Discussion
A vibration measurement gives a signal that falls away below about 2 Hz although the vibration continues. The transducer is most likely
Answer: C
Correct answer: piezoelectric, its charge leaking away at low frequencies
A piezoelectric transducer produces charge rather than a steady voltage, and that charge drains away through the finite input resistance of the cable and amplifier. The arrangement therefore behaves as a high-pass filter, and the low frequency limit is set by the time constant of the crystal capacitance and that resistance - which is why a charge amplifier is used, and why a piezoelectric accelerometer cannot measure a constant acceleration at all.
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