【单选题】
63.三相异步电动机再生制动时，将机械能转换为电能，回馈到___。
A. 负载
B. 转子绕组
C. 定子绕组
D. 电网
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答案
D
解析
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76.电气控制线路图测绘的方法是___；先画输入端，再画输出端；先画主干线，再画各支路；先简单后复杂。
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B. 先画电气，再画机械
C. 先画控制电路，再画主电路
D. 先画主电路，再画控制电路
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7.M7130型平面磨床控制电路中串接着转换开关QS2的常开触点和___。
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B. 欠电流继电器KUC的常闭触点
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8.M7130型平面磨床控制线路中导线截面最粗的是___。
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B. 连接电源开关QSl的导线
C. 连接电磁吸盘YH的导线
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9.M7130型平面磨床控制线路中导线截面最细的是___。
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14.M7130型平面磨床的三台电动机都不能启动的原因之一是___。
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15.M7130型平面磨床中砂轮电动机的热继电器动作的原因之一是___。
A. 电源熔断器FUl烧断两个
B. 砂轮进给量过大
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D. 接插器X2接触不良
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16.M7130型平面磨床中电磁吸盘吸力不足的原因之一是___。
A. 电磁吸盘的线圈内有匝问短路
B. 电磁吸盘的线圈内有开路点
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17.M7130型平面磨床中三台电动机都不能启动，电源开关QSl和各熔断器正常，转换开关Qs2和欠电流继电器KUC也正常，则需要检查修复___。
A. 照明变压器T2
B. 热继电器
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D. 接插器)(2
【单选题】
18.M7130型平面磨床中三台电动机都不能启动，转换开关QS2 JE常，熔断器和热继电器也正常，则需要检查修复___。
A. 欠电流继电器KUC
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【单选题】
19.M7130型平面磨床中，砂轮电动机的热继电器经常动作，轴承正常，砂轮进给量正常，则需要检查和调整___。
A. 照明变压器
B. 整流变压器
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20.M7130型平面磨床中，电磁吸盘退磁不好使工件取下困难，但退磁电路正常，退磁电压也正常，则需要检查和调整___。
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