hey guys , can u please help me at these questions?

Q4. paper 2009 Paper 2

Q. Why there is sudden increase in the small reverse saturation current at the break down voltage?



Paper 2007 Q 4(b)

Q How you use a triode as a detector in radio wave receivers?



p2 2009 q 4b

draw the three common transistor circuits......... what does it mean?