
Optical fibres can be used for measurement of temperature.This is because the temperature induces changes in refractive index of the fibre.In fibre the refractive index is a function of  both composition and temperature and it changes at different rates in response to a temperature changes.A higher temperature change cause the critical angle of the fibre to change…

A firewall is a system that enforces an access control policey between two networks-such as your private LAN & the unsafe,public internet.The firewall determines which inside service can be accessed from the outside & vice-versa.The actual means by which this is accomplished varies widely,but in principal,the firewall can be thought of as a pair of mechanism:one to block traffic &…

Bharat Coking Coal Limited is a subsidiary of Coal India Limited,Government of India Enterprise,mainly situated in the state of Jharkhand & partly in West Bengal.It is the largest coal company operating in the Jharia coalfields & is the prime source of coking coal in the country. The management of the coking coal mines in Jharia…

The world’s richest woman Australian mining tycoon Gina Rinehart,urged those”jealous” of the wealthy to “spend less time drinking”in a piece blasted as “insulting”by Canberra on Thursday.Mrs Rinehart,whose family iron ore prospecting fortune of A$29.2 billion(S$37.9 billion) also make her Australia’s wealthiest person,hit out at those envious of the rich.”There is no monopoly on becoming a…

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…

The zero-power factor characteristic (ZPFC) of an alternator is a curve of the armature terminal voltage per phase plotted against the field current obtained by the operating the machine with constant rated armature current at synchronous speed and zero lagging power factor.The ZPFC is some times called potier characteristic after its originator. For maintaining very…

In an a.c. machine,any flux set up by the load current which does not contribute to the useful flux of the machine is a leakage flux.The effect of the leakage flux is set up a self-induced emf in the armature windings. The leakage fluxes may be classified as follows: 1.Slot leakage 2.Tooth head leakage 3.Coil-end…

CAD has the following advantage over traditional method of design- (i)Â Computer aided design (CAD) is faster and more accurate results than conventional methods. (ii)Â Developing the design of component and associated drafting is a very easy task with CAD. (iii)Â Manipulation of various dimensions,attributes and distance of drawing elements,is very easy.This make CAD the most useful designing…

From 2013, the GATE score will be computed by a new formula. (Click on the above formula to see it in a larger size). This formula is different from the one used earlier. After the declaration of the results, a GATE Scorecard will be issued to all the candidates of a paper whose marks are…

Entrance exam for the M.tech/ M.E. GATE 2013 have been scheduled by the commitee of the IIT institutions. IIT Bombay will organize the GATE exam 2013. The schedule and the criteria details for the exam will be given as below: Graduate Aptitude Test in Engineering Organizing Institute: Indian Institute of Technology Bombay Dates of Examination…