All of the following statements are true EXCEPT:
A. a knock sensor has a piezoelectric crystal sensing element that senses vibration and creates a voltage signal of 100 to 200 mV.
B. an oxygen (O2) sensor is a variable DC voltage generator.
C. pulse generators are signal generators.
D. in a variable AC voltage generator, a magnetic pickup generates an AC analog signal with a positive and negative sine wave.
Answer: A
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