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For a given dc generator, the external characteristic is plotted . Without using further plots, how can we obtain internal characteristic?
- a)By adding the IaRa drop to the plot
- b)By adding armature reaction
- c)By reducing IaRa drop
- d)All of the mentioned
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
For a given dc generator, the external characteristic is plotted . Wit...
To obtain the internal characteristic, you can:
- Add the IaRa drop to the plot
- Subtract from E0 the values of voltage drops due to armature reaction for different loads
- At large armature current, field current increases sharply to compensate for the voltage drop caused by armature reaction
Most Upvoted Answer
For a given dc generator, the external characteristic is plotted . Wit...
Adding IaRa Drop to Obtain Internal Characteristic of a DC Generator
The external characteristic of a DC generator is the relationship between the terminal voltage and the load current, obtained by plotting the voltage against the current. On the other hand, the internal characteristic of a DC generator is the relationship between the generated emf and the armature current, obtained by plotting the emf against the current.
To obtain the internal characteristic from the external characteristic, we need to account for the voltage drop across the armature resistance (IaRa drop) that reduces the terminal voltage. This drop is caused by the armature current flowing through the resistance of the armature windings.
Therefore, to obtain the internal characteristic, we can use the following steps:
1. Measure the armature resistance (Ra) of the DC generator.
2. Calculate the IaRa drop for each load current by multiplying the current by the armature resistance.
3. Subtract the IaRa drop from the terminal voltage for each load current to get the generated emf.
4. Plot the generated emf against the load current to obtain the internal characteristic.
This method helps to eliminate the effect of the armature resistance on the external characteristic and obtain the true generated emf of the DC generator.
Therefore, the correct answer is option A, by adding the IaRa drop to the plot.
The external characteristic of a DC generator is the relationship between the terminal voltage and the load current, obtained by plotting the voltage against the current. On the other hand, the internal characteristic of a DC generator is the relationship between the generated emf and the armature current, obtained by plotting the emf against the current.
To obtain the internal characteristic from the external characteristic, we need to account for the voltage drop across the armature resistance (IaRa drop) that reduces the terminal voltage. This drop is caused by the armature current flowing through the resistance of the armature windings.
Therefore, to obtain the internal characteristic, we can use the following steps:
1. Measure the armature resistance (Ra) of the DC generator.
2. Calculate the IaRa drop for each load current by multiplying the current by the armature resistance.
3. Subtract the IaRa drop from the terminal voltage for each load current to get the generated emf.
4. Plot the generated emf against the load current to obtain the internal characteristic.
This method helps to eliminate the effect of the armature resistance on the external characteristic and obtain the true generated emf of the DC generator.
Therefore, the correct answer is option A, by adding the IaRa drop to the plot.
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For a given dc generator, the external characteristic is plotted . Without using further plots, how can we obtain internal characteristic?a)By adding the IaRa drop to the plotb)By adding armature reactionc)By reducing IaRa dropd)All of the mentionedCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about For a given dc generator, the external characteristic is plotted . Without using further plots, how can we obtain internal characteristic?a)By adding the IaRa drop to the plotb)By adding armature reactionc)By reducing IaRa dropd)All of the mentionedCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For a given dc generator, the external characteristic is plotted . Without using further plots, how can we obtain internal characteristic?a)By adding the IaRa drop to the plotb)By adding armature reactionc)By reducing IaRa dropd)All of the mentionedCorrect answer is option 'A'. Can you explain this answer?.
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