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單項(xiàng)選擇題

Which of the motors for the devices listed below is fitted with an instantaneous overload relay?（）

A.Fan
B.Pump
C.Winch
D.Machine tool

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單項(xiàng)選擇題

One factor that determines the frequency of an alternator is the（）.

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

單項(xiàng)選擇題

The device that most commonly utilizes the principle of electromagnetic induction is the（）.

A.diode
B.transformer
C.transistor
D.rheostat

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