3. a) Write short notes on
i) Ferrite cores
ii) Powdered iron cores (5)
b) Explain different types ofheat transfer methods. (4)

Part B

4. What are ground loops? What are the problems associated with ground loops in
converter circuits? Explain the methods to overcome the ground loop noise. (9)

5. Explain the working of the MOSFET driver circuit with totem pole connection, using

relevant diagrams. (9)
6. a) Explain the necessity of driver circuit in an inverter. (5)

b) Draw and explain any two commonly used snubber circuits. (4)

Part C
7. Explain over current protection using de-saturation scheme (12)
8. Explain conductive and radiated EMI. Elaborate on the methods to minimize EMI.
(12)

9. a) Explain over temperature protection used with IPMs. (6)

b) Explain common mode filters to suppress electromagnetic interference. (6)