Oxide breakdown voltage

Please see the attached file for full problem description.

Cap / inductor questions

1) If caps block dc what is the purpose of a cap in a dc circuit? 2) What does an inductor do in a dc circuit? 3)What is the point of having a cap to ground in a dc circuit? 4)What is the purpose of a null modem? 5) How do you design a circuit to use caps or inductors in a dc circuit? An ac circuit? 6) What is a biasing cap?

Full Wave Center Tap Bridge Rectifier - what is the v drop?

In attached image, How is VDC across the load resistor found? The practice test has an answer of 28.24 ignoring the ripple voltage. VDC across the resister is Vout right? So, Vsecondary - the voltage drop in the diode = Vout = VDC So, if the secondary winding has 40voltage - .7V drop in the top resistier, that's 39.3V. How is 28.24 derived? Thank you. Also, when asked for the power dissipated in the transistor, exactly which voltage and current is used in the calculation? Is it Ve and ie? What is a varacter operated in the reverse saturation region? Is seems like the depletion region width is being controlled by a variable forward bias - why is this wrong? Thank you. ... click for more

BJT AC/DC loadline analysis

The problem says to Find Icq, Vceq; plot dc and ac loadlines, calculate the small signal voltage gain, then determine the input and output resistances (Rib and Ro). Beta=120. Va=infinity.

PNP BJT AC/DC circuit analy

For the circuit/problem in the picture: When doing KVL to find ib, do I add .7 or subtract .7 because it is a pnp transistor? What is the small signal equivalent circuit? Thanks.