20. Which of the following are used in machine tools for force measurement, hydraulic or pneumatic presses, and as impact sensors in aeronautical vehicles?

Potentiometer
Capacitive element sensor
Strain gauges
Optical encoders

Answer: C) Strain gauges

Explanation:

Strain gauges are used in machine tools for force measurement, hydraulic or pneumatic presses, and as impact sensors in aeronautical vehicles

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Which of the following are used in machine tools for force measurement, hydraulic or pneumatic presses, and as impact sensors in aeronautical vehicles?