Discussion
A dc shunt motor started with full field and rated voltage develops a starting torque limited by
Answer: B
Correct answer: the current the machine and supply will permit
At standstill there is no back emf, so the current would be limited only by the armature resistance and would be many times the rated value. What actually caps the starting torque is therefore the current the commutator, the windings and the supply can tolerate, imposed through the starter or the converter - not the flux, which is at its full value, and not the load.
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