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Power factor of an alternator driven by constant prime mover input can be changed by changing its
- a)speed
- b)load
- c)field excitation
- d)phase sequence
Correct answer is option 'C'. Can you explain this answer?
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Power factor of an alternator driven by constant prime mover input can...
Power Factor of an Alternator
An alternator is an electrical machine that converts mechanical energy into electrical energy. It consists of a rotor and a stator, where the rotor rotates inside the stator. The stator has a set of stationary windings, and the rotor has a set of rotating windings. The rotation of the rotor inside the stator induces an electrical current in the stator windings.
Power factor is a measure of the efficiency of an electrical system in delivering power to the load. It is defined as the ratio of the real power to the apparent power. The power factor of an alternator can be changed by changing its field excitation.
Field Excitation
The field excitation of an alternator is the current that is passed through the field winding of the rotor. The field winding is a set of coils that generate a magnetic field when a current is passed through them. The magnetic field of the rotor induces an electrical current in the stator windings, which is then delivered to the load.
Changing the field excitation of an alternator changes the strength of the magnetic field of the rotor. This, in turn, changes the voltage and current generated by the alternator. The power factor of the alternator is directly related to the voltage and current generated by the alternator.
When the field excitation of an alternator is increased, the voltage and current generated by the alternator also increase. This increases the real power delivered to the load, but the apparent power also increases, which decreases the power factor. Conversely, when the field excitation of an alternator is decreased, the voltage and current generated by the alternator decrease, which decreases the real power delivered to the load but increases the power factor.
Conclusion
In conclusion, the power factor of an alternator can be changed by changing its field excitation. By adjusting the field excitation, the voltage and current generated by the alternator can be changed, which affects the real power and apparent power delivered to the load. The power factor is directly related to the real power and apparent power, so changing the field excitation can change the power factor.
An alternator is an electrical machine that converts mechanical energy into electrical energy. It consists of a rotor and a stator, where the rotor rotates inside the stator. The stator has a set of stationary windings, and the rotor has a set of rotating windings. The rotation of the rotor inside the stator induces an electrical current in the stator windings.
Power factor is a measure of the efficiency of an electrical system in delivering power to the load. It is defined as the ratio of the real power to the apparent power. The power factor of an alternator can be changed by changing its field excitation.
Field Excitation
The field excitation of an alternator is the current that is passed through the field winding of the rotor. The field winding is a set of coils that generate a magnetic field when a current is passed through them. The magnetic field of the rotor induces an electrical current in the stator windings, which is then delivered to the load.
Changing the field excitation of an alternator changes the strength of the magnetic field of the rotor. This, in turn, changes the voltage and current generated by the alternator. The power factor of the alternator is directly related to the voltage and current generated by the alternator.
When the field excitation of an alternator is increased, the voltage and current generated by the alternator also increase. This increases the real power delivered to the load, but the apparent power also increases, which decreases the power factor. Conversely, when the field excitation of an alternator is decreased, the voltage and current generated by the alternator decrease, which decreases the real power delivered to the load but increases the power factor.
Conclusion
In conclusion, the power factor of an alternator can be changed by changing its field excitation. By adjusting the field excitation, the voltage and current generated by the alternator can be changed, which affects the real power and apparent power delivered to the load. The power factor is directly related to the real power and apparent power, so changing the field excitation can change the power factor.
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Power factor of an alternator driven by constant prime mover input can be changed by changing itsa)speedb)loadc)field excitationd)phase sequenceCorrect answer is option 'C'. Can you explain this answer?
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Power factor of an alternator driven by constant prime mover input can be changed by changing itsa)speedb)loadc)field excitationd)phase sequenceCorrect answer is option 'C'. 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 Power factor of an alternator driven by constant prime mover input can be changed by changing itsa)speedb)loadc)field excitationd)phase sequenceCorrect answer is option 'C'. 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 Power factor of an alternator driven by constant prime mover input can be changed by changing itsa)speedb)loadc)field excitationd)phase sequenceCorrect answer is option 'C'. Can you explain this answer?.
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