DC Machine and Electromagnet Quiz

The outer frame of a DC machine is called the:

• Yoke

• Armature

• Field winding

• Commutator

Which part of a DC machine rotates?

• Yoke

• Armature

• Pole core

• Field winding

The function of brushes in a DC machine is to:

• Support the shaft

• Produce magnetic field

• Collect current from commutator

• Cool the armature

The commutator in a DC machine is made of:

• Copper

• Carbon

• Mica-segmented copper

• Aluminium

Which material is commonly used for brushes in DC machines?

• Aluminium

• Carbon

• Brass

• Iron

The armature core is laminated to reduce:

• Mechanical loss

• Copper loss

• Eddy current loss

• Friction

Field windings are generally placed on:

• Armature

• Yoke

• Shaft

• Pole core

Which part of the DC machine houses the field coils?

• Armature

• Yoke

• Pole core

• Commutator

The purpose of the yoke in a DC machine is to:

• Provide support and magnetic path

• Rotate the shaft

• Commutate the current

• Generate voltage

The number of poles in a DC machine depends on:

• Shaft length

• Supply voltage

• Speed

• Design specifications