The GATE Grind

GATE 2021 IN – Question 17

Sensors and Industrial Instrumentation · Temperature and analytical sensors · 1 mark · Multiple choice

Which temperature sensor has an exponential input–output characteristic?

  1. Thermistor
  2. Thermocouple
  3. Resistive Temperature Device (RTD)
  4. Mercury thermometer

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Show answer and explanation

Correct answer: (A) Thermistor

Explanation

A thermistor approximately follows R(T)=R0 exp[B(1/T−1/T0)] with absolute temperatures. This strongly nonlinear exponential dependence distinguishes it from the approximately linear RTD and thermocouple relations over their usual limited ranges.

Thus **thermistor, A**.