Answer / saurabh

Nichrome has high resistivity than tungstan,bt tungstan has high melting point than nichrome...that's why tungstan is used as filament of incandescent lamp.

Answer / nagesh.patwari

Pure tungsten has some amazing properties including the highest melting point (3695 K), lowest vapor pressure, and greatest tensile strength out of all the metals.Because of these properties it is the most commonly used material for light bulb filaments. It can reach high temperature before melting and therefore emit a brighter light than nichrome can. Nichrome on the other hand, although it has a pretty high melting point (1673 K) it is not as high as tungsten, but it is often used for heating devices, such as a blowdryer. An electric current can heat the filament around 2000-3300 K, which stays below the melting point of tungsten but above that of nichrome.

please send me RRB electrical engineer previous year questions for Sr. Section Engineer

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