
In practice two types of impulse voltages can occur (i) full wave and (ii) chopped impulse wave.If the lightning surge travels along the transmission line,it results in full wave impulse voltage reaching to transformer.Whereas if the surge voltage causes a flash over just before reaching to transformer it results in chopped impulse wave. The full…

There are thousand of tips and tricks are available that can be used to block porn websites in your computer but all these tricks are not fully secured and safe. People which are already familiar with these tricks can penetrate them and access porn websites easily in any system. So developers have launched some of anti porn software which…

Windows XP Windows XP support has ended Click on the image to View Larger One of the biggest software company Microsoft decided to end the support for the some of the version of windows operating system. Please look at the below: Support for Windows XP is ending on April 8, 2014. Support for Windows Vista…

The greater threat to computer is a computer virus,a program that causes a computer system to behave in unexpected and undesirable ways.Some signs of a virus include inexplicable loss of free memory,unusually long times for program loading or execution,changes in file or program size,print routines that stop working ,computers”freezing up”‘strange beeps or messages,computer reboot in the middle…

A portable room cooler is an electrical appliance used for cooling and ventilating a room of medium size.It is more effective than ordinary electric fans because it performs the added function of blowing out air which circulates through filter pads that contain water.This further cools the air which is then blown outwards. The working action…

Calculator Description A calculator is an electronic device used for performing mathematical calculations.A simple calculator works by depressing keys on a keyboard,whereby it is told to add,subtract,multiply,divide and clear the display.Complex calculators can perform many scientific calculations.It may be mechanical,electromechanical or electronic. The early forms of a calculator were the ‘abacus’ and then the ‘slide…

In the month of May 2012,the country’s peak power demand was estimated at 84.162 MU,but actual availability was only 77,888 MU,reflecting a shortfall of 6,274 MU or 7.5 percent. Earlier,in the month of April 2012 the country’s peak power demand was estimated at 78,947 MU,but actual availability was only 74,793 MU,reflecting a shortfall of 72,447…

Long wall mining is the most productive technology in the world,where one shearer is deployed in one mine for producing coal up to 1 million-3million tons per annum from a single face.The advantage of the system is that it has very low manpower requirement.It can work in very high gradient working and has the lowest…

The share of generation fueled by coal in the US has declined dramatically in recent months.Coal’s share of total power generation first fell below 40 percent in November last year and averaged 36 percent during the first quarter of 2012,compared with an average of almost 45 percent during the same period last year. Much of…

Tata Power Company Limited has signed a deal with BP alternative energy holdings to acquire the latter’s 51percent stake and preference shares in Tata BP Solar India Private Limited.Following the acquisition, Tata Power would own 100percent stake in Tata BP Solar.The former would have access to certain BP technologies till 2013 and an agreement  for…