欧阳老师 发表于 2020-9-14 08:47:04

东大20秋学期《机械设备电气控制（含PLC）》在线平时作业1百分

20秋学期《机械设备电气控制（含PLC）》在线平时作业1
1.[单选题] <p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">下列图形是（</span><span style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US"></span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">）的图形符号</span></p><p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img style="WIDTH: 51px; HEIGHT: 103px" width="142" height="257" alt="" src="http://file.open.com.cn/ItemDB/77902/6fd5b692-681f-4ed1-af34-bd6edfa83754/2010102911139875.JPG" /></span></p>
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    A. 熔断器
    B.热继电器
    C.电流继电器
    D.电压继电器
    答:——A——
2.[单选题] <p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">下列图形是（</span><span style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US"></span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">）的图形符号</span></p><p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="688" height="208" alt="" src="http://file.open.com.cn/ItemDB/77902/be7ad6e5-8db8-4694-a96c-9a9d51fa0deb/2010102911111574.JPG" /></span></p>
    A.接触器
    B.中间继电器
    C.时间继电器
    D.速度继电器
    答:——C——
3.[单选题] <p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">下列图形是（</span><span style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US"></span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">）的图形符号</span></p><p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="211" height="96" alt="" src="http://file.open.com.cn/ItemDB/77902/f183f63d-e651-41a9-978e-8f2d418e37c4/20101029111616709.JPG" /></span></p>
    A.熔断器
    B.热继电器
    C.电流继电器
    D.电压继电器
    答:——B——
4.[单选题] <p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">下列图形是（</span><span style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US"></span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">）的图形符号</span></p><p><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="308" height="146" alt="" src="http://file.open.com.cn/ItemDB/77902/2b6c64af-5b68-482d-b198-8d6b3ea414db/2010102911918320.JPG" /></span></p>
    A.接触器
    B.中间继电器
    C.时间继电器
    D.速度继电器
    答:————
5.[单选题] 数控机床电气控制系统由（ ）、进给伺服系统、主轴伺服系统、机床强电控制系统等组成。
    A.液压系统
    B.弱电控制系统
    C.硬件系统
    D.数控装置
    答:————
6.[单选题] 从组成结构形式上，PLC可以分为（）
    A.整体式、模块式
    B.独立式、协同式
    C.整体式、独立式    更多答案进ap5u.com   或联系q761296021
    D.模块式、独立式
    答:————
7.[单选题] 数控机床中电力拖动系统的运行状态有静止、起动、稳速、加速、减速和（）等运动状态。
    A.悬停
    B.匀加速
    C.匀减速
    D.制动
    答:————
8.[单选题] 永磁交流伺服电动机采用的调速方法为（）
    A.改变定子绕组极对数
    B.改变转差率
    C.改变电枢电流
    D.改变电源频率
    答:————
9.[判断题] 开环控制精度取决于步进电机及传动机构的精度，因而精度较差。
    A.错误
    B.正确
    答:————
10.[判断题] 永磁交流伺服电动机起动容易，能够自起动。
    A.错误
    B.正确
    答:————
11.[判断题] 直流电动机电磁转矩增加时转速也随之上升。
    A.错误
    B.正确
    答:————
12.[判断题] 直流电动机降低电源电压时获得的人工机械特性的斜率不变。
    A.错误
    B.正确
    答:————
13.[判断题] 在光电式、接触式和电磁感应式脉冲编码器中，电磁感应式编码器优于其它两种。
    A.错误
    B.正确
    答:————
14.[判断题] 脉冲编码器是一种旋转式脉冲发生器。
    A.错误
    B.正确
    答:————

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