轉(zhuǎn)子每相繞組開路電壓E20。
A、正確
B、錯誤
正確答案：B
轉(zhuǎn)子繞組開路時，轉(zhuǎn)子電路電流I2=0，轉(zhuǎn)子轉(zhuǎn)速n=0，轉(zhuǎn)子繞組電動勢頻率f2=f1=50Hz，故轉(zhuǎn)子每相繞組的感應(yīng)電動勢（即開路電壓）E20=4.44f2N2φ=4.44f1N2φ=4.44×50×20×0.023V=102V
B、錯誤
正確答案：B
轉(zhuǎn)子繞組開路時，轉(zhuǎn)子電路電流I2=0，轉(zhuǎn)子轉(zhuǎn)速n=0，轉(zhuǎn)子繞組電動勢頻率f2=f1=50Hz，故轉(zhuǎn)子每相繞組的感應(yīng)電動勢（即開路電壓）E20=4.44f2N2φ=4.44f1N2φ=4.44×50×20×0.023V=102V