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【单选题】
If the synchronous generator connected in parallel to the infinite power grid keeps the active power output unchanged and changes from over excitation operation state to under excitation operation state, it is ().
A.
The Angle of
changes from positive to negative and the Angle of
from large to small;
changes from positive to negative and the Angle of
from large to small;B.
The Angle of
changes from positive to negative and the Angle of
from small to large;
changes from positive to negative and the Angle of
from small to large;C.
The Angle of
Angle changes from negative to positive, and
Angle decreases from large to small;
Angle changes from negative to positive, and
Angle decreases from large to small;D.
The Angle of
changes from negative to positive and the Angle of
from small to large.
changes from negative to positive and the Angle of
from small to large.举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
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B.
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C.
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A.
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B.
Increase the excitation current and decrease the input torque;
C.
Reduce the excitation current and increase the input torque;
D.
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A.
45
B.
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A.
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B.
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B.
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D.
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A.
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B.
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C.
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D.
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