DC machine Quiz Practice Quiz | DC machine

To convert AC voltage generated in the armature to DC voltage. — The commutator reverses the current direction in the armature coils.

Speed of the motor — Back EMF opposes the applied voltage and is proportional to speed.

Thin wire with many turns. — Field windings require high resistance for constant current and many turns for strong magnetic fields.

Series motor — Series motors have the armature and field in series to get high starting torque.

All of the above. — Pole shoes shape and direct magnetic flux, reduce reluctance and support the field.

Question 1 of 5

What is the function of the commutator in a DC machine?

The commutator reverses the current direction in the armature coils.

Question 2 of 5

Back EMF opposes the applied voltage and is proportional to speed.

Question 3 of 5

Field windings require high resistance for constant current and many turns for strong magnetic fields.

Question 4 of 5

Series motors have the armature and field in series to get high starting torque.

Question 5 of 5

Pole shoes shape and direct magnetic flux, reduce reluctance and support the field.