What are the advantages of igbt over bjt, mosfet?

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i m selected in AAI JE. my interview is on 25 sept. 2010. i don't hv any idea abt aai interview. can anyone help me, i want to know interview qus of aai. so pls help me... my e-mail id -- mailmanish_kumar@yahoo.co.in

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What is the wave equation for the sound waves encountered in smart cell phones, specifically android?

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What is latching current in scr?

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why dose response of a phototransistor depent upon the wave length of the incident light?

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What is the use of scr?

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why we use low and high radio band in m/w link at both end

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what is standared for leakage voltage(not current)in electronics industries who are manufacturare of vcd, dvd and controll cards.

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Define biasing?

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Define why half-wave rectifiers are generally not used in dc power supply?

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Explain what are the main advantages of synchronous circuit?

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what is a random variable?

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