10 Questions
What is another name for the external characteristic of a generator?
Performance characteristic or load characteristic
What does the curve AC represent in a separately excited DC generator?
On-load generated emf Eg vs. load current IL
Why is the on-load generated emf less than the no-load voltage in a DC generator?
Due to the demagnetizing effect of armature reaction
What does the curve AD represent in a DC generator?
Terminal voltage vs. load current (external characteristic)
In a DC series generator, how is the field winding connected?
In series with armature and load
What does the curve OC represent in a DC series generator?
Internal characteristic
How does the terminal voltage change with load current in a DC series generator?
Increases with load current initially, then decreases beyond a certain limit
What happens to the terminal voltage when the load current and field current increase beyond a certain limit in a DC series generator?
Terminal voltage starts decreasing
What is the relationship between load current and field current in a DC series generator?
IL = If (load current is similar to field current)
Why are external characteristics important in determining the suitability of a generator for a specific purpose?
To assess the performance and load characteristics
Test your knowledge on compound generators and their characteristics such as over compounding. Learn about the effects of armature reaction and how series winding amp-turns adjustment can impact the terminal voltage.
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