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If a self excited DC generator is failed to run, this refers to
- a)zero residual voltage
- b)field MMF, that it is not cumulative
- c)resistance is greater than critical resistance
- d)any of the mentioned
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
If a self excited DC generator is failed to run, this refers toa)zero ...
Any of the reasons are valid for no build up of an emf.
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If a self excited DC generator is failed to run, this refers toa)zero ...
Explanation:
When a self-excited DC generator fails to run, it means that the generator is unable to produce any output voltage. This can occur due to various reasons, such as:
1. Zero residual voltage:
In a self-excited DC generator, the initial magnetic field required for voltage generation is provided by the residual magnetism in the field poles. If the residual magnetism is insufficient or completely absent, it will result in a zero residual voltage. As a result, the generator will fail to produce any output voltage.
2. Field MMF not cumulative:
The field MMF (Magnetomotive Force) in a self-excited DC generator should be cumulative, meaning it should add up as the current flows through the field winding. If the field MMF is not cumulative, it can lead to a decrease in the strength of the magnetic field, resulting in a failure to generate voltage.
3. Resistance greater than critical resistance:
In a self-excited DC generator, there is a critical resistance value that determines the minimum amount of resistance required in the field circuit. If the resistance in the field circuit exceeds the critical resistance, it can prevent the generator from building up sufficient field current and generating voltage.
Conclusion:
Out of the given options, the correct answer is option 'A' - zero residual voltage. This is because when a self-excited DC generator fails to run, it indicates that there is no residual voltage present to initiate the generation of output voltage.
When a self-excited DC generator fails to run, it means that the generator is unable to produce any output voltage. This can occur due to various reasons, such as:
1. Zero residual voltage:
In a self-excited DC generator, the initial magnetic field required for voltage generation is provided by the residual magnetism in the field poles. If the residual magnetism is insufficient or completely absent, it will result in a zero residual voltage. As a result, the generator will fail to produce any output voltage.
2. Field MMF not cumulative:
The field MMF (Magnetomotive Force) in a self-excited DC generator should be cumulative, meaning it should add up as the current flows through the field winding. If the field MMF is not cumulative, it can lead to a decrease in the strength of the magnetic field, resulting in a failure to generate voltage.
3. Resistance greater than critical resistance:
In a self-excited DC generator, there is a critical resistance value that determines the minimum amount of resistance required in the field circuit. If the resistance in the field circuit exceeds the critical resistance, it can prevent the generator from building up sufficient field current and generating voltage.
Conclusion:
Out of the given options, the correct answer is option 'A' - zero residual voltage. This is because when a self-excited DC generator fails to run, it indicates that there is no residual voltage present to initiate the generation of output voltage.
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