AME 9 Q2

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State ONE limitation of the thermocouple, and how this limitation is overcome in practice.

C. Susceptibility to Electromagnetic Interference; Use of Shielded Cables: Thermocouples can be affected by electromagnetic interference, but this issue is addressed by using shielded cables to protect the signal.

D. Limited Temperature Range; Use of Special Alloys: Thermocouples may have a limited temperature range, but this is overcome by using special alloy types designed for high or low-temperature applications.

B. Slow Response Time; Use of Insulation: Thermocouples can have a slow response time to temperature changes, but this is mitigated by insulating the thermocouple to reduce heat transfer delays.

A. Limited Accuracy; Use of Calibration: Thermocouples have limited accuracy compared to other temperature sensors, but this is overcome by regularly calibrating the thermocouple to ensure accurate measurements.

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Describe the operation of a thermocouple.

B. A Single Metal Expands with Temperature: A thermocouple operates by measuring the expansion of a single metal as temperature changes, with the expansion directly indicating the temperature.

D. Temperature-Induced Magnetic Fields Generate Voltage: A thermocouple operates by creating a voltage from temperature-induced magnetic fields in the metal, with the voltage reflecting the temperature changes.

C. Electrical Resistance Changes with Temperature: A thermocouple operates by measuring changes in the electrical resistance of a single metal conductor, with resistance changes correlating to temperature variations.

A. Two Dissimilar Metals Produce a Voltage: A thermocouple operates by generating a voltage when two dissimilar metals are joined together and exposed to different temperatures, with the voltage being proportional to the temperature difference.

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