题目内容
We divide the steering gear into P type, PI type, PD type and PID type according to the control law. Generally speaking the best control law is ( ).
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When there is course deviation, if the steering gear is at servo mode, we should give a reverse angle ( ) the ship tracks back to the course; and the reverse angle is given ( ).
For a synchronous generator, if the power factor increases from 0.6 (lagging) to 0.8 (lagging), the exciting current should ( ) if we want to keep the terminal voltage constant.
If the output active power and the terminal voltage of a single running synchronous generator keeps constant, for ① cosφ=1，cosφ=0.8(lagging)，③cosφ=0.8(leading), ( ) has the biggest reading of the exciting current meter and line current meter on the generator control panel.
In order to keep the voltage of the synchronous generator constant under any load, the excitation current must be adjusted according to ( ) of the synchronous generator.
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