Discussion
A thermocouple indicates 720 degrees Celsius with a cold junction at 20 degrees. The temperature difference driving the output is
Answer: A
Correct answer: 700 degrees
A thermocouple's output depends on the difference between its hot and cold junctions:
\[ 720 - 20 = 700\ \text{degrees} \]
The instrument nonetheless displays 720, because cold junction compensation adds the reference temperature back in. Without that compensation the indication would change with cockpit temperature alone, which is why the compensation circuit is part of every thermocouple installation and why a fault in it produces an error that varies through the flight.
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