單項(xiàng)選擇題

DC generators are classified according to the manner in which（）

A.they are used
B.the field windings are connected to the load
C.the armature circuit is connected to the load
D.the field windings are connected to the armature circuit

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A circuit that has one wire in contact with the hull of the ship is a（）

A.series circuit
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單項(xiàng)選擇題

If two AC generators are to be operated in parallel, the load is distributed evenly by（）

A.means of rheostat the governor settings
B.a balance coil excitation
C.adjusting the governor settings
D.changing excitation