
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…

IEEE Standards Association,a globally recognized standards setting body under the Institute of Electrical and Electronics Engineers(IEEE),has launched the IEEE 1547.4TM guide for design,operation and integration of distributed resource (DR) island systems with electric power systems.The guide is the first in-depth resource providing alternative approaches and best practices for deployment of DR island systems or micro-grids in India. Micro-grids have complex infrastructures and the…

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…

India’s coal production during the first three months(April-June) of 2011-12 stood at 118.91 mt,lower than the target of 124.91 mt ,but almost flat as compared to 118.73 mt produced in the corresponding period of 2010-11,according to information available from the Coal Ministry. During the first quarter of 2011-12,Coal India Ltd(CIL) subsidiaries had produced 96.31 mt,singareni…

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…