Question

What is the disadvantage of the piezoelectric pressure pickup?

(a) it can only give pressure difference

(b) it can measure only low pressure

(c) it is not suitable for dynamic measurement

(d) has too much sensitivity

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This interesting question is from Engine Management Systems in section Engine Electronics of IC Engine

Answer 1

The correct answer is:

(c) it is not suitable for dynamic measurement

The piezoelectric pressure pickup is primarily used for dynamic pressure measurements in applications like vibration, shock, and rapid changes in pressure. However, it has a disadvantage in that it is not suitable for static or low-frequency dynamic measurements. This is because piezoelectric sensors generate charge in response to changes in pressure (dynamic pressures), and they do not maintain a constant output for steady or static pressures. Therefore, they are not suitable for measuring static or very slow-varying pressures over time.