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Questions and Answers
What is the purpose of the commutator in a DC machine?
What is the purpose of the commutator in a DC machine?
- To convert mechanical energy to electrical energy (correct)
- To support field coils
- To convert AC voltages to DC
- To produce alternate magnetic polarities
What is the function of the yoke in a DC machine?
What is the function of the yoke in a DC machine?
- To reduce eddy current losses
- To connect the armature winding to the commutator
- To carry the magnetic flux produced by the field winding (correct)
- To cool the machine through axial air flow
What is the difference between series and shunt field windings in a DC machine?
What is the difference between series and shunt field windings in a DC machine?
- Series field windings have higher resistance, while shunt field windings have lower resistance (correct)
- Series field windings are connected in parallel with the armature, while shunt field windings are connected in series with the armature
- Series field windings have many turns of small wire, while shunt field windings have few turns of very large wire
- Series field windings are used to limit current flow, while shunt field windings provide the magnetic field
