Discussion
Match each sensing element in List I with its operating principle in List II.
List I
A. Thermocouple
B. Resistance thermometer
C. Continuous fire detection loop
D. Tachometer generator
List II
1. Voltage generated by a temperature difference
2. Resistance varying with temperature
3. Resistance or capacitance changing anywhere along its length when heated
4. Output frequency proportional to shaft speed
Select the correct match.
Answer: A
Two of the four measure temperature by quite different means, and only the thermocouple generates its own voltage. That self-generating property is why it needs no excitation supply and survives a loss of electrical power.
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