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A 100KVA DC GENERATOR HAS ARMATURE RESISTANCE 0.02 OHMS AND A SERIES FIELD RESISTANCE 0.004 OHMS WHAT IS THE ARMATURE GENETATED VOLTAGE?
Wiki User
∙ 9y ago
There is not enough information to answer the question. A DC generator is never described in kVA because DC generators are specified in terms of kilowatts.
Wiki User
∙ 9y ago
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What kind of current flows in the armature conductor of a dc generator?
pogi current flow in the armature conductor
A 220volts series motor takes 15amperes and runs at 700rpm the armature resistance of the series winding is 0.8 ohms at what speed will it run if resistance is connected in series with supply voltage?
It will run slower because the resistance in series with the motor will take some of the voltage and thereby reduce the current to the armature windings (less magnetic field).
What is the need of commutator in DC generator?
The commutator has two functions: (1) it enables current to pass to the external fixed wiring from the rotating armature, and (2) it is a rotating rectifier, which converts the a.c. voltage generated in the rotating armature, to a d.c. voltage.
What is the magnetization characteristic of the DC machine?
magnetisation characteristic of dc generator is nothing but the open circuit characteristic of dc generator where we determine the operating characteristics of dc machines.it is used to determine the open circuit armature voltage keeping armature current zero,at rated speed and after few laps of time filed current is gonig to be raised from zero.where the armature open circuit voltage is reached above its rated value. '
Why does the induced emf known as back emf?
In a dc motor the voltage generated in the armature acts against the supply voltage. The current is the voltage difference divided by the armature resistance. If the rotor is turned faster so that the back emf exceeds the supply voltage, the current goes the other way and the motor has become a generator.
What is the excitation system in a generator used for?
The excitation system is used to control the excitation of the rotating field in the armature. By increasing the armature current, it in turn increases the magnetic flux in the armature coil. This has the effect of increasing the voltage output of the generator. By lowering the armature current this in turn lowers the generator output voltage. The generator's voltage regulator automatically adjusts the output voltage continuously as the applied load on the generator changes.
What are the responses of fall of terminal voltage of a separately excited dc generator?
reactance,armature ohmic resistance(Ri) and armature reaction V=E-IaRa-Ia if Ia is small the voltage will be small too It=Ie-IL
What kind of current flows in the armature conductor of a dc generator?
pogi current flow in the armature conductor
How does a voltage regulator regulate the voltage output of an ac generator?
Generator output is controlled by voltage feedback to the voltage regulator which senses voltage drop or rise and regulates the current being sent to the armature. This rise and fall of the armature current governs the generators output voltage.
What will happen to the generator voltage when the load fluctuates in distribution board?
The generator's voltage regulator will sense the fluctuation. If the voltage goes low more current will be applied to the armature to compensate. If the voltage goes high less current will be applied to the armature to compensate.
If A generator has an armature resistance of 0.6 ohms and when connected to a load of 40.9 ohms passes a current of 3.5 A what is the terminal voltage and generated EMF?
145.25 v
What happens at the rated value of the voltage of the generator?
The rated voltage of a generator decreases due to many causes such as armature reaction, overloading of the generator and AVR failure/ weak excitation voltage.
Why is alternating voltage induced in the rotating armature of a generator?
The windings of the armature are constantly cutting magnetic lines of force of opposite polarities
Why terminal voltage of a self excited shunt generator decreases with an increase of load?
When the generator is loaded, flux per pole is reduced due to armature reaction.
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.
How does a small generator produce current?
It doesn't! It produces voltage. It does this by the relative movement between an armature (winding into which a voltage is induced) and a magnetic field (set up by field windings). Either the armature rotates inside a fixed field (small generators) or the field rotates within a fixed armature (larger generators).Current is only supplied when a load is connected to the generator.
What is the use of magnetization curve of DC shunt generator?
The armature voltage is a critical parameter in the determination of performance characteristics for the DC machine. The armature voltage has been shown to be proportional to the magnetic flux density per pole and the armature speed. Thus, the armature voltage will also exhibit nonlinear behavior when saturation occurs. The analysis of DC machine performance typically requires that the characteristics of the armature voltage saturation be known. This information is typically provided in a plot of the armature voltage vs. field current (magnetization curve) for a given operating speed
