Zone I (the rapidly decreasing part of the curve), referred to as the Burn-in period or infant mortality stage, is characterized by failures due to manufacturing defects. Zone II is the useful life stage and is characterized by a constant failure rate due to random failures. Zone III, is termed the Wearout period and is characterized by an increasing failure rate as a result of equipment aging and deterioration. Because modern electronic equipment is largely made up of semiconductor devices that have no real short term wear out mechanism, the existence of a Zone III for electronic systems is sort of a gray area . For most electronic components, Zone III is relatively flat. What is important for designers to realize is how electrical systems fail. In subsequent sections, the more common causes for electronic system failure will be outlined along with some common methods of protection. Afterwards, various classes of reliability prediction models will be presented. There are numerous models, most of which fall under the given five classifications.
And the points on your cards shouldn't match your paper; instead of regurgitating information, discuss why the key points of your paper are important or the different points of view on this topic within the field.
do u mean switching the mosfet with switch or variac? no i dont have any of those, i just built a transformer with 32vac and 25amps o/p. o/p of transformer is connected to a bridge rectifier(35amps) with 4*80v 10000uf caps then straight to the terminals of the circuit. i exactly used the same components that u mentioned, now, i m using 4uf 270v caps instead c1 that u mentioned, thats it. i didnt try with 4uf 270v caps i ll tell ya after my experiment.
i have come to terms with the fact that there is an enormous proportion of subject to be assimilated, therefore I want to take up a research oriented course in my career....
publishes original papers, review papers, technical reports, and case studies. Special Issues devoted to important topics in power electronics will occasionally be published.
or equivalent in Mechanical / Electrical / Instrumentation selected through common entrance test (CET) for which advertisement appears in leading national newspapers / Employment News in the month of March/April.