Electrical Temperature Sensing

Try these questions

5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. A factory in Nakuru needs to measure the temperature inside a kiln at about 1,400 °C. Which sensor is most suitable?

   • A. Thermocouple
   • B. NTC thermistor
   • C. Mercury-in-glass thermometer
   • D. Clinical thermometer

2. 2. Which statement about the resistance of temperature sensors is correct?

   • A. The resistance of a platinum RTD increases as temperature rises
   • B. The resistance of an NTC thermistor increases as temperature rises
   • C. The resistance of a platinum RTD decreases as temperature rises
   • D. The resistance of an NTC thermistor stays constant as temperature rises

3. 3. A thermocouple has a Seebeck coefficient of 40 μV/°C. Its cold junction is at 0 °C and its hot junction is in an exhaust pipe at 350 °C. Calculate the e.m.f. generated in millivolts.

   Type your answer (in mV) in the lesson.

4. 4. An NTC thermistor has a resistance of 1,200 Ω at 20 °C. When it is warmed to 50 °C, its resistance falls by 750 Ω. Calculate its new resistance.

   Type your answer (in Ω) in the lesson.

5. 5. What name is given to the effect in which an e.m.f. is produced when two different metals are joined at two junctions kept at different temperatures?

   Type your answer in the lesson.

More in Temperature and Thermal Expansion

• ▸Industrial Applications of Material Properties
• ▸Practical Material Testing
• ▸Concept of Temperature and Temperature Scales
• ▸Liquid Expansion and Mechanical Thermometers
• ▸Thermal Expansion in Solids
• ▸Engineering Applications and Consequences of Solid Expansion
• ▸Thermal Expansion of Liquids
• ▸Anomalous Expansion of Water

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