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List the factors that affect the voltage building in D.C generator.
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If a selfexcited generator has lost all of its residual magnetism can it build up an output voltage?
yes
What is residual voltage for DC generator?
This case arises only in series dc generator current should be sent around the poles to magnetize. this current can the source(generator). current is passed through poles if it is loaded. but if it is not loaded current is zero through the field. load voltage should be zero actually.but this dont happen.we use generator frequently.due to this poles are partially magnetized this causes some voltage appear called residual voltageAnswerThere's no such thing as 'residual voltage'; you're confusing it with 'residual magnetism', which exists in the magnetic poles of a self-excited d.c. generator and which enables the build-up of its terminal voltage.
What is critical resistance of the field circuit of a DC generator?
The value of resistance of shunt field winding beyond which the shunt generator fails to build up its voltage is known as " critical resistance at a given speed it is the maximum field resistance with which the shunt generator excite.
What will happen if the generator rotates in the opposite direction from that specified?
If the rotation is reversed in DC generator the permanent magnetism already occurred for voltage build up process may demagnetize. this will causes no emf induce at starting time.The reversal of rotation is not affect externally excited generators
Why a dc shunt generator may fail to self excite?
If there is no residual magnetism in the field poles then there would be no flux too induce the initial voltage for self exitation
How the doubly fed induction generator build up voltage?
If a self-excited generator lost all its residual magnetism, can it build up an output voltage?
If a selfexcited generator has lost all of its residual magnetism can it build up an output voltage?
yes
How voltage build-up in a self-excited generator?
What can usually happen is the permanent magnets in the generator will become energized, and like static shocks, will store energy in them.
What is residual voltage for DC generator?
This case arises only in series dc generator current should be sent around the poles to magnetize. this current can the source(generator). current is passed through poles if it is loaded. but if it is not loaded current is zero through the field. load voltage should be zero actually.but this dont happen.we use generator frequently.due to this poles are partially magnetized this causes some voltage appear called residual voltageAnswerThere's no such thing as 'residual voltage'; you're confusing it with 'residual magnetism', which exists in the magnetic poles of a self-excited d.c. generator and which enables the build-up of its terminal voltage.
What is critical resistance of the field circuit of a DC generator?
The value of resistance of shunt field winding beyond which the shunt generator fails to build up its voltage is known as " critical resistance at a given speed it is the maximum field resistance with which the shunt generator excite.
What are the condition of building up a self excited shunt generator?
self excited generator must be started without any external load attached ,an external load will continuously drain off the build up voltage and prevent the generator from reaching its proper operating voltage. also the presence of residual magnetism plays an important role And the field current resistance should be less than critic field circuit resistance
What will happen if the generator rotates in the opposite direction from that specified?
If the rotation is reversed in DC generator the permanent magnetism already occurred for voltage build up process may demagnetize. this will causes no emf induce at starting time.The reversal of rotation is not affect externally excited generators
Why a dc shunt generator may fail to self excite?
If there is no residual magnetism in the field poles then there would be no flux too induce the initial voltage for self exitation
Can a shunt generator build up its voltage without residual magnetism?
no...because before producing voltage needed to connect the generator to the grid then after it will produced voltage.AnswerYes, but only if you have an external d.c. supply to supply the field windings. Such machines are called, 'separately-excited'.
When a shunt generator fails to build up the voltage then how to rectify the fault?
It fails to build up because self excited DC motor's armature have only one direction of rotation. So that if the poles of the armature are reversed, then this causes the reduction in the residual magnetism and eventually, it will stop.
Can you build a home wind power generator in suburbia?
You should honestly be able to build a wind powered generator in any town because its the one type of generator that causes the least environmental damages. You can ask for a permit from your city hall.
What kind of maintenance is needed for a hydroelectric generator?
A hydroelectric generator does not require much maintenance. If you build it right or if you purchase a decent generator, you should not have much problems.
