Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 None of above.
 Residual magnetism of the generator.
 Armature resistance.
 Field resistance.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

 the inequality of air-gap flux on the top and bottom halves of the armature is removed
 the interpoles produce additional flux to augment the developed torque
 a counter-emf is induced in the coil undergoing commutation
 the flux waveform is improved with reduction in harmonics

ANSWER DOWNLOAD EXAMIANS APP