單項(xiàng)選擇題

A circuit breaker and a fuse have a basic similarity in that they both （）.

A.can be reset to energize the circuit
B.should open the circuit when overloaded
C.will burn out when an over current flow develops
D.All of the above

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單項(xiàng)選擇題

An electrical device which prevents an action from occurring until all other required conditions are met is called a/an （）.

A.limit
B.monitor
C.modulator
D.interlock

單項(xiàng)選擇題

The frequency output of an operating alternator is controlled by the （）.

A.relative speed of the rotor poles
B.number of turns of wire in the armature coil
C.strength of the magnets used
D.output voltage