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In an alternator, frequency per revolution is equal to
- a)number of poles
- b)twice the number of poles
- c)speed in rps
- d)number of pole-pairs
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
In an alternator, frequency per revolution is equal toa)number of pole...
For a P-pole machine, in n rev/sec, P/2n cycles/second are generated and cycles per second is referred to as frequency f of the EMF wave. Here in this question n=1
⇒ frequency per revolution = P/2
⇒ number of pole pairs.
⇒ frequency per revolution = P/2
⇒ number of pole pairs.
Most Upvoted Answer
In an alternator, frequency per revolution is equal toa)number of pole...
Frequency per revolution in an alternator
Frequency per revolution is an important parameter in an alternator. It is defined as the number of complete cycles of alternating current produced per revolution of the rotor of the alternator. The frequency of the output voltage of an alternator is directly proportional to the speed of the rotor.
Formula to calculate frequency per revolution
The formula to calculate frequency per revolution in an alternator is given as:
f = P/2N
Where,
f = frequency per revolution
P = number of pole-pairs
N = speed in revolutions per second (rps)
Explanation of the formula
The frequency of the output voltage of an alternator is given by the formula:
f = (P/2) × (N/60)
Where,
f = frequency
P = number of poles
N = rotational speed in RPM
Since the frequency per revolution is the number of cycles produced per revolution, we can express f as:
f = (P/2)
Thus, frequency per revolution is directly proportional to the number of pole-pairs in the alternator.
The speed of the rotor is also a factor that affects the frequency per revolution. The faster the rotor rotates, the higher the frequency per revolution. Therefore, frequency per revolution is inversely proportional to the speed of the rotor.
Conclusion
In conclusion, frequency per revolution in an alternator is directly proportional to the number of pole-pairs and inversely proportional to the speed of the rotor. The formula to calculate frequency per revolution is f = P/2N, where P is the number of pole-pairs and N is the speed in revolutions per second (rps).
Frequency per revolution is an important parameter in an alternator. It is defined as the number of complete cycles of alternating current produced per revolution of the rotor of the alternator. The frequency of the output voltage of an alternator is directly proportional to the speed of the rotor.
Formula to calculate frequency per revolution
The formula to calculate frequency per revolution in an alternator is given as:
f = P/2N
Where,
f = frequency per revolution
P = number of pole-pairs
N = speed in revolutions per second (rps)
Explanation of the formula
The frequency of the output voltage of an alternator is given by the formula:
f = (P/2) × (N/60)
Where,
f = frequency
P = number of poles
N = rotational speed in RPM
Since the frequency per revolution is the number of cycles produced per revolution, we can express f as:
f = (P/2)
Thus, frequency per revolution is directly proportional to the number of pole-pairs in the alternator.
The speed of the rotor is also a factor that affects the frequency per revolution. The faster the rotor rotates, the higher the frequency per revolution. Therefore, frequency per revolution is inversely proportional to the speed of the rotor.
Conclusion
In conclusion, frequency per revolution in an alternator is directly proportional to the number of pole-pairs and inversely proportional to the speed of the rotor. The formula to calculate frequency per revolution is f = P/2N, where P is the number of pole-pairs and N is the speed in revolutions per second (rps).
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In an alternator, frequency per revolution is equal toa)number of polesb)twice the number of polesc)speed in rpsd)number of pole-pairsCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In an alternator, frequency per revolution is equal toa)number of polesb)twice the number of polesc)speed in rpsd)number of pole-pairsCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an alternator, frequency per revolution is equal toa)number of polesb)twice the number of polesc)speed in rpsd)number of pole-pairsCorrect answer is option 'D'. Can you explain this answer?.
In an alternator, frequency per revolution is equal toa)number of polesb)twice the number of polesc)speed in rpsd)number of pole-pairsCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In an alternator, frequency per revolution is equal toa)number of polesb)twice the number of polesc)speed in rpsd)number of pole-pairsCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an alternator, frequency per revolution is equal toa)number of polesb)twice the number of polesc)speed in rpsd)number of pole-pairsCorrect answer is option 'D'. Can you explain this answer?.
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