Commutator pitches of duplex and simplex lap windings are respectively

Electrical Engineering XYZ MCQs

Commutator pitches of duplex and simplex lap windings are respectively:

1. 4 and 1
2. 2 and 2
3. 2 and 1
4. 4 and 2

Correct answer: 3. 2 and 1

Explanation:

1. Duplex Lap Winding: In a duplex lap winding, the commutator pitch is equal to the number of coils between the brushes. For a duplex lap winding, there are two parallel paths in the armature circuit, so the commutator pitch is usually equal to the number of coils per pole, which is typically two. Hence, for a duplex lap winding, the commutator pitch is 2.
2. Simplex Lap Winding: In a simplex lap winding, there is only one path for the armature current. Therefore, the commutator pitch is equal to the number of coils between consecutive commutator segments. In most cases, the commutator pitch for a simplex lap winding is equal to the number of poles. Hence, for a simplex lap winding, the commutator pitch is typically 1.