Which one of the following transducer is made of semiconductor? 

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  1. Microphone
  2. Thermocouple
  3. Thermistor
  4. Thermometer

Answer (Detailed Solution Below)

Option 3 : Thermistor
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Detailed Solution

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Thermistor:

  • It is a semiconductor that changes resistance with a change in temperature.
  • The thermistor resistance is inversely proportional to the temperature.
  • When the temperature decreases, the resistance of the thermistor increases (NTC: Negative Temperature Coefficient).
  • It is mostly used in modern package air-conditioners and other electronic expansion valves.
  • Sometimes it is used as an anti-frost device also.
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