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【单选题】
For a synchronous generator running in infinite power grid, when the current falls behind the one-phase Angle of voltage, the prime motor torque remains unchanged and the excitation current is gradually reduced, then the armature current ().
A.
Too large
B.
It goes up and then it goes down
C.
Is smaller
D.
First decrease and then increase
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】How to balance tourism development and environment protection of Potatso National Park?
A.
To use battery-powered shuttles for tours
B.
Sightseeing regions should be limited.
C.
To advocate the ecological tours
D.
To protect the eco-system there
【单选题】For the transportation problem, the potential method and the closed loop method are used to calculate the test number, then the result ( )
A.
must be the same
B.
must be different
C.
may not be exactly the same
D.
no connection
【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 sta...
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.【单选题】What makes the sand here colorful?
A.
trace elements and minerals
B.
the change of seasons and weather
C.
intensity of the sun
D.
All above
【单选题】Synchronous generators parallel to the infinite grid must ( ) to increase ( ) to ( ) while keeping the load current as the rated value.
A.
Increase the excitation current and the input torque;
B.
Increase the excitation current and decrease the input torque;
C.
Reduce the excitation current and increase the input torque;
D.
Reduce the excitation current and increase the input torque.
【单选题】When searching for a closed circuit of a space, if you encounter a kigg, you can choose, but the following statement is incorrect ( )
A.
turn 90 degrees left
B.
turn right 90 degrees
C.
cross
D.
back
【单选题】When solving the transportation problem, the number of "vertices" on the closed loop of each space must be ( )
A.
Four
B.
Even
C.
Odd
D.
Uncertain