A.shunt
B.high-resistance coil in the armature circuit
C.low-resistance coil in the armature circuit
D.shunt and a coil of high resistance
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A.minimum
B.maximum
C.leading
D.lagging
A.undercutting
B.sanding
C.burnishing
D.filing
A.reduce current pulsations
B.reduce brush chatter
C.prevent uneven commutator wear
D.allow greater power generation
A.varying the DC exciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of the prime mover
D.shorting out part of the armature windings
A.a rheostat
B.a balancing coil
C.changing field excitation
D.adjusting the governor settings
最新試題
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