DC Motors Quiz

What happens to a current-carrying conductor when placed in a magnetic field?

• It loses its current.

• It becomes a permanent magnet.

• It experiences a force that moves it out of the field.

• It remains stationary.

Which component of a DC motor makes contact with the commutator?

• Armature

• Rotor

• Brushes

• Field winding

How is the speed of a DC shunt motor controlled?

• By varying the armature voltage and shunt field current.

• By changing the number of poles.

• By altering the commutator segments.

• By adjusting the rotor size.

What is the primary characteristic of a DC series motor?

• Low starting torque

• High starting torque

• Constant speed

• Variable speed

What indicates a problem with the commutator in a DC motor?

• A polished brown color

• Grooves or ruts

• Smooth surface

• Uniform wear