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A 50 Hz synchronous generator is initially connected to a long lossless transmission line which is open circuited at the receiving end. With the field voltage held constant, the generator is disconnected from the transmission line. Which of the following may be said about the steady state terminal voltage and field current of the generator?
  • a)
    The magnitude of terminal voltage decreases, and the field current does not change.
  • b)
    The magnitude of terminal voltage increases, and the field current does not change.
  • c)
    The magnitude of terminal voltage increases, and the field current increases.
  • d)
    The magnitude of terminal voltage does not change and the field current decreases.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A 50 Hz synchronous generator is initially connected to a long lossles...
A long transmission line under no-load conditions behaves as the capacitive load. The effect of armature current is purely magnetization. When the alternator is disconnected, there is no magnetizing effect. So the terminal voltage decreases with the same field current.
Explanation:
When the generator is connected to an open-circuit transmission line, the line draws a charging current, therefore Vt > Eg.

But, when the generator is disconnected from the line, no charging current is delivered by the generator, i.e.,
Ic = 0 ⇒ Vt = Eg.
So, the terminal voltage decreases.
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Most Upvoted Answer
A 50 Hz synchronous generator is initially connected to a long lossles...
A long transmission line under no-load conditions behaves as the capacitive load. The effect of armature current is purely magnetization. When the alternator is disconnected, there is no magnetizing effect. So the terminal voltage decreases with the same field current.
Explanation:
When the generator is connected to an open-circuit transmission line, the line draws a charging current, therefore Vt > Eg.

But, when the generator is disconnected from the line, no charging current is delivered by the generator, i.e.,
Ic = 0 ⇒ Vt = Eg.
So, the terminal voltage decreases.
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A 50 Hz synchronous generator is initially connected to a long lossless transmission line which is open circuited at the receiving end. With the field voltage held constant, the generator is disconnected from the transmission line. Which of the following may be said about the steady state terminal voltage and field current of the generator?a)The magnitude of terminal voltage decreases, and the field current does not change.b)The magnitude of terminal voltage increases, and the field current does not change.c)The magnitude of terminal voltage increases, and the field current increases.d)The magnitude of terminal voltage does not change and the field current decreases.Correct answer is option 'A'. Can you explain this answer?
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A 50 Hz synchronous generator is initially connected to a long lossless transmission line which is open circuited at the receiving end. With the field voltage held constant, the generator is disconnected from the transmission line. Which of the following may be said about the steady state terminal voltage and field current of the generator?a)The magnitude of terminal voltage decreases, and the field current does not change.b)The magnitude of terminal voltage increases, and the field current does not change.c)The magnitude of terminal voltage increases, and the field current increases.d)The magnitude of terminal voltage does not change and the field current decreases.Correct answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A 50 Hz synchronous generator is initially connected to a long lossless transmission line which is open circuited at the receiving end. With the field voltage held constant, the generator is disconnected from the transmission line. Which of the following may be said about the steady state terminal voltage and field current of the generator?a)The magnitude of terminal voltage decreases, and the field current does not change.b)The magnitude of terminal voltage increases, and the field current does not change.c)The magnitude of terminal voltage increases, and the field current increases.d)The magnitude of terminal voltage does not change and the field current decreases.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 50 Hz synchronous generator is initially connected to a long lossless transmission line which is open circuited at the receiving end. With the field voltage held constant, the generator is disconnected from the transmission line. Which of the following may be said about the steady state terminal voltage and field current of the generator?a)The magnitude of terminal voltage decreases, and the field current does not change.b)The magnitude of terminal voltage increases, and the field current does not change.c)The magnitude of terminal voltage increases, and the field current increases.d)The magnitude of terminal voltage does not change and the field current decreases.Correct answer is option 'A'. Can you explain this answer?.
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