天津职业技术师范大学
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- 正弦稳态电路中,电流超前电压-90°的元件是电感
- 叠加定理适用于任何电路电流、电压和功率的叠加。
- 受控源在电路分析中的作用,和独立源完全相同。
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- 正弦稳态电路中单口网络的电抗为负值,说明该单口网络为电容性质。
- 电容具有隔直通交作用。
- 受控源是一种双口电阻元件。
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- 电容在某一时刻的储能只与该时刻的电压有关。
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- 电感元件上的电压相位滞后其电流90o,电容元件上的电流相位滞后其电压90o,这个结论( )成立。
- 正弦稳态电路中,若感性负载消耗的功率为72kW,功率因数为0.6,则此负载的无功功率为( )。
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- 采用并联电容器提高功率因数后,原负载支路中电流 。
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- 在一阶RC电路中,若C不变,R越大,则换路后过渡过程越 。
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- 串联RL电路中,电感上的电压( )。
- 任意一个相量乘以j相当于该相量( )。
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A:对 B:错
答案:错
A:对 B:错
答案:对
A:错 B:对
答案:错
A:错 B:对
答案:错
A:对 B:错
答案:对
A:对 B:错
答案:对
A:对 B:错
答案:对
A:对 B:错
答案:对
A:对 B:错
答案:错
A:对 B:错
A:10 B:1.5 C:1 D:15
A:① B:③ C:② D:④
A:②
B:①
C:③ D:④
A:② B:③ C:① D:④
A:③ B:② C:① D:④
A:①
B:③ C:② D:④
A: B: C: D:其它选项都不对
A:(1~5)V B:(1~4)V C:0~5V D:0~4V
A:15.3A B:其它选项都不对 C:30.6A D:7.65A
A:①
B:④ C:② D:③
A:电感电流和电压、电容电流和电压为关联参考方向时 B:根本不可能 C:电容、电感为非线性元件时 D:电感电流和电压、电容电流和电压为非关联参考方向时
A:-54kVar B:-96kVar C:54kVar D:96kVar
A:980W B:945W C:1980W D:1890W
A:不能确定 B:增大;不变 C:减小;增大
D:增大;减小
A:11.713kW 11.713 kvar B:其它选项都不正确 C:4.685kW 11.713 kvar
A:3V B:4V C:9V D:5V
A:③ B:④
C:①
D:②
A:变大 B:变小 C:不变 D:不确定
A:③ B:① C:④ D:②
A:2.5 B:5 C:2 D:0
A:其它选项都不对 B:15J C:20J D:25J
A:62.82J B:31.41J C:16J D:其它选项都不对
A:①
B:② C:④ D:③
A:2A B:0 C:1A D:3A
A:吸收120W功率 B: 无法计算 C:产生120W功率 D:吸收0功率
A:6V B:2V C:3V D:7V
A:10 B:8 C:4 D:12
A:③ B:① C:④ D:②
A:③ B:① C:④ D:②
A:I = -IS +GU B:I = IS +GU C:I = -IS -GU D:I = IS -GU
A:不变 B:长 C:短 D:不确定
A:电阻元件和电感元件串联 B:电感元件 C:电阻元件和电容元件串联 D:电容元件
A:③ B:② C:④ D:①
A:-2
B:2 C:-3 D:3
A:U1-U4+U3-U2=0 B:U1+U2+U3+U4=0 C:U4-U1+U3-U2=0 D:U1+U4+U3-U2=0
A:10W B:2.5W C:5W D:20W
A:④ B:② C:① D:③
A:与电压源同相 B:滞后于电压源90o C:与电感上电流同相 D:超前于电感上电流90o
A:顺时针旋转60° B:顺时针旋转90° C:逆时针旋转60° D:逆时针旋转90°
A:0V B:-50V C:-25V D:50V
A:12μF B:8μF C:16μF D:6μF
A:线电压与线电流之间的相位差角 B:相电压与相电流之间的相位差角 C:线电压与相电流之间的相位差角
A:④ B:① C:③ D:②
A:② B:① C:③ D:④
A:③ B:① C:② D:④
A:2 B:3 C:1 D:4
A:元件1为电感,元件2为电感 B:元件1为电容,元件2为电容 C:元件1为电阻,元件2为电感 D:元件1为电容,元件2为电感
A:④ B:①
C:② D:③
A: B:其它选项都不对
C: D:
A:3A B:21A C:15A D:-3A
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