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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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

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

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The total resistance of a parallel circuit is always （）.

你可能感興趣的試題

Reduced voltage applied to a motor during the starting period will （）.

Line losses in a distribution circuit are kept to a minimum by （）.