Worksheet 46-Sensors Flashcards
Under what electrical principle do proximity sensors work?
Proximity sensors operate using mutual inductance.
For a proximity sensor, what does putting a steel target next to it do?
Placing a steel target next to a proximity sensor changes the inductive impedance of the device that is sensed by circuits.
In a fuel quantity indicating system for large aircraft, what small electrical component are the fuel probes constructed like?
Fuel probes of large aircraft are constructed like large capacitors with the fuel acting as the dielectric.
How are fuel probes wire in the tank that allow them to average the fuel level inside throughout the flight?
The probes are wired in parallel so they can give an accurate fuel level in a tank at any attitude.
What physical property of a bimetallic junction is used in devices such as temperature probes?
A bimetallic junction is made up of two dissimilar metals that are bonded together to form a bond that will bend under different temperatures.
What is produced when you bond alumel and chromel together and apply heat?
Alumel and chromel bimetallic junction will produce a voltage when heated.
What is an example of a position sensor in an aircraft?
A position sensor is one that uses an electrical signal to represent an indication of actuated components such as flaps, landing gear, leading edge devices in the cockpit.
What can be a problem using a simple variable resistor for a fuel indicating system or other calibrated indicating system?
The problem with using a single resistor as a position indicator is that the calibration is adversely affected by variances in system voltage.
What is the circuit called that can give accurate variable resistance readings no matter the system voltage?
To produce accurate variable resistance readings of an indicator, a resistor bridge circuit is used.
