Q. In a DC machine, how coil-side emf varies towards the outer side of poles?

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Resultant pitch in the lap winding is__________

View solution

Q. What is the condition of retrogressive winding?

View solution

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.

View solution

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)

View solution

Q. Equalizer rings are needed in lap winding.

View solution

Q. What is the symmetry requirement of lap winding?

View solution

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

View solution

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

View solution

Q. Value of commutator pitch in lap winding is_____

View solution

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).

View solution

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

View solution