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A cumulatively compounded dc generator is supplying 20A at 200V. Now if the series field winding is short circuited, the terminal voltage
  • a)
    will remain unaltered at 200V
  • b)
    will rise to 220V
  • c)
    will short upto a very high value
  • d)
    will become less than 200V
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A cumulatively compounded dc generator is supplying 20A at 200V. Now i...
**Explanation:**

When a cumulatively compounded DC generator is supplying a load, it generates a voltage that is the sum of the voltages generated by the shunt field winding and the series field winding. The shunt field winding generates a voltage that is proportional to the field current, while the series field winding generates a voltage that is proportional to the armature current.

When the series field winding is short-circuited, the current flowing through it becomes zero. This means that the voltage generated by the series field winding also becomes zero. As a result, the total voltage generated by the generator decreases.

Here's a step-by-step explanation of why the terminal voltage will become less than 200V when the series field winding is short-circuited:

1. In a cumulatively compounded DC generator, the shunt field winding and the series field winding are connected in such a way that their voltages add up to produce the terminal voltage of the generator.

2. The shunt field winding generates a voltage that is proportional to the field current. When the series field winding is short-circuited, the field current remains unchanged. Therefore, the voltage generated by the shunt field winding remains the same.

3. The series field winding generates a voltage that is proportional to the armature current. When the series field winding is short-circuited, the armature current still flows through the armature winding, but it no longer flows through the series field winding. Therefore, the voltage generated by the series field winding becomes zero.

4. Since the voltage generated by the series field winding becomes zero, the total voltage generated by the generator decreases. This means that the terminal voltage of the generator will become less than 200V.

Therefore, the correct option is D) the terminal voltage will become less than 200V.
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A cumulatively compounded dc generator is supplying 20A at 200V. Now if the series field winding is short circuited, the terminal voltagea)will remain unaltered at 200Vb)will rise to 220Vc)will short upto a very high valued)will become less than 200VCorrect answer is option 'D'. Can you explain this answer?
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