單項(xiàng)選擇題

Which of the following statements represents the main difference between a relay and a contactor?（）

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

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單項(xiàng)選擇題

Any electric motor can be constructed to be（）.

A.short proof
B.ground proof
C.explosion proof
D.overload proof

單項(xiàng)選擇題

Current changing in direction and rising and falling in value is （）.

A.AC
B.DC
C.generator
D.fresh water generator

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Which of the following statements represents the main difference between a relay and a contactor?（）

你可能感興趣的試題

Any electric motor can be constructed to be（）.

Current changing in direction and rising and falling in value is （）.

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