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discuss description of insulating materials on the basis of physical and chemical structureinsulating materials on the basis of their physical and
what are the cautions to be taken before starting work on electrical installationsans before starting any electrical works on installations
explain brass and bronzebrass-it is an alloy of copper and zinc with 60 percent copper and 40 percent zinc its electrical resistivity of brass is 70
what is the effect of overheating on the life of an electric insulatoran insulator is designed to withstand amount of heat however when an insulator
explain resistivityresistivity resistance r of a wire containing cross-sectional area a and length l maintain the relationship - r alpha l and r
discuss the advantages and disadvantages of aluminium as compared to copper as a conductor of electricityadvantagesaluminium as a conductor of
explain properties and application of copperproperties1 cooper is reddish brown in color2 cooper is malleable and ductile and can be forged cast
explain properties and application of aluminiumproperties of aluminium1 pure aluminium in colour is silver white2 aluminium is a ductile metal and
why earthing is required for any electrical equipments domestic installation and service building etc for tl coaches what is the minimum ir value
explain factors that change the resistivity of conducting materialstemperature- electrical resistance of most metals rises with increase of
explain the principle of a thermocouple give two examples of some common thermocouplesthermocouples they are used for the measurement of temperature
name the materials used in case of bimetals and give reasons bimetals alloy of nickel and iron along with low value of coefficient of thermal
name the materials used in case of solder and give reasons solder for soft solders tin lead in 50-50 ratio alloy and for hard solders copper- zinc
name the materials used in case of fuses also give reasons fuses for rewirable fuses copper-tin and lead-tin alloy is used for hrc and cartridge
what is the effect of temperature on conductivity of semiconductorelectrical conductivity of semiconductor changes appreciably along with temperature
give the properties and application of asbesto asbestos it is inorganic fibrous material two kinds of asbestos are availablechrysotile asbestos this
give the properties and application of glassglass - it is an inorganic material made by the fusion of various metallic oxides the properties of glass
give the properties and application of bronzebronze it is alloy of copper and tin this alloy is very brittle and hard its corrosion resistance is
give the properties and application of brass brass- it is an alloy of copper and zinc with 60 percent copper and 40 percent zinc its electrical
the covers of electrical machines are made ofa soft magnetic materials b hard magnetic materialsc super
in n type semi conductor added impurity isa
property of material which allows it to be drawn out into wires isa
name the various magnetically hard alloysseveral of the magnetically hard materials are rare earth carbon steel cobalt tungsten steel alnico hard
what are hard magnetic materialshard magnetic materials- they have a slowly rising magnetization curve along with large hysteresis loop area and
distinguish between ferromagnetic and diamagnetic materials mentioning at least one example of eachferromagnetic materials these are materials