Monthly Archives: March 2011

Ferrites

Ferrimagnetic materials commonly known as ferrites, can be generally represented by chemical formula XOFe2O3, where X stands for Mn, Co, Ni, Cu, Mg, Zn, Cd etc. If X is Fe, then compound is Fe3O4. X-ray crystallography proves that ferrites are … Continue reading

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Applications of ferrites

Ferrites have following applications: Ferrites have importance in engineering and technology because they possess spontaneous magnetic moment below the Curie temperature just as iron, cobalt, nickel. Due to vey low eddy current losses, ferrites are used as a core of … Continue reading

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Hard magnetic materials

Hard magnetic materials are those which have high coercivity, high retentivity and low loss in magnetisation due to mechanical treatment and no effect of temperature. These materials are called hard because these are difficult to magnetise and demagnetise. The higher … Continue reading

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AON hewitt technical interview questions

Hello Guys, My AON hewitt technical interview went as follows: 1. Can u make a program to display prime numbers?: Yes sir 2. Can u make a program to generate Fibonacci series? Yes sir 3. Can you make a program … Continue reading

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Induced anisotropy

In case of polycrystalline solids, the various crystals in a polycrystals are randomly oriented, so that properties are same in all directions. However if specific treatment such as cold rolling is given to certain polycrystalline substances, then magnetic properties become … Continue reading

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Magnetic Anisotropy

Magnetic anisotropy is that property due to which ferromagnets tend to magnetize along certain crystallographic axes, called directions of easy magnetization. Example: In certain single crystals such as iron. The magnetic properties depend upon the direction in which these are … Continue reading

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Applications of magnetostriction

Magnetostriction has following applications: this effect is used in high frequency oscillators and generators of super sound. For under water projectors and sound detectors Reference: This article is referred from my book “electrical engineering materials” having ISBN 978-81-272-5069-0

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villari effect

Magnetostriction is a reversible effect because change in magnetsation can be produced by applying stress on the material. This effect is called Villari effect. Reference: This article is referred from my book “electrical engineering materials” having ISBN 978-81-272-5069-0

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Magnetostriction

When a ferromagnetic material is magnetised, its length either expands or contracts in the direction of the magnetisation. This effect is called magnetostriction or Joule effect. In other words, magnetostriction refers to the changes in the dimensions of a ferromagnetic … Continue reading

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HCL infosystems interview

Dear friends, As you are preparing for the placement in a reputed company like HCL then Let us discuss overview of HCL infosystems as it may be beneficial for you in the HCL interview. HCL infosystem is part of HCL … Continue reading

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