單項(xiàng)選擇題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


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1.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

2.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

3.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

4.單項(xiàng)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

5.單項(xiàng)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