FAA Powerplant Written Practice Test

What is the spatial orientation of the two North poles in a high tension magneto?

1. 90 degrees apart

2. 180 degrees apart

3. 270 degrees apart

4. 360 degrees apart

The correct answer is: 180 degrees apart

In a high tension magneto, the two North poles are oriented 180 degrees apart. This configuration is essential for the proper functioning of the magneto system. The arrangement ensures that the magnetic field generated by the magneto can effectively induce a current in the ignition system as the rotor spins through the magnetic field. When the North poles are 180 degrees apart, it allows for maximum coupling of the magnetic lines of force, which is vital for producing the high voltage needed to create a spark at the spark plugs. This angular separation results in a balanced magnetic field that effectively rotates as the rotor turns, resulting in timely ignition events in the engine cycle. This specific orientation maximizes the efficiency and performance of the magneto compared to other angles that would disrupt the magnetic field generation and could lead to inconsistent ignition timing or performance issues.