Discussion
Consider the following sensor and principle pairs:
Thermocouple - Voltage from a temperature difference between junctions
Resistance thermometer - Change of electrical resistance with temperature
Continuous fire loop - Change of resistance or capacitance when heated
Torquemeter - Optical measurement of blade angle
How many of the pairs given above are correctly matched?
Answer: B
Correct answer: Only three
The first three describe their sensors correctly. A thermocouple generates a voltage from the temperature difference between its junctions; a resistance thermometer works by the change of electrical resistance with temperature; and a continuous fire loop signals by a change in resistance or capacitance when heated.
The fourth is wrong. A torquemeter measures shaft torque, hydraulically from the axial thrust of a helical gear or electrically from shaft strain. Blade angle is measured separately by a propeller pitch indication, and neither measurement is optical.
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