In the case of lap winding resultant pitch is

The correct answer is: C. Sum of front and back pitches.

The resultant pitch is the total length of one turn of the winding, measured along the surface of the armature. It is equal to the sum of the front pitch and the back pitch.

The front pitch is the distance between the centers of two adjacent coils on the same side of the armature. The back pitch is the distance between the centers of two adjacent coils on opposite sides of the armature.

The resultant pitch is important because it determines the speed at which the armature rotates. The faster the armature rotates, the greater the resultant pitch.

The following is a brief explanation of each option:

• Option A: Multiplication of front and back pitches. This is incorrect because the resultant pitch is not equal to the product of the front and back pitches.
• Option B: Division of front pitch by back pitch. This is incorrect because the resultant pitch is not equal to the quotient of the front pitch and the back pitch.
• Option C: Sum of front and back pitches. This is correct because the resultant pitch is equal to the sum of the front pitch and the back pitch.
• Option D: Difference of front and back pitches. This is incorrect because the resultant pitch is not equal to the difference of the front pitch and the back pitch.