Related Questions
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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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The force between two magnetic poles is _____ the relative permeability of the medium.
A. directly proportional to
C. inversely proportional to
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An alloy of 40 percent iron and 60 percent nickel.
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Which of the following materials has the highest dielectric strength?
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The science of adapting electronics to aerospace flight.
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What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
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The phenomenon by which a subtracts pieces of iron
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Back emf refers to the
A. Current equal to the applied emf
C. Current opposing the applied emf
D. Voltage opposing the applied emf
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How much is the flux in Weber in the above problem?
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Cobalt is an example of a ______ material.
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An alloy of 22 percent iron and 78 per cent nickel.
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What is the unit of magnetomotive force?
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The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing it
C. Magnetic susceptibility
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The ability of a material to conduct magnetic flux through it.
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When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
A. Statically induced emf
D. Dynamically induced emf
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If the number of valence electrons of an atom is less than 4a then the substance is probably
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A law that states that the current in a thermionic diode varies directly with the three- halves power of anode voltage and inversely with the square of the distance between the electrodesa provided operating conditions are such that the current is limited only by the space charge.
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One of the solid structures in which the position of the atoms or ions are predetermined
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If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 ?a then its resistivity is
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One of the common application of an air- cored choke.
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The relative permeability of a magnetic material is 10^5. What is its permeability?
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The force which set ups or tends to set up magnetic flux in a magnetic circuit
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A substance that attracts pieces iron
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What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?
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A t/m is a unit of
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The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called
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The quantity 10^6 maxwells is equivalent to one
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One ampere- turn is equivalent to _____ gilberts
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A one cubic cm of copper has how many free electrons at room temperature?
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A test charge means a charge of