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For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?
- a)there must be some residual flux
- b)field winding mmf must aid the residual flux
- c)total field circuit resistance must be less than the critical value
- d)armature speed must be very high
Correct answer is option 'D'. Can you explain this answer?
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For the voltage build up of a self excited d.c. generator, which of th...
Voltage Build-up in a Self-excited DC Generator
A self-excited DC generator is a type of DC generator that does not require an external source of power to generate an EMF. The voltage build-up of a self-excited DC generator is a process by which the generator produces its own magnetic field, which in turn induces an EMF in the armature. There are four essential conditions for voltage build-up in a self-excited DC generator:
1. Residual flux: There must be some residual flux in the magnetic circuit of the generator. This residual flux can be produced by magnetizing the field poles of the generator using an external source of power.
2. Field winding MMF must aid the residual flux: When the field winding of the generator is energized, it produces a magnetic field that adds to the residual flux in the magnetic circuit. This aids in the voltage build-up process.
3. Total field circuit resistance must be less than the critical value: The total resistance of the field circuit, including the field winding and the external circuit, must be less than the critical value. This is necessary to prevent excessive voltage drop in the field circuit, which can inhibit the voltage build-up process.
4. Armature speed must be very high: The armature speed of the generator must be very high to produce a strong EMF. This is because the EMF produced by the generator is proportional to the product of the magnetic field strength and the armature speed.
Not an Essential Condition
Out of the four conditions mentioned above, the armature speed must be very high is not an essential condition for voltage build-up in a self-excited DC generator. While a high armature speed is necessary to produce a strong EMF, it is not a necessary condition for the voltage build-up process itself. The voltage build-up process can occur even if the armature speed is low, but the resulting EMF will be weak.
A self-excited DC generator is a type of DC generator that does not require an external source of power to generate an EMF. The voltage build-up of a self-excited DC generator is a process by which the generator produces its own magnetic field, which in turn induces an EMF in the armature. There are four essential conditions for voltage build-up in a self-excited DC generator:
1. Residual flux: There must be some residual flux in the magnetic circuit of the generator. This residual flux can be produced by magnetizing the field poles of the generator using an external source of power.
2. Field winding MMF must aid the residual flux: When the field winding of the generator is energized, it produces a magnetic field that adds to the residual flux in the magnetic circuit. This aids in the voltage build-up process.
3. Total field circuit resistance must be less than the critical value: The total resistance of the field circuit, including the field winding and the external circuit, must be less than the critical value. This is necessary to prevent excessive voltage drop in the field circuit, which can inhibit the voltage build-up process.
4. Armature speed must be very high: The armature speed of the generator must be very high to produce a strong EMF. This is because the EMF produced by the generator is proportional to the product of the magnetic field strength and the armature speed.
Not an Essential Condition
Out of the four conditions mentioned above, the armature speed must be very high is not an essential condition for voltage build-up in a self-excited DC generator. While a high armature speed is necessary to produce a strong EMF, it is not a necessary condition for the voltage build-up process itself. The voltage build-up process can occur even if the armature speed is low, but the resulting EMF will be weak.
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For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?a)there must be some residual fluxb)field winding mmf must aid the residual fluxc)total field circuit resistance must be less than the critical valued)armature speed must be very highCorrect answer is option 'D'. Can you explain this answer?
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For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?a)there must be some residual fluxb)field winding mmf must aid the residual fluxc)total field circuit resistance must be less than the critical valued)armature speed must be very highCorrect answer is option 'D'. 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 For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?a)there must be some residual fluxb)field winding mmf must aid the residual fluxc)total field circuit resistance must be less than the critical valued)armature speed must be very highCorrect answer is option 'D'. 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 For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?a)there must be some residual fluxb)field winding mmf must aid the residual fluxc)total field circuit resistance must be less than the critical valued)armature speed must be very highCorrect answer is option 'D'. Can you explain this answer?.
For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?a)there must be some residual fluxb)field winding mmf must aid the residual fluxc)total field circuit resistance must be less than the critical valued)armature speed must be very highCorrect answer is option 'D'. 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 For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?a)there must be some residual fluxb)field winding mmf must aid the residual fluxc)total field circuit resistance must be less than the critical valued)armature speed must be very highCorrect answer is option 'D'. 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 For the voltage build up of a self excited d.c. generator, which of the following is not anessential condition?a)there must be some residual fluxb)field winding mmf must aid the residual fluxc)total field circuit resistance must be less than the critical valued)armature speed must be very highCorrect answer is option 'D'. Can you explain this answer?.
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