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【简答题】
He__ at the last party. He felt sorry for it. A. makes some mistakes B make a mistake C. made few mistakes D. made many mistakes
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举一反三
【简答题】有一台三相异步电动机,额定电压为380伏,三角形联接,若测出线电流为30安,那末通过每相绕组的电流等于()安。
【单选题】What is the possible relationship between the speakers?
A.
Family members
B.
Classmates.
C.
Co-workers.
【单选题】On the one hand, he was highly praised by his teachers, but blamed by some of his classmates______.
A.
on another hand
B.
at other hand
C.
at second hand
D.
on the other hand
【简答题】The new student is quite reserved. Never __________ him talking with his classmates． [A] did I find [B] I found [C] have I found [D] I have found
【简答题】有一台三相异步电动机,额定电压为220V,每相绕组的阻抗为100Ω,接在线电压为380V的三相电源上工作。 试求:电动机三相绕组应怎样连接?
【单选题】有一台三相异步交流电动机,每相绕组的额定电压为220V,对称三相电源的线电压为380V,则电动机的三相绕组应采用的联结方式是( )。
A.
星形联结,有中线
B.
星形联结,无中线
C.
三角形联结
D.
A、B均可
【简答题】一台笼型三相异步电动机，定子绕组Y形联结，其技术数据为：额定功率P N =40kW，额定线电压U 1N =380V，额定电流I N =87.2A，起动电流倍数K T =6.3，起动转矩倍数K st =1.2。要求该电动机起动时最大电流不超过350A，现有一台三相对称电抗器，每相电抗为X=0.3Ω。如果用该电动机拖动通风机工作，试问能否采用定子串接该电抗器减压起动?
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