题目内容

三相异步电动机星-三角降压起动实验中时间继电器进行了两次时间整定,分别为____。

A. 1s,5s
B. 2s,8s
C. 3s,6s
D. 5s,10s

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For the following statement about the adjustment method of the time relay, ( ) are correct. ① when adjusting, generally only adjust according to the value indicated on the dial; ② when adjusting, increase the delay time by clockwise direction; ③ when adjusting, increase the delay time by counterclockwise direction; ④ the sets must be verified after adjustment

A. ①②
B. ②③
C. ②④
D. ③④

For a 3-phase induction motor, the working voltage has declined by 10 percent of nominal voltage, it's torque should declined by ( ) percent of nominal torque.

A. 10%
B. 20%
C. 30%
D. 40%

Nominal secondary voltage of commonly used voltage transformer is ( ). when N1 /N2= 10000/100,measurable maximum voltage in parallel with secondary winding is ( ).

A. 100V / 1000V
B. 100V / 10000V
C. 500V / 5000V
D. 500 / 50000 V

在不可控相复励自动调压装置中,移相电抗器是( ),一般通过调节移相电抗器的( )可整定发电机的空载额定电压。

A. 三相铁芯线圈/线圈线径大小
B. 三相空心线圈/线圈匝数
C. 三相铁芯线圈/线圈匝数
D. 三相空心线圈/气隙