84、普通电风扇扇头的摇头动作是由电动机驱动的，扇头的摇摆角度按国家标准规定：扇叶的直径为250mm
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倍压整流电路，这种倍压整流供电方式使变压器二次侧绕组匝数减少了（）。a1/5b 1/2c1/4d1/
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。a3.2vb 32v c320vd 4200v3、微波炉整流器是由高压电容和整流二极管组成一个半波
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）工作电流约为14a，阳极峰值电压在4000v以上，电流约为300ma，平均寿命1000-3000h
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保护器动作，切断电源以保护人身安全。a5mab10mac15mad20ma2、磁控管灯丝电压一般为（
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项填入括号中。每题2分共20分）1、在电热水器的漏电保护器中将（）确定为危险电流，超过这一数值时漏电
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定子铁心上的激磁绕组和转子上的电枢绕组为同一个电流。二、选择题（前5题为单选，后5题为多选，将正确选
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矩大，效率低。主要应用于老式台风扇、电唱机及一些家安平吧电产品的电动计时器中。10（）单相串激式电动机通过
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工作时，吸嘴处与外界大气之间的负压差。9、（）罩极式单相异步电动机的特点：结构简单、成本低廉但启动转
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相隔等空间角度，并采用种种方法使两绕安平吧组中的电流相位尽可能接近180度。8、（）吸尘器的真空度指吸尘器
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磁场，为了获得旋转磁场，得到启动转矩，通常在定子上另加一个辅助绕组（启动绕组）它与主绕组（运转绕组）
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现出的电阻率就越高；反之则电阻率就越低。7、（）由于单相交流电通过一个绕组只能产生一个脉动而不旋转的
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件能够吸附空气中的水分，当湿敏传感器处于不同湿度环境中时，湿度越高，吸安平吧附水分子数量就越多，多孔陶瓷呈
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塑性形变,而将其加热升温达到某一临界温度时,又能立即恢复到形变前的形状。6、（）典型的多孔陶瓷湿敏元
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定子绕组的主要作用是：通入交流电后产生安平吧旋转磁场。5、（）所谓形状记忆效应,就是合金在室温下被加工产生
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敏晶体管是一种新型的半导体热敏元件,它利用基极和发射级之间的电压变化来检测温度4、（）单相异步电动机
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动机，三相串激式电动机和永磁式直流电安平吧动机。2、（ ）ptc元件是一种负温度系数的热敏电阻。3、（）热
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及家用电动电热器具，一般只能使用三相交流电源或直流电源，所以在这些电器中使用的电动机主要是三相异步电
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号一二三四总分得分一、判断题（在前面括号中打 √或×每题1安平吧分共10分）1、（）家用电冰箱，空调器，以
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烟台职业学院2005 —2006学年第1学期期末考试电气专业（03电子）《 家电维修》试题 （a）题
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