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

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单项选择题

In a series circuit, which value will remain unchanged at all places in the circuit?（）

A.Voltage
B.Current
C.Resistance
D.Inductance

单项选择题

Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.

A.increase in resistance with increased temperature
B.increase in resistance with decreased temperature
C.decrease in resistance with increased temperature
D.increase in conductance with increased temperature

单项选择题

The function of a rectifier is similar to that of a （）.

A.trap
B.regulating valve
C.check valve
D.filter