Interview Questions

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VVDN - Interview Questions I

1st round (Written Test consisted of 25 questions): • 10-12 questions from digital electronics (multiplexers, logic gates, flip flops) • 13-15 questions from analog electronics (operational amplifiers, clippers, clampers, transients, transistors, KVL, KCL) 2nd round (Technical interview): Basic electronics 1. Introduce yourself. 2. What is operational amplifier? 3. Questions related to transformers. 4. What are step up and step down transformer? 5. Explain the working of pn diode. 6. What are thyristers, SCRs, TRIAC and DIAC? 7. Difference between TRIAC and pn diode. 8. What is AC and DC? 9. Ring counters and twisted ring counters. 10. What are flip flops? 11. What are multiplexers? Give some applications of multiplexers. 12. What is zener diode? 13. Draw and explain transfer curve of zener diode. 14. What is the binary representation of -7? 15. What is JFET? Explain the working of JFET. 16. What are decoders? 3rd round (Technical interview): 1. Difference between stack and stack pointer. 2. Implement OR gate using NOR gate. 3. Interrupts in 8051. 4. When an interrupt is fired then internally what operation is taking place? 5. Suppose there are 4 address locations reserved for stack then when interrupts are fired, is there any imitation? Is yes, then what the limitations are. 6. Current Amplifier. 7. Draw a circuit to glow the LED. 8. Difference between inductors and capacitors. 9. Questions from ADC. 10. 12-bit resolution ADC has 4V reference voltage. What will be the digital O/P for the analog I/P 1V? 11. Using a transistor, draw a circuit to glow a LED. 12. Circuit diagram of power supply circuit and the O/P waveforms at each stage. 13. Number of address lines used for 1K memory. 14. Difference between BJT and JFET. 15. What is zener breakdown?

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