Question

A DC series motor is accidentally connected to a single-phase AC supply. The torque produced will be:

• A. Zero
• B. Oscillating
• C. Steady and unidirectional
• D. Pulsating and unidirectional

Hint:

A DC series motor connected to an AC supply will produce pulsating torque, but it will remain unidirectional due to the motor's construction.

Answer 1

The Correct Option is D

When a DC series motor is connected to a single-phase AC supply, the motor will still produce torque due to the interaction between the current and the magnetic field. However, the torque will be pulsating because of the alternating nature of the AC supply. Despite the pulsations, the torque remains unidirectional due to the nature of the series field winding in the motor. Thus, the correct answer is that the torque will be pulsating and unidirectional.