单项选择题
The purpose of the commutator and brushes on a DC generator is to（）
A.change AC to DCcurrent
B.change DC to AC current
C.neutralize a armature reaction
D.carry current to the outside circuit
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相关考题
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单项选择题
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 -
单项选择题
A circuit that has one wire in contact with the hull of the ship is a（）
A.series circuit
B.grounded circuit
C.short circuit
D.closed circuit -
单项选择题
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
