In order to change the direction of rotation of a D-Cmotor （）
(1) the field leads must be changed
(2) the input leads must be changed
A.（1）only
B.（2）only
C.either（1）or（2）
D.neither（1）or（2）
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If a small electric motor is immersed in salt water it should be （）
(1) washed in fresh water
(2) dried in an oven
A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) or (2)
A.ampere
B.kilovolt
C.watt
D.farad
A.wasted energy
B.efficient operation
C.a short in the exciter field windings
D.an excessive number of minor system grounds
A.increase
B.not change
C.decrease
D.be exactly 60 hertz
A.alternating current
B.omnidirectional current
C.direct current
D.sinusoidal current
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