For the development of electromagnetic torque in a rotating electrical machine, the number of rotor poles must be ____________
A. greater than the stator poles
B. less than the stator poles
C. equal to the stator poles
D. either greater or lesser than the stator poles
Answer:A
For the development of electromagnetic torque in a rotating electrical machine, the number of rotor poles must be ____________
A. greater than the stator poles B. less than the stator poles C. equal to the stator poles D. either greater or lesser than the stator poles
Explanation: If the rotor poles are not equal to the stator poles, the net electromagnetic torque will be zero as the force of attraction will be cancelled by the force of repulsion.