The GATE Grind

GATE 2021 BM – Question 19

Sensors and Bioinstrumentation · Sensors and Signal Conditioning · 1 mark · Multiple choice

Which displacement sensor is known for high sensitivity and a relatively large measurement range?

  1. Strain gauge
  2. Capacitive sensor
  3. LVDT
  4. Piezoelectric sensor

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Correct answer: (C) LVDT

Explanation

An LVDT converts core displacement into differential transformer voltage and combines high sensitivity with a useful linear travel range. It is the intended sensor C. Strain gauges measure local strain, capacitive displacement sensing often has small gaps, and piezoelectric sensors are mainly suited to dynamic changes.

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