單項(xiàng)選擇題

A “dead front” switchboard is one （）.

A.without switches on it
B.with insulated switches and no exposed terminals
C.without circuit breakers
D.without safety hand nails nor rubber mats

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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

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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