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The ‘synchronous-impedance method’ of finding the voltage regulation by a cylindrical rotor alternator is generally considered as
- a)a pessimistic method because saturation is not considered
- b)an optimistic method because saturation is not considered
- c)a fairly accurate method even if power factor is not taken into account while determining synchronous impedance
- d)a fairly accurate method when power factor is taken into account while determining synchronous impedance
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
The ‘synchronous-impedance method’ of finding the voltage ...
As unsaturated value of Zs is more than the saturated value, voltage regulation computed by emf method is much higher than the actual value. It is because of this reason that the emf method is called a pessimistic method.
Most Upvoted Answer
The ‘synchronous-impedance method’ of finding the voltage ...
Synchronous-impedance method is a commonly used method to find the voltage regulation of a cylindrical rotor alternator. It is based on the assumption that the rotor of the alternator has a uniform distribution of magnetic poles and that the rotor and stator are aligned perfectly. The method involves finding the synchronous impedance, which is the ratio of the open-circuit voltage to the short-circuit current at synchronous speed.
Pessimistic Method
The synchronous-impedance method is considered a pessimistic method because it does not consider the saturation of the rotor iron. Saturation occurs when the magnetic flux density in the rotor iron reaches its maximum value, which causes a reduction in the inductance of the rotor. This reduction in inductance results in an increase in the rotor current and a decrease in the output voltage, which is not taken into account in the synchronous-impedance method.
Optimistic Method
The synchronous-impedance method is not considered an optimistic method because it does not consider the effects of saturation, which can cause the voltage regulation to be higher than predicted. An optimistic method would assume that the alternator operates at its ideal conditions, which is not the case in practice.
Accuracy of Method
The synchronous-impedance method can be a fairly accurate method of finding the voltage regulation of a cylindrical rotor alternator, especially when the power factor is taken into account while determining the synchronous impedance. However, the method does not take into account the effects of saturation, which can result in a higher voltage regulation than predicted.
Conclusion
In conclusion, the synchronous-impedance method is a commonly used method to find the voltage regulation of a cylindrical rotor alternator. However, it is considered a pessimistic method because it does not consider the effects of saturation, which can result in a higher voltage regulation than predicted.
Pessimistic Method
The synchronous-impedance method is considered a pessimistic method because it does not consider the saturation of the rotor iron. Saturation occurs when the magnetic flux density in the rotor iron reaches its maximum value, which causes a reduction in the inductance of the rotor. This reduction in inductance results in an increase in the rotor current and a decrease in the output voltage, which is not taken into account in the synchronous-impedance method.
Optimistic Method
The synchronous-impedance method is not considered an optimistic method because it does not consider the effects of saturation, which can cause the voltage regulation to be higher than predicted. An optimistic method would assume that the alternator operates at its ideal conditions, which is not the case in practice.
Accuracy of Method
The synchronous-impedance method can be a fairly accurate method of finding the voltage regulation of a cylindrical rotor alternator, especially when the power factor is taken into account while determining the synchronous impedance. However, the method does not take into account the effects of saturation, which can result in a higher voltage regulation than predicted.
Conclusion
In conclusion, the synchronous-impedance method is a commonly used method to find the voltage regulation of a cylindrical rotor alternator. However, it is considered a pessimistic method because it does not consider the effects of saturation, which can result in a higher voltage regulation than predicted.
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The ‘synchronous-impedance method’ of finding the voltage regulation by a cylindrical rotor alternator is generally considered asa)a pessimistic method because saturation is not consideredb)an optimistic method because saturation is not consideredc)a fairly accurate method even if power factor is not taken into account while determining synchronous impedanced)a fairly accurate method when power factor is taken into account while determining synchronous impedanceCorrect answer is option 'A'. Can you explain this answer?
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