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Two alternators A and B are operating in parallel. If the excitation of A is increased, then:
- a)the reactive power of A is increased while that of B is unchanged
- b)the reactive power of A is decreased
- c)both real and reactive power of A are increased
- d)the reactive power of A is increased while that of B is decreased
Correct answer is option 'D'. Can you explain this answer?
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Two alternators A and B are operating in parallel. If the excitation o...
If field current or excitation of an alternator A is increased, then it will have the following effect on the alternator working in parallel operation.
- The system terminal voltage will increase, as both alternators are not connected to the infinite bus
- The reactive power supplied by alternator A is increased, while the reactive power supplied by the other alternator B is decreased, as the total reactive power demand of the load is constant
Important Point:
Change in excitation directly affect the reactive power supplied by the alternator.
- Under excited alternator works at a leading power factor
- Normal excited alternator works at a unity power factor
- The overexcited alternator works at lagging power factor
For Synchronous motor, it is opposite of alternator.
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Two alternators A and B are operating in parallel. If the excitation o...
Understanding Alternators in Parallel Operation
When two alternators operate in parallel, their performance is interconnected. This means that changes to one alternator can impact the other.
Effect of Increasing Excitation in Alternator A
- Excitation and Reactive Power:
- Increasing the excitation of alternator A boosts its field current, enhancing its ability to generate reactive power (VARs).
- Reactive Power Contribution:
- As A increases its reactive power output, it takes on more of the system's reactive power demand.
- Impact on Alternator B:
- Since the two alternators are connected to the same bus, the total reactive power supplied to the system must remain balanced.
- Therefore, as alternator A supplies more reactive power, alternator B must compensate by supplying less reactive power.
Conclusion
- When the excitation of A is increased, it results in:
- An increase in reactive power output from A.
- A corresponding decrease in the reactive power output from B to maintain the balance in the system.
Thus, the correct answer is indeed option 'D': "The reactive power of A is increased while that of B is decreased." This illustrates the principle of load sharing in parallel operation, where the total reactive power remains constant while individual contributions can vary based on excitation changes.
When two alternators operate in parallel, their performance is interconnected. This means that changes to one alternator can impact the other.
Effect of Increasing Excitation in Alternator A
- Excitation and Reactive Power:
- Increasing the excitation of alternator A boosts its field current, enhancing its ability to generate reactive power (VARs).
- Reactive Power Contribution:
- As A increases its reactive power output, it takes on more of the system's reactive power demand.
- Impact on Alternator B:
- Since the two alternators are connected to the same bus, the total reactive power supplied to the system must remain balanced.
- Therefore, as alternator A supplies more reactive power, alternator B must compensate by supplying less reactive power.
Conclusion
- When the excitation of A is increased, it results in:
- An increase in reactive power output from A.
- A corresponding decrease in the reactive power output from B to maintain the balance in the system.
Thus, the correct answer is indeed option 'D': "The reactive power of A is increased while that of B is decreased." This illustrates the principle of load sharing in parallel operation, where the total reactive power remains constant while individual contributions can vary based on excitation changes.
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Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer?
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Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer?.
Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer?.
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Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Two alternators A and B are operating in parallel. If the excitation of A is increased, then:a)the reactive power of A is increased while that of B is unchangedb)the reactive power of A is decreasedc)both real and reactive power of A are increasedd)the reactive power of A is increased while that of B is decreasedCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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