Show More Ask Question

1 Answer

Answer :

At the instant of starting when a D.C. motor is put on supply, it behaves like a low resistance circuit.

Like 0 like
Next Page →

Related

Description : As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit?

Answer : As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit a resistance is connected in series with armature.

Answer : If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

Answer : If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.

Answer : The starting resistance of a D.C. motor is generally low.

Answer : For starting a D.C. motor a starter is required because it limits the starting current to a safe value.