11 Questions
What principle do generators use to convert mechanical motion to electrical energy?
Electromagnetic induction
Which rule should be used to determine the direction of induced emf in a coil?
Lenz's law
Why is no emf induced in a rotating coil when it passes through the neutral plane?
Due to lack of magnetic field
What component of a generator causes it to produce DC voltage instead of AC voltage?
Commutator
When should brush contact change from one commutator segment to the next?
When the coil is at neutral plane
What is the purpose of the slip rings in a generator?
To allow the coil to rotate continuously
How many commutator segments are typically required in a two-coil generator?
Four
What causes sparking between the brushes and the commutator in a generator?
Rapid change in current flow
What is the principle by which generators convert mechanical motion to electrical energy?
Electromagnetic induction
Why should brush contact change from one commutator segment to the next in a generator?
To maintain the direction of current flow in the external circuit
How can the field strength be varied in a practical DC generator?
By changing the current in the field winding
Test your knowledge on DC generators with these multiple-choice questions. Topics include principles of energy conversion, determining induced emf direction, slip rings, components for producing DC voltage, and brush contact points.
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