Q. Find the one which is not true about ultrasonic sensor.

A
LCD display
B
The load of the engine can be determined by calculating diverse absolute pressure, that can be done by using these transducers as the MAP sensor in fuel injection systems.
C
Linearity
D
If any obstacle or any object is found that is detected by ultrasonic transducer then it transmits the waves and gets reflected back from the object and these waves are received by the transducer.
Solution:

b is one of the application of piezoelectric transducer

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