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What will happen to a torque, if a DC series motor is accidentally connected to single phase ac supply voltage?

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What will happen to a torque, if a DC series motor is accidentally connected to single phase ac supply voltage?

(a) Pulsating and unidirectional

(b) Steady and unidirectional

(c) Oscillating

(d) Cannot be determined

I had been asked this question in final exam.

This question is from Operating Characteristics of DC Series Motor topic in chapter Characteristics of DC Motors of DC Machines

1 Answer

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Best answer
The correct choice is (a) Pulsating and unidirectional

The best explanation: In DC series motor, the AC currents through the field and armature winding will be made unidirectional by the function of commutator and brushes. So, torque will be unidirectional but it will be pulsating also due to AC.

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