【单选题】【消耗次数：1】
已知变压器的原边的匝数N1=1000匝，副边的匝数N2=2000匝，若此时变压器的
负载阻抗为5Ω，则从原绕组看进去此阻抗应为
①
2.5Ω
②
1.25Ω
③
20Ω
参考答案：
复制
纠错
相关题目
【单选题】
一台单相变压器，原边阻抗和折算后的付边阻抗相等，若此变压器在额定电压下短路? （指稳态短路），此时铁芯中的磁通_____。
①
减少到近似原来磁通的1/2；?
②
略微减少一点；?
③
略微增加一点。
随机题目
【单选题】
_____ you work hard enough _____ you be able to get a PhD degree in three years.
①
Only if, will
②
If only, would
③
Should, will
④
Unless, would
【单选题】
China hosted the Olympic Games in 2008, thus _____ her dream to be recognized as one of the greatest nations in the world.
①
having realized
②
realizing
③
realized
④
to realize
【单选题】
Man is superior to animals ______ he uses language to convey his thoughts.
①
that
②
in that
③
when
④
in which
【单选题】
If it _____ for his help, I wouldn’t be a university student now.
①
hasn’t been
②
hadn’t been
③
wasn’t
④
weren’t
【单选题】
The conference _____ next year will be an important event in the history of the country.
①
having been held
②
being held
③
to be held
④
held
【单选题】
Have a word with the manager ______ if he’s willing to reduce the price.
①
and to see
②
and see
③
and seeing
④
so to see
【单选题】
It is from the earliest times ______ men have studied the world around them with interest.
①
which
②
where
③
how
④
that
【单选题】
幻灯片放映时，使光标变成“激光笔”效果，_______。
①
按Ctrl+F5
②
按Shift+F5
③
按住Ctrl键的同时，按住鼠标的左键
④
执行“幻灯片放映”→“自定义放映”命令