Q. Commutator performs rectification so that output of the machine is unidirectional.

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Q. What is the difference of DC voltages in the adjoining Brushes?

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Q. What is the effect of armature coils at points where brushes are located?

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Q. As the armature rotates, the number of coils in series tapped by the brush pairs_________

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Q. Coil span for 4-pole, 12-slot armature winding is_______

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Q. What is the nature of the coils when Yᴄs value is non-integral?

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Q. For a 2-pole DC machine with coil span equal to 6, what are the number of commutator segments?

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Q. When coil sides are pole pitch apart, the DC armature winding is called as ___________

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Q. Resultant pitch in the lap winding is__________

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Q. What is the condition of retrogressive winding?

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Q. What is the value of Yb for a lap winding with a 4-pole, 12-slot armature with two coil sides/slot. Assume single-turns coils.

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Q. What is the value of Yf for a lap winding with a 4-pole, 12-slot armature with two coil sides/slot? (Assume single-turns coils – progressive winding)

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Q. Equalizer rings are needed in lap winding.

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Q. What is the symmetry requirement of lap winding?

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Q. What is the relation between number of parallel paths(A) and number of poles(P)?

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Q. Current flowing through the armature conductors Ic is related to total current Ia by_______

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Q. Value of commutator pitch in lap winding is_____

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Q. What is the value of Yf for a lap winding with a 4-pole, 12 commutator segments, with two coil sides/slot.?

(Assume single-turns coils -retrogressive winding).

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Q. What will be the value of “Yf + Yb” for a wave winding?

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Q. For a progressive wave winding Yc = ______

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