Rotor speed in cumulatively cascade method for speed control

Q.  In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor and PB is the number of poles of auxiliary method. Then the speed of the rotor B is given by
- Published on 29 Oct 15

a. 120f / PA + PB
b. 120f / PA - PB
c. 120f / PA
d. 120f / PB

ANSWER: 120f / PA + PB

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