A.open circuit
B.short circuit
C.polarized ground
D.ground reference point
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A.Contactors control current and relays control voltage
B.A relay is series connected and a contactor is parallel connected
C.Contactors can handle heavier loads than relays
D.Contactors are made from silver and relays are made from copper
A.short proof
B.ground proof
C.explosion proof
D.overload proof
A.AC
B.DC
C.generator
D.fresh water generator
A.AC voltage to the armature
B.AC voltage to the field
C.DC voltage to the armature
D.DC voltage to the field
A.wash it with fresh water and apply an external source of heat
B.renew the windings
C.send it ashore to an approved service facility
D.rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air
最新試題
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