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poles are partially magnetized this causes some voltage called residual voltage


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Q: What is meant by residual voltage in a dc generator?
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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 the probable cause for no voltage generated in a DC compound generator?

In any DC generator the causes to fail to produce voltage is loss of residual flux in the field or fields , poor brush contact in the commutator(clean the brushes and commutator) , check all the terminals of the generator and voltmeter may not be functioningand lastly check the coupling and the prime mover is rotating.


What is commutation in DC machines?

It is the process of conversion of generated ac voltage into the armature of a dc generator to dc voltage at the terminal of the dc generator by use of pair of brushes and commutator. OR It is the process of conversion of given dc voltage at the terminal of the dc motor to ac voltage in the armature windings in a dc motor by use of pair of brushes and commutator.


What are the factor affecting voltage build up of dc generator?

List the factors that affect the voltage building in D.C generator.


What is meant by flashing a field in excitation?

A generator needs to have residual magnetism in its field coils to start the generation of electricity. A generator that has not been run in a long time will loose this magnetism. Because the field voltage is a DC supply, a battery across the field wiring will energize the coils instantaneously. Doing this several times will cause sparking when the contact to the battery is broken, hence the flash. This intermittent energizing and de-energizing will bring the residual magnetism back into the field coils. When the generator is started, the voltage output should rise to its normal level. If it does the magnetizing of the field coils to bring back the residual magnetism will have worked.


What do you mean by DC generator?

DC generator is used to produce direct current. The basic DC generator have four basic parts 1. A magnetic field 2. A single conductor or loop 3. A commutator 4. Brushes


What circuitry converts an ac voltage into dc voltage?

either a rectifier or a motor generator


What is demagnetising effect of DC generator?

demagnetising effect of dc generator is to reduce main field flux there by reduction in generated voltage.


Does a generator produce ac or DC voltage?

NO, generator always generating AC current,when commutator is used,at that time AC is converted in DC.and due to this generator is called dc generator.


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


What is meant by DC-DC luo converter?

luo converter is a new technique adopted for dc to dc voltage lifting(dc voltage boosting)...


What type of voltage is the output at the bat terminal of the ac generator?

dc