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What does an increase in field strength in a dc generator causes a?
Wiki User
∙ 11y ago
increased Back emf
Wiki User
∙ 11y ago
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Why does voltage increase with current with separate excitation?
More current in the field coils means a stronger magnetic field for the armature to rotate in. This causes the output voltage for a generator to increase. For a motor, more magnetic field means that the supply voltage can be matched at a slower armature rotation speed, so the motor runs more slowly but can supply more torque.
What are the differences of Long shunt vs short shunt generator?
In long shunt the shunt field winding is in parallel to both generator and series field. In short shunt the shunt field is in parallel to generator only.
How does the avr automatically maintain a constant voltage level in a generator?
The AVR (automatic voltage regulator) measures the generator voltage output and varies the field voltage (which varies the strength of the rotating magnetic field) to maintain a fixed output voltage. Some generators excite (power) the AVR and field windings from the main stator, some provide a separate stator winding just for field excitation, and others provide a separate stator winding and rotating permanent magnets (called PMG) for field excitation. The generators that do not have permanent magnets rely on residual magnetism for the initial voltage to start the system or may provide initial voltage from the engine's starting battery.
How can a 24 v battery start a 80 kw emergency generator?
The 24v battery is used to provide the initial field current. This couples to the stator windings, and as the generator spins induces a voltage on the stator windings, which causes back EMF onto the field windings (when load is present), which slows the generator's spin until the governor kicks in to bring it back up to speed. The important thing to note is the output power of the generator is not a factor of the 24v field voltage, it is directly dependent upon the fuel being used to get the generator spinning. The 24 volts just "jump starts" the field voltage. Think of it as synonymous with the 12 volt battery that starts your car.
What affect does a leading power factor have on alternator generator excitation currents?
When a leading power factor load is applied, the voltage of the genset or genset bus rises, and the voltage regulation system reduces exciter power, reducing the strength of the magnetic field. If the field fails, the generator set may slip a pole, which results in potentially catastrophic alternator damage. pawan
The amount of voltage output of the AC generator is related to?
field strength
What affect does a changing magnetic field strength have on an ac generator power output?
By increasing the field current (current flowing through the rotor windings), the magnetic field generated by these windings will increase. This increased magnetic field will result in a larger current flow in the stator windings (the output of the generator). This in turn causes a larger pull against the rotation of the rotor, causing it to slow down. The governor will then kick in, allowing more steam/ power to the prime mover to keep speed steady. Assuming all is working correctly, the output power will increase as the magnetic field is increased (to a limit).
Circle the letters of the factors that the strength of an electric field depends on.?
The strength of an electric field depends on the charge that causes it, and on the distance from the charge.
What would increase the strength of the magnetic field?
increasing the number of coils
An increase in magnification causes?
The increase in magnification cause a decrease in the field of view.
An increase in magnification causes what?
The increase in magnification cause a decrease in the field of view.
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a?
If the coil encloses an iron rod, then the magnetic field strength inside a current-carrying coil will be increased. This occurs because the air path in the coil is made shorter by putting in the rod. This in turn causes an increase in the field.
Do the induced voltage increase in a transformer when the magnetic field strength increase?
Yes, the more voltage you put in the more you get out. If the transformer is a 2 - 1 ratio and you put 240 in you get 120 out and when you put 480 in you get 240 out. Magnetic field strength and voltage have a direct relationship. +++ The field strength is actually a function of current, although as you say, increasing the voltage will increase the current hence the magnetic field.
What happens to the gravitational field strength as you increase the radius?
it will decrease as radius increase keeping mass same
Can increase the strength of an electromagnets field by?
using a stronger ferromagnetic material for the core. :)
You can increase the strength of an electromagnet field by?
using a stronger ferromagnetic material for the core. :)
Why does voltage increase with current with separate excitation?
More current in the field coils means a stronger magnetic field for the armature to rotate in. This causes the output voltage for a generator to increase. For a motor, more magnetic field means that the supply voltage can be matched at a slower armature rotation speed, so the motor runs more slowly but can supply more torque.
