单项选择题
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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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 -
单项选择题
The device that most commonly utilizes the principle of electromagnetic induction is the（）.
A.diode
B.transformer
C.transistor
D.rheostat -
单项选择题
Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）
A.Transducer
B.Reducer
C.Transformer
D.Rectifier
