【判断题】【消耗次数:1】
起重机上采用的绕线式异步电动机为了满足起重机调速范围宽,调速平滑的要求,应采用转子串调速电阻?
正确
错误
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相关题目
【判断题】 绕线式转子三相异步电动机在转子中串电阻调速属于恒转矩调速。
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【单选题】 在转子回路串一变阻器调速只适用于绕线式异步电动机。
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【判断题】 绕线式异步电动机转子串电阻起动是为了增大起动转距。
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【判断题】 绕线式异步电动机增加转子电阻,转差率增加?
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【单选题】 下列()不属于异步电动机的调速方式。
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②  变转差率调速
③  变频调速
④  变极调速
【单选题】 以下可对异步电动机进行调速的方法是( )。
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②  改变电动机的供电频率
③  改变电压的相位
④  改变电动机转子绕组匝数
【单选题】 下列异步电动机调速方法属于转差功率消耗型的调速系统是 ()。
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②  串级调速
③  变极调速
④  变压变频调速
【单选题】 下列异步电动机调速方法属于转差功率不变型的调速系统是
①  A.降电压调速
②  B.串级调速
③  C.变极调速
④  D.变压变频调速
【判断题】 绕线式异步电动机转子电阻越大,机械特性越硬?
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随机题目
【多选题】 There are_____________ 45 tourists there.
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【多选题】 _____________ , he had to stay at home to look after her.
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【单选题】 I must____________ you that if you do this again you will be punished.
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【单选题】 The diplomat to____________ I spoke is my best friend.
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