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If a P-pole alternator rotates N completes rotations, it produces ________ cycles of generated voltage. (As N in the number of rotations made per second)
- a)NP/2
- b)P/2N
- c)2N/P
- d)2NP
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
If a P-pole alternator rotates N completes rotations, it produces ____...
We know that synchronous speed in an alternator is given by
Ns is synchronous speed in rpm
f is frequency or number of cycles
P is the number of poles
Given that, speed is N rps = 60 N rpm
Ns is synchronous speed in rpm
f is frequency or number of cycles
P is the number of poles
Given that, speed is N rps = 60 N rpm
Most Upvoted Answer
If a P-pole alternator rotates N completes rotations, it produces ____...
Explanation:
When a P-pole alternator rotates N complete rotations, it means that the rotor has made N revolutions. Here, P represents the number of poles on the rotor.
Understanding the concept:
An alternator consists of a rotor and a stator. The rotor rotates due to some external force, while the stator remains stationary. The rotor contains a certain number of poles (P), which are evenly distributed around its circumference.
Generated voltage:
As the rotor rotates, the magnetic field created by the rotor poles cuts across the stator windings, generating an induced voltage. This induced voltage is known as the generated voltage.
Relation between rotations and cycles of voltage:
- When the rotor makes one complete rotation, each pole passes by each stator winding once.
- Since the rotor has P poles, this means that P cycles of voltage are generated in one rotation of the rotor.
- Therefore, when the rotor makes N complete rotations, it produces N * P cycles of generated voltage.
Conversion to cycles per second:
The question states that N is the number of rotations made per second. To convert the cycles of voltage to cycles per second, we need to multiply by the frequency of rotation (f).
- Frequency (f) is the number of cycles per second.
- The frequency of rotation is equal to the number of rotations per second, which is N.
- Therefore, f = N cycles per second.
Final answer:
From the above reasoning, when the rotor makes N complete rotations, it produces N * P cycles of generated voltage.
Hence, the correct answer is option A: NP/2.
When a P-pole alternator rotates N complete rotations, it means that the rotor has made N revolutions. Here, P represents the number of poles on the rotor.
Understanding the concept:
An alternator consists of a rotor and a stator. The rotor rotates due to some external force, while the stator remains stationary. The rotor contains a certain number of poles (P), which are evenly distributed around its circumference.
Generated voltage:
As the rotor rotates, the magnetic field created by the rotor poles cuts across the stator windings, generating an induced voltage. This induced voltage is known as the generated voltage.
Relation between rotations and cycles of voltage:
- When the rotor makes one complete rotation, each pole passes by each stator winding once.
- Since the rotor has P poles, this means that P cycles of voltage are generated in one rotation of the rotor.
- Therefore, when the rotor makes N complete rotations, it produces N * P cycles of generated voltage.
Conversion to cycles per second:
The question states that N is the number of rotations made per second. To convert the cycles of voltage to cycles per second, we need to multiply by the frequency of rotation (f).
- Frequency (f) is the number of cycles per second.
- The frequency of rotation is equal to the number of rotations per second, which is N.
- Therefore, f = N cycles per second.
Final answer:
From the above reasoning, when the rotor makes N complete rotations, it produces N * P cycles of generated voltage.
Hence, the correct answer is option A: NP/2.
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If a P-pole alternator rotates N completes rotations, it produces ________ cycles of generated voltage. (As N in the number of rotations made per second)a)NP/2b)P/2Nc)2N/Pd)2NPCorrect answer is option 'A'. Can you explain this answer?
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