1. Explain the operation of the circuit below. Include a description of its output waveform, including its amplitude and period. -12 V 470 Ωξ +12 V 100 k2 0.1 µF 1 k2 1 kQ 10 V B *5.1 V Vout

2. Describe what you understand by overcurrents and indicate the protection devices that can be used for this purpose. What do you know about selectivity and parity between protections? Justify your answer.

1-What phrase is used when a substitution is permitted for a specific item? 2-The specifications state that all work shall be done... 3-What phrase is used when a substitution is permitted for a specific item? 4-What is the purpose of an electrical symbol? 5. Where are notations found?

Show that Circuit (II) is simplified version of Circuit (I). Hint: Use reference table.