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The first three interviews had questions from Analog, Digital electronics along with firmware and / or Machine language based questions. Some of the topics on which there were questions. 1. Switched capacitors 2. Astable multivibrators. 3. OP AMP circuits - OPAMP behaviour in saturation stc. 4. Questions on Set up and Hold times. 5. Questions on T Flipflops used in some parity check circuit. 6. Questions on interrupts, subroutines and stuff related to programming. All the questions were simple and tested the understanding of concepts. It would be more than sufficient to go through the GATE examination questions on Analog, Digital, Networks, Signal and System topics.