been taken by the police.
B.
It had been moved to the next block.
C.
It had been stolen by someone.
D.
It had been parked at a wrong place.
查看完整题目与答案
【单选题】用符号“IT”表示( )的公差。
A.
尺寸精度
B.
形状精度
C.
位置精度
D.
表面粗糙度
查看完整题目与答案
【单选题】根据以下信息,采用 中点法 计算酒店房间的需求价格弹性。 若P = $70,则Q d = 5000 若P = $90,则Q d = 3000
A.
0.5
B.
1.4
C.
2.0
D.
3.0
查看完整题目与答案
【判断题】标准公差等级是指确定尺寸精确程度的等级。 用符号 IT 和数值表示, IT 表示国际公差,数字表示公差(精度)等级代号。
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】The one who buy insurance is called ( )
A.
an insurance company
B.
a broker
C.
the insured
D.
an insurer
查看完整题目与答案
【简答题】What is one obvious presupposition of a speaker who says; Where did he buy the beer? Your watch is broken. We regret buying that car.
查看完整题目与答案
【单选题】在计划新企业时,知道一定量的销售能带来多少收入,叫做_____。
A.
销售风险预测
B.
销售计划预测
C.
销售收入预测
D.
销售成本预测
查看完整题目与答案
【单选题】This is the one ______ I wanted to buy. [     ]
A.
which
B.
that
C.
who
D.
when
查看完整题目与答案
【单选题】The one who buy insurance is called ( ).
A.
the insurance company
B.
the broker
C.
the insurer
D.
the insured
查看完整题目与答案
【单选题】用符号 “IT” 表示 ( ) 的公差。
A.
尺寸精度
B.
形状精度
C.
位置精度
D.
表面粗糙度直角槽
查看完整题目与答案
【单选题】30A. It had been taken by the police. B. It had been moved to the next block. ###
A.
30 A. It had been taken by the police.
B.
It had been moved to the next block.
C.
It had been stolen by someone.
D.
It had been parked at a wrong place.
查看完整题目与答案
【单选题】用符号“IT”表示( )的公差。
A.
尺寸精度
B.
形状精度
C.
位置精度
D.
表面粗糙度
查看完整题目与答案
【单选题】根据以下信息,采用 中点法 计算酒店房间的需求价格弹性。 若P = $70,则Q d = 5000 若P = $90,则Q d = 3000
A.
0.5
B.
1.4
C.
2.0
D.
3.0
查看完整题目与答案
【判断题】标准公差等级是指确定尺寸精确程度的等级。 用符号 IT 和数值表示, IT 表示国际公差,数字表示公差(精度)等级代号。
A.
正确
B.
错误
查看完整题目与答案
参考解析：
知识点：
题目纠错 0
发布
创建自己的小题库 - 刷刷题