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單項(xiàng)選擇題

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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單項(xiàng)選擇題

The operation of （） two alternators requires the voltages to be equal and also in phase.

A.paralleling
B.series-mounting
C.running
D.control

單項(xiàng)選擇題

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

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