单项选择题
Which of the following marine examples belongs to the open loop control system?（）
A.Accommodation heating system
B.Steering gear
C.Boiler control
D.Cargo control
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相关考题
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单项选择题
The operation of （） two alternators requires the voltages to be equal and also in phase.
A.paralleling
B.series-mounting
C.running
D.control -
单项选择题
With a purely （） load the voltage and current are in phase, giving a power factor of one.
A.inductive
B.resistance
C.combined
D.capacitate -
单项选择题
The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.
A.two
B.three
C.four
D.five
