Question 1: What is Insulation resistance? Answer: Insulation resistance is the property, by the virtue of which, a material resists flow of electrical current. It should be high as possible Question 2: * Describe the physical properties and uses Soft and hard magnetic materials. Answer: Soft magnetic materials –They have small enclosed area of hysteresis loop, high permeability, high saturation value, low eddy current losses which is achieved by using laminated cores, less residual magnetism. Soft magnetic materials retain their magnetism as long as they are energised by an external magnetic field; Example: Alpha iron, super permalloy (Ni-Fe-Mo), silicon ferrite. Soft magnetic materials are used for the construction of cores for electrical machines, transformers, electromagnets reactors and cores of audio frequency couplings and matching transformers in telecommunication. Question 3: * What is called The ability of a material to absorb energy in the plastic ran...
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