ELECTRICAL ENGINEERING

Transistor working In this article we will discuss about the transistor working . we discuss about types of transistor and their working. we learn about biasing of transistor.   Transistor working A transistor is a semiconductor device. Which is used to amplify and switch electronic signals and electrical power? It accepts small electrical signal either in the form of current or voltages at the input and then amplifies and provide a large amplified signal. The name transistor is derived from transfer resistor. This tem best describes the operation of a transistor-transfer of an input signal current from a low resistance circuit to a high resistance circuit. Bipolar junction transistor working (BJT) It is a three terminal device made up of silicon or germanium. The word bipolar indicates that both electron transport and hole transport take place in such a device. Construction of (BJT) transistor working This transistor (working) is formed by combination of two junct

Transformer oil testing In this article we will discuss about the transformer oil testing and maintenance  of transformer. here we will discuss in detail about transformer oil testing. Transformer oil testing conservators are so designed that the lower part acts as a sump in which impurities and sludge may collect. A valve is fitted at the lowest portion of the conservator for draining and sampling . the inside of the conservator  should be cleaned periodically. Oil indicator glass should be kept clean so that oil level is clearly visible . Broken indicate glass should be replaced immediately. when conservator is taken for maintenance magnetic oil level indicator mechanism  should also be cleaned  and inspected for operation. float should be checked to see that there is no oil in the float. Transformer oil testing and maintance of transformer Silica gel breather Breather should be inspected frequently especially in a situation where temperature and humidity changes are conside