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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.
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【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
【单选题】Beat 3 of the Bumper Harvest Steps: Withdraw the left foot, land it 30cm right ahead the right foot, beat the front drum head with the right hand, open both arms.
A.
45
B.
40
C.
35
D.
30
【单选题】During normal operation, the generator outputs both active and reactive power, which is called power late phase (also known as lag). At this time, the generator sends () reactive power.
A.
Inductive
B.
Capacitive
C.
Inductive and capacitive
D.
None of them
【单选题】Most of the sand here is ______.
A.
quartz sand
B.
beach sand
C.
artificial sand
D.
dry sand
【单选题】How old is the Colorful Sand Forest?
A.
270 million years old
B.
340 million years old
C.
210 million yesrs old
D.
300 million years old
相关题目：
【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
【单选题】Beat 3 of the Bumper Harvest Steps: Withdraw the left foot, land it 30cm right ahead the right foot, beat the front drum head with the right hand, open both arms.
A.
45
B.
40
C.
35
D.
30
【单选题】During normal operation, the generator outputs both active and reactive power, which is called power late phase (also known as lag). At this time, the generator sends () reactive power.
A.
Inductive
B.
Capacitive
C.
Inductive and capacitive
D.
None of them
【单选题】Most of the sand here is ______.
A.
quartz sand
B.
beach sand
C.
artificial sand
D.
dry sand
【单选题】How old is the Colorful Sand Forest?
A.
270 million years old
B.
340 million years old
C.
210 million yesrs old
D.
300 million years old
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