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Which instrument uses the change in electric resistance to measure the pressure?

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in Food Processing Unit Operations by (110k points)
Which instrument uses the change in electric resistance to measure the pressure?

(a) Bourdon tube pressure gauges

(b) Barometric sensor

(c) Piezoelectric pressure sensor

(d) Piezoresistive pressure sensor

The question was asked in a job interview.

This interesting question is from Pressure Measurement in a Fluid in chapter Fluid Flow Theory & Applications of Food Processing Unit Operations

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Best answer
The correct option is (d) Piezoresistive pressure sensor

Best explanation: Piezoresistive pressure sensoruses the change in electric resistance of a material when stretched to measure the pressure. Due to the simple design and robustness, this instrument is used for wide range of applications. These are used for gauge, absolute and relative pressure measurement in both high and low pressure applications.

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