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Which output does a magnetic reluctor pickup produce?

  • A.An alternating signal whose amplitude rises with speed
  • B.A square wave of constant amplitude, which is produced by the switching of a transistor within the sensor housing
  • C.A direct voltage
  • D.A pulse width modulated signal, whose duty cycle indicates the position of the trigger wheel within the distributor

Answer: A

A coil and magnet produce a voltage as the reluctor teeth pass, and the amplitude grows with speed. A Hall sensor gives a square wave of constant amplitude, which makes the second option a correct description of the other sensor type. Naming what changes and what stays the same is the reliable route through questions of this shape. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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