0
Add your answer:
Earn +20 pts
What do you mean by residual magnetism in DC shunt generators?
The magnetic field that remains in a magnetic material ( a winding core) after the removal of electric power or the magnetizing force.
How does the starting of synchronous motor using dc generator as a load work-?
Starting of the synchronous motor using the DC generator creates a magnetic field.
What is the effect of field current on dc motor?
The field current of a dc motor provides the magnetic field that allows the motor to develop a torque when current flows through the armature..
What is armature in DC motor?
The armature has the stationary (not physically moving) magnetic field, which attracts the magnetic field in the rotor. Since DC does not alternate, a split ring is used to alternate the current (and resulting magnetic field), so that the rotor will spin.
Whats meant by radial magnetic field?
A radial magnetic field ensures that the plane of the coil (rotating within the magnetic field, in say a DC motor) is always flat within the external magnetic field ensuring maximum torque in (nearly) all positions. Hope this helps!
How do DC motors produce torque?
DC motors produce torque through the interaction between the magnetic field generated by the electromagnets in the stator and the magnetic field of the permanent magnets in the rotor. When current flows through the coils, it creates a magnetic field that interacts with the rotor's field, creating a force that rotates the rotor and produces torque.
What do you mean by residual magnetism in DC shunt generators?
The magnetic field that remains in a magnetic material ( a winding core) after the removal of electric power or the magnetizing force.
What is the classical explanation of a dc electric current in a metallic wave?
A dc electric current in a metallic wire is explained by the motion of free electrons under the influence of an electric field. When a voltage is applied across the wire, the potential difference causes the free electrons to move in a direction, creating a flow of charge which constitutes the electric current. This flow of electrons is the basis of how electrical energy is transmitted and utilized in various devices.
In an electromagnet as the electric current changes what happens to the magnetic field?
As the electric current changes in an electromagnet, the strength of the magnetic field also changes. An increase in current strength leads to a stronger magnetic field, while a decrease in current strength results in a weaker magnetic field. This ability to control the magnetic field strength makes electromagnets versatile in various applications.
Armature reaction in a DC generator?
ARMATURE REACTION in DC MachineAll current-carrying conductors produce magnetic fields. The magnetic field produced by current in the armature of a dc generator affects the flux pattern and distorts the main field. This distortion causes a shift in the neutral plane, which affects commutation. This change in the neutral plane and the reaction of the magnetic field is called armature reaction.
How can motion produce electrity?
When a charged particle moves through a magnetic field it experiences a force from that field. When an electrical conductor moves through a magnetic field the electrons, which are negatively charged, being moving, creating an electric current.
Can a electric current affect a compass?
Yes, an electric current can affect a compass. When an electric current flows through a wire, it creates a magnetic field around the wire. This magnetic field can interfere with the Earth's magnetic field that the compass relies on for navigation.
Why a current wire deflects a magnetic needle placed near it?
When current flows through a wire, it creates a magnetic field around the wire. This magnetic field interacts with the magnetic field of the needle, causing the needle to deflect. The direction of deflection depends on the direction of the current and the orientation of the needle.
Will exposing a magnet to a DC magnetic field demagnetize it?
Exposing a magnet to a DC magnetic field typically won't demagnetize it unless the field is very strong and exceeds the coercivity of the magnet. In most cases, a DC magnetic field won't affect the magnet's strength but can alter its orientation or alignment.
What is the EMF for DC machines?
Electro Magnetic Field
What are the effect of armature reaction in DC machine and how the armature reaction is minimise?
Armature reaction is the interaction between the magnetic flux produced by armature current and that of the main magnetic field in an electric motor or generator.
When does electric current behave like a magnet?
Electric current behaves like a magnet when it flows through a wire, creating a magnetic field around the wire. This phenomenon is known as electromagnetism and is the basis for how electromagnets and electric motors work.
