單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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