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What is meant by excitation of synchronous machines?
Excitation of synchronous machines refers to the process of supplying direct current (DC) to the rotor winding to create a magnetic field, which is essential for the operation of the machine. This magnetic field interacts with the rotating magnetic field produced by the stator, enabling the machine to generate or synchronize with the grid frequency. Proper excitation is crucial for maintaining voltage levels and ensuring stable operation under varying load conditions. Inadequate or excessive excitation can lead to issues such as voltage instability or oscillations.
What is meant by the term excertation current when refering to generator?
Excitation current in a generator refers to the current supplied to the rotor windings to create a magnetic field necessary for generating electricity. This current is crucial for controlling the voltage output and overall performance of the generator. By adjusting the excitation current, operators can regulate the generator's voltage and ensure stable operation under varying load conditions.
What is meant by pole slipping?
A pole slip occurs when a motor or generator cannot maintain synchronicity. This occurs because the field excitation is too low.
What is meant b generator?
A generator is a device that converts mechanical energy into electrical energy through the process of electromagnetic induction. It typically consists of a rotor, which spins within a magnetic field, inducing an electric current in coils of wire. Generators are commonly used in power plants, portable power supplies, and various applications where electricity is needed. They can be powered by various energy sources, including fossil fuels, wind, water, or solar energy.
What is meant by parallel path in DC motor?
In a DC motor, a parallel path refers to the configuration where multiple current-carrying paths are available for the flow of electrical current within the motor windings. This design reduces the overall resistance and allows for increased current capacity, which can enhance motor performance and efficiency. Parallel paths are commonly found in the armature winding of large DC motors to improve torque and reduce heating effects. This configuration also allows for better distribution of magnetic field lines, leading to smoother operation.
What is meant by magnetic permeability?
All materials are magnetized when placed in the magnetic field . The material magnetized by the effect of a magnetic field is called magnetic permeability.
What is meant by the term diamagnetism?
Diamagnetism is weak repulsion by a magnetic field.
What is meant by tangent in physics?
when a magnetic substance in placed i two uniform magnetic field (b) and (h) which are mutually perpendicular and coplanar to each other. then the magnetic field intensity of magnetic field of b which making angle θ with h is tanθtimes of h.mathamatically B=tanθxH.
Which direction does magnetic fields flow?
I think it is a mistake to refer to magnetic field 'flowing. Magnetic fields just are, they can change, and these disturbances might move in space, but the field itself does not flow. That being said, and assuming you meant to ask in which direction a magnetic field points the answer is that a magnetic field points towards the south pole of a magnet and away from the north pole. A magnetic field cannot be divergent (i.e. there are no sources) and any field line must be closed.
What is meant by cyclotron frequency?
Cyclotron frequency refers to the frequency at which a charged particle orbits in a magnetic field. It is determined by the strength of the magnetic field and the mass and charge of the particle. The cyclotron frequency is an important parameter in understanding the behavior of charged particles in magnetic fields, such as in particle accelerators.
What is meant by diamagnetic shielding?
Diamagnetic shielding refers to the ability of a material to create a magnetic field in the opposite direction to an external magnetic field, thus reducing the overall magnetic field within the material. This shielding effect helps protect sensitive equipment or materials from the influence of external magnetic fields. Materials with diamagnetic properties include superconductors and some metals like bismuth and copper.
What is meant by Slip of an induction motor?
Slip is referred to as the difference between the speed of the rotor and the speed of the rotating magnetic field in the stator of the induction motor. Speed of the rotor=n(1-s) Speed of the rotating magnetic field= f/p
What is meant by electric and magnetic field?
A magnetic field is a area in which magnetic objects are pushed or pulled. It is caused by the alignment of parts of atoms.A field of force associated with changing electric fields , as when electric charges are in motion. Magnetic fields exert deflective forces on moving electric charges. Most magnets have magnetic fields as a result of the spinning motion of the electrons orbiting the atoms of which they are composed; electromagnets create such fields from electric current moving through coils. Large objects, such as the earth, other planets, and stars, also produce magnetic fields. See Note at magnetism.
Are electromagnetic waves characterized by rarefactions and compressions?
No they are caused by changes in magnetic and electrical fields. When a magnetic field changes it causes an electric field that is perpendicular to it. And vice versa a changing electric field causes a perpendicular magnetic field. These changing fields propagate outwards at the speed of light and are what is meant by an electromagnetic wave.
How will calculate the power of magnet?
The electric power is measured the same as in any other electric circuit, in watts. You calculate this by multiplying the current (in amps) by the potential difference (in volts) across the circuit. So: P = I V If you meant how do we measure the strength of the magnetic field generated, there are two different vector fields that may be called "magnetic field". These are the H-field and the B-field. The H-field may also be called the "magnetic field intensity", the "magnetic field strength", the "auxiliary magnetic field" or the "magnetising field". It is measured in amps per metre. The B-field may also be called the "magnetic flux density", the "magnetic induction", or the "magnetic field". It is measured in teslas.
What is meant by tangent law in physics?
when a magnetic substance in placed i two uniform magnetic field (b) and (h) which are mutually perpendicular and coplanar to each other. then the magnetic field intensity of magnetic field of b which making angle θ with h is tanθtimes of h.mathamatically B=tanθxH.
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