单项选择题
On commonly used ships,if two A√Cgenerators are operated in parallel, the load is distributed evenly by （）.
A.varying the D-Cexciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of prime mover
D.shorting out part of the armature windings
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相关考题
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单项选择题
Moisture in a D-Cmotor would cause （）.
A.short circuit
B.speed up
C.slow down
D.hunting -
单项选择题
Prior to any overhaul work on electric equipment, it is important to ensure the circuits are （）.
A.live
B.dead
C.excited
D.on line -
单项选择题
（） control system is one in which the control action is independent of the output.
A.Feed back
B.Negative feed back
C.Close loop
D.Open loop
