Final answer:
The number of thermocouples measuring ITT between the high-pressure and low-pressure turbines varies depending on the engine model; consult the specific engine's maintenance manual or educational resource for the correct answer.
Step-by-step explanation:
The question asks how many thermocouples, which are located between the high-pressure turbine (N2) and the low-pressure turbine (N1), measure ITT (Interstage Turbine Temperature). Without specific information about the type of engine or aircraft, it is impossible to provide an accurate number as it varies between different engine models and manufacturers. In general, modern aircraft engines may have multiple thermocouples arranged in a circumferential pattern around the engine to accurately measure the turbine temperature. However, the possible answers provided suggest this may be a question from a specific textbook or course material which would have the exact number. Therefore, please refer to the specific engine's maintenance manual or educational resource that pertains to the equipment in question for the correct answer.