單項選擇題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


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1.單項選擇題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

2.單項選擇題In a series circuit, which value will remain unchanged at all places in the circuit?()

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

3.單項選擇題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

4.單項選擇題The function of a rectifier is similar to that of a ().

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

5.單項選擇題Electrical circuits are protected against overheating by means of a/an ().

A.circuit breaker
B.amplifier
C.diode
D.capacitor