单项选择题
A.change AC to DCcurrent B.change DC to AC current C.neutralize a armature reaction D.carry current to the outside circuit
DC generators are classified according to the manner in...
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
A circuit that has one wire in contact with the hull of...
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
If two AC generators are to be operated in parallel, th...
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
