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What does an increase in field strength in a dc generator causes a?
increased Back emf
What is the difference between a DC motor and a generator in terms of EMF?
During the operation of a DC motor, EMF is created across its terminals using an external source. Whereas, in a DC generator EMF is created across its terminal based on principle of dynamically induced EMF. So talking in terms of EMF, in DC motor EMF is consumed by the motor coil and utilized to rotate the axle. On the other hand, in DC generator EMF developed across coil is transfered to a load or a battery and consumed by them.
Why Back EMF occur in only dc motor?
It doesn't. It exists in all electrical machines, d.c. or a.c., motor, generator, or transformer.
How do you prove the existence of back EMF?
How do you proof of the existence of back emf ?
What is the meaning of E in electric generators?
E is normally back emf ,v is supply voltage as per machine theory ......for generator E>v for motors V>E ......................................back emf will be in armature of machine.....................................................AnswerUnfortunately, if you are referring to the symbol for voltage, then there is no standard. The above answer is correct for some texts but, often, 'E' represents 'electromotive force', which is the open-circuit potential difference of the generator.
What does an increase in field strength in a dc generator causes a?
increased Back emf
Explain how the induction motor gets loaded when the DC generator is loaded?
when the dc generator is loaded current will be drawn from it, therefore a back emf Will be generated, which opposes the motion of a generator, and hence, that opposition loads the three phase generator
What is the difference between a DC motor and a generator in terms of EMF?
During the operation of a DC motor, EMF is created across its terminals using an external source. Whereas, in a DC generator EMF is created across its terminal based on principle of dynamically induced EMF. So talking in terms of EMF, in DC motor EMF is consumed by the motor coil and utilized to rotate the axle. On the other hand, in DC generator EMF developed across coil is transfered to a load or a battery and consumed by them.
Why Back EMF occur in only dc motor?
It doesn't. It exists in all electrical machines, d.c. or a.c., motor, generator, or transformer.
How do you prove the existence of back EMF?
How do you proof of the existence of back emf ?
What is the meaning of E in electric generators?
E is normally back emf ,v is supply voltage as per machine theory ......for generator E>v for motors V>E ......................................back emf will be in armature of machine.....................................................AnswerUnfortunately, if you are referring to the symbol for voltage, then there is no standard. The above answer is correct for some texts but, often, 'E' represents 'electromotive force', which is the open-circuit potential difference of the generator.
What will happen if generator is overexcited?
if a generator is overexcited it is producing a large amount of reactive power which requires an increase in the alternator emf. To produce this emf, the rotor currents must increase resulting in extreme ohmic rotor losses.
What is the relationship between the speed of a generator and its voltage and the torque on the generator shaft and the current produced by the generator?
emf produced by generator(E)=no. of turns in coil*rate of change of magnetic flux
Operation of DC generator?
1) PRINCIPLE:Whenever a conductor cuts magnetic flux, dynamically induced emf is produced in it. ( Faraday's Laws of Electromagnetic Induction ). This emf causes a current to flow if the conductor circuit is closed.2 ) OPERATION:Field winding produces magnetic field in D.C. generator. Armature is coupled to the prime mover. Prime mover produces torque so the armature rotates. The armature cuts the magnetic field so the emf is induced in the armature. When load is connected to the armature, electric current flows from the armature conductors, through load and back to the armature conductors. Now, as current flows through the armature and it is in the magnetic field, torque is produced due to it. (This torque is called back torque). If the load on the generator is increased, the back torque increases so the torque of the prime mover also increases and the input power to the prime mover increases. In this way, the generator converts mechanical energy into electrical energy.It should be observed that the emf induced in D.C. generator, is A.C. ( so the emf induced in the armature is alternating in nature. ). Then with the help of commutator, it is converted into D.C. Rings and brushes are used to take the emf outside.
What is back motor effect in generator?
When current is induced in the rotating coil in an electric generator then a counter couple acts on the current carrying rotating coil in the magnetic field(in accordance to the principle of dc motor). This counter couple is called back motor effect.
Why a dc generator you unable to generate emf even its armature is rotating?
bad connection
Why motor rheostat kept minimum position generator rheostat maximum position?
the back emf increases so that high currents doesn't pass through the field windings
