Electrical4U 
What Does an Economizer Do in a Boiler A boiler economizer (also called an economizer) is a heat exchanger in the flue-gas path. It takes remaining enthalpy from gas that has already left the evaporator and puts that heat into the incoming feedwater. The steam boiler’s furnace then burns less fuel to raise the same … Read more
“Maintenance” as the name suggests it is the action necessary for retaining or restoring a piece of equipment or machine to the specified operable condition to achieve its maximum useful life. Induction motor maintenance is the work that keeps a motor in a specified operable condition for its useful life. Maintenance of these machines falls … Read more
A Shunt Reactor is used to compensate the capacitive reactive power of a long transmission line. The constructional features of a shunt reactor may vary from manufacturer to manufacturer, but the basics of construction are more or less the same. Core of Shunt Reactor Shunt reactors typically use a gapped core, built from Cold Rolled … Read more
There is always a significant charging current flowing from conductor to earth in underground high voltage and medium voltage power network. This is because of dielectric insulation between earth and conductor in the underground cables. During an earth fault in any phase, in a 3 phase such system, the charging current of the system ideally … Read more
Superconductivity was discovered by Dutch physicist Heike Kamerlingh Onnes in 1911 in Leiden. He won the Nobel Prize in Physics in 1913 for his low-temperature research. Some materials, when cooled below a certain temperature, lose all electrical resistance and exhibit infinite conductivity. The property / phenomenon of infinite conductivity in materials is called superconductivity. The … Read more
Negative Feedback in Op Amp We obtain Negative feedback in an op amp by connecting output terminal of an op amp to its inverting input terminal through a suitable resistance as shown below.The gain of an op amp with negative feedback is called closed loop gain. Closed Loop Gain of Op Amp When we connect … Read more
An electric circuit is based on three concepts: nodes, branches and loops. An electric network is a combination of interconnected circuit elements and may not always provide a closed path for current. However, an electrical circuit includes one or more networks that create closed paths for electric current to flow. When these networks interconnect to … Read more
The steam turbine is a favourite prime mover in a steam power generating plants. The steam turbine may be of capacity from 5 megawatts 2000 megawatt. A steam turbine converts high-pressure steam into rotating shaft work, which a generator then turns into electricity. The advantages of a steam turbine over a diesel engine are as … Read more
Causes of Acidity in Insulating Oil The insulating oil in a transformer may occasionally come into contact with air, for example while opening any blanking or through leaks in the oil tanks or associated pipelines. Because of this contact, the oxidation reaction takes place in the transformer oil, accelerated further by temperature and by the … Read more
A digital multimeter is defined as a device used to measure electrical parameters such as voltage, current and resistance. The term “digital” refers to its digital display, while “multimeter” reflects its ability to measure several parameters. A typical digital multimeter includes a selection switch, display, ports and probes.Insert the probes into the appropriate ports and … Read more