Question

In a transformer, we place the tapping windings at the middle because __________

(a) of radial forces on the windings

(b) axial forces on the windings

(c) insulation level of the winding

(d) to provide a mechanical balance to the windings

I got this question during an interview for a job.

I'm obligated to ask this question of Autotransformers in portion Transformers of Electrical Machines

Answer 1

The correct choice is (b) axial forces on the windings

For explanation I would say: Due to two different voltages, different currents will flow in the windings and it will cause the axial forces due to currents interaction appear causing damage.