The speed of a DC motor can be controlled above the rated speed by varying which of the following?
(A) Applied voltage
(B) Resistance of armature circuit
(C) Flux per pole
1
Only (C)
2
Only (B)
3
(A) and (B)
4
(A), (B), and (C)
The speed of a DC motor can be controlled above the rated speed by varying which of the following?
(A) Applied voltage
(B) Resistance of armature circuit
(C) Flux per pole