Armature coil is short circuited by brushes when it lies
A)along neutral axis
B)along field axis
C)in All of the above positions
D)in none of the above positions

Question

Quizplus · Accepted Answer

When the armature coil lies along the neutral axis, it is momentarily short-circuited by the brushes in a DC machine. This is because the coil sides are moving parallel to the magnetic field lines, resulting in zero net EMF.

Armature Coil Is Short Circuited by Brushes When It Lies