单项选择题
The total resistance of a parallel circuit is always ().
A.larger than the greatest branch resistance
B.smaller than the lowest branch resistance
C.equal to the sum of the individual branch resistances
D.one-half the sum of the individual branch resistances
相关考题
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单项选择题
Reduced voltage applied to a motor during the starting period will ().
A.result in decreased acceleration time only
B.lower the starting current and increase accelerating time
C.cause a greater starting torque
D.increase the starting current and pump capacity -
单项选择题
Line losses in a distribution circuit are kept to a minimum by ().
A.adding rubber insulation conductors to the circuit
B.using higher current and lower voltage increasing the
C.number of thermal relays in the circuit
D.using higher voltage and lower current -
单项选择题
Which of the following components are used to convert alternating current produced in the generator windings to direct current?()
A.Armature and equalizer
B.Commutator and brushes
C.Rotor and interpoles
D.Field and exciter
