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It seems you've uploaded a midterm exam question paper from Southeast University for the course EEE215: Electronics I. I can help you with solving these questions or explaining the concepts involved.

Here's an overview of the questions:

### Question 1:
1. **(a)** Explain the working of a half-wave voltage doubler with a diagram.
   - Conceptual question asking for an explanation and diagram of a half-wave voltage doubler circuit.
   
2. **(b)** Sketch \( v_o \) and \( i_R \) for the given network (includes a silicon diode and resistors).
   - Involves sketching the output voltage and current for the given circuit diagram.

3. **(c)** Discuss the center-tap and bridge rectifier circuits with identical load resistances and transformer ratios, calculate DC output voltage and peak inverse voltage (PIV).

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### Question 2:
1. **(a)** Explain the formation of a PN junction.
   - Basic question regarding semiconductor physics.

2. **(b)** Calculate resistance and efficiency for a bridge rectifier circuit.
   - Involves calculations for a bridge rectifier circuit based on the given parameters.

3. **(c)** Sketch \( v_o \) for a given circuit and find the DC voltage.
   - Requires sketching the waveform and calculating DC output for the diode network.

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Would you like assistance with specific problems or an explanation of one of the concepts? Let me know which one you'd like to start with!

Here are five relative questions to guide further learning:
1. How does a half-wave voltage doubler compare to a full-wave voltage doubler in efficiency?
2. What is the significance of Peak Inverse Voltage (PIV) in diode rectifier circuits?
3. How does the center-tap rectifier differ from a bridge rectifier in terms of performance?
4. What role does doping play in the formation of a PN junction?
5. How do transformer turns ratios affect the output voltage in rectifier circuits?

### Tip:
When analyzing rectifier circuits, always check the behavior of diodes during positive and negative half cycles of the input waveform to determine the output voltage.

Explain the working of a half-wave voltage-doubler with suitable diagram. Sketch the output voltage vo and current iR for the given network. Discuss center-tap and bridge rectifier circuits, including DC output voltage and peak inverse voltage (PIV). Explain the formation of a PN junction and calculate resistance and efficiency for a bridge rectifier circuit.

Learn the principles of a half-wave voltage-doubler with a diagram, including the sketching of output voltage and current. Analyze center-tap and bridge rectifier circuits for DC output and PIV, and understand PN junction formation with detailed calculations for rectifier resistance and efficiency.

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