Related Questions
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A principle that states that only two electrons with different spins are allowed to exist in a given orbit
B. Pauli exclusion principle
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The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as
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The temperature coefficient of resistance of insulators is
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Hysteresis loss can be reduced by one of the following.
A. Increasing mmf of the circuit
B. Using material narrow hysteresis loop
C. Using ferromagnetic core
D. Laminating the magnetic circuit
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4
The B-H curve of ________ is not a straight line.
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In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to
A. permit mechanical clearance
B. increase flux density in air gap
C. decrease the reluctance of magnetic path
D. complete the magnetic path
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A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.
A. Kirchhoff's circuital law
B. Maxwell's circuital law
C. Ampere's circuital law
D. Coulomb's circuital law
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Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
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Which of the following has the least number of valence electrons?
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Electronic current in a wire is the flow of ____________ electrons.
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Electrons at the outer shell are called
C. Semiconductor electrons
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The physical motion resulting from the forces of magnetic fields is called
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What is the other name for dielectric strength?
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The dielectric constant of most materials lies between
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How is mutual inductance between two coils decreased?
A. By using a common core
B. By moving the coils closer
C. By moving the coils apart
D. By increasing the number of turns of either coil
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A good conductor has how many valence electrons?
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What is the SI unit of reluctance?
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The lagging effect between flux density of the material and the magne
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The force acting on a unit n- pole placed at that point is called
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic field intensity
D. Intensity magnetization
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The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
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The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
C. Either oppose or aid the change
D. Neither oppose nor aid the change
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If the magnetic material is located within a coil through which alternating current (60 Hz frequency) flowsa then __________ hysteresis loops will be formed
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The customary energy unit in atomic and nuclear physics is
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Which of the following is a natural magnet?
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Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is
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One weber of flux is equal to _______ magnetic lines of force.
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Which of the following is a paramagnetic material?
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A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.
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What is the main advantage of temporary magnets?
A. The magnetic flux can be changed.
B. Hysteresis can be decreased.
C. Magnetic materials can be used.
D. Abundance of ferromagnetic material that can be temporarily magnetized.
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As the magnetic intensity decreasesa the relative permeability of a magnetic material