Q3. A. What are the characteristics of PN junction diode? Point out its specifications. Also point out the significance of dynamic and static resistances.
B. Discuss different methods of speed control of a D.C. series motor by adjusting field ampere turns.
Q4. Explain the meaning of ‘P’ and ‘N’ types semi-conductor materials and give a brief description of the mechanism by which current passes through them.
Q5. With the aid of a block diagram, briefly describe the effect which negative voltage feedback has on an amplifier and state the advantages resulting from the use of negative feedback. (16)
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