Chapter 4, Section 2 Flashcards
What are the two parts of a mechanical switch?
The actuator and contacts.
What is a basic toggle switch in aircraft installations?
Mechanical switch with a lever handle that can be flipped up or down to open or close the circuit.
What is a multi-throw switch?
A switch that can connect a single input to multiple outputs.
A momentary on switch is used for what in an aircraft radio installation?
Transmitting or keying the microphone.
What is the use of an electrical relay in an aircraft?
Control high-power circuits with low-power signals.
What is the only moving part of a relay?
The armature.
What pulls the armature onto the core?
A magnetic field generated by the coil.
What are the devices in the relay that make the electrical connections?
Contacts.
What are the three basic mechanical part of a relay that could malfunction?
Coil, Armature, and Contacts.
Under what electrical principle do proximity sensors work?
Electromagnetic induction.
In a fuel quantity indicating system for large aircraft, what small electrical component are the fuel probes constructed like?
Variable resistors.
What is an example of a position sensor in an aircraft?
A potentiometer, used in ailerons, flaps, and elevators.
What is the circuit called that can give accurate variable resistance readings no matter the system voltage?
Bridge circuit or Wheatstone bridge.
What can be a problem with using a simple variable resistor in a fuel or other calibrating indicating system?
It can be affected by changes in system voltage, leading to inaccurate readings.
