试题与答案

为了节省电缆,可将直流回路中的电缆的备用芯用于交流回路。

题型:判断题

题目:

为了节省电缆,可将直流回路中的电缆的备用芯用于交流回路。

答案:

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下面是错误答案,用来干扰机器的。

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题型:完形填空

短文填词 (共10小题,每小题1分,满分10分)

Westerners often invite people to dinner. Have you ever heard

____________ any customs about it? Usually the host will ask the            1. ________________

guest ___________ of time, because Westerners like making plans.            2. ________________

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which would ___________ (否则) make your dinner party not as           10________________

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题型:选择题
如图所示,理想变压器原、副线圈的匝数比为10:1,b是原线圈的中心接头,电压表V和电流表A均为理想电表.从某时刻开始在原线圈c、d两端加上交变电压,其瞬时值表达式为u=220sin100πt(V).下列说法正确的是(  )

A.当单刀双掷开关与a连接时,电压表的示数为22V

B.当单刀双掷开关与b连接时,电压表的示数为11V

C.当单刀双掷开关与a连接,滑动变阻器触头P向上移动的过程中,电压表的示数不变,电流表的示数变大

D.单刀掷开关由a扳向b时(滑动变阻器触头P不动),电压表和电流表的示数均变大

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