Define what is the importance of valence shell and valence electrons?
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can any one send me previous ntpc exam papers at garima.12g@gmail.com?
sir i am completed B.E in 2006 i wrote RRb Section Engineer Exams two times .how to prepare and how is ask previous question paper some previous question paper send through mail id
Define modulation.
how to calculate percentage impedance
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Define digital system?
why rs232 is used in uart when there are many rs devices like rs449 etc . what is the main advantage in using rs232
Name some of the voltage driven (voltage controlled) devices?
why we use zener diode in switching action
What is hole theory
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plz send me any one gate papers
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