Electronics interview questions
500 questions with model answers, in four levels. Start with Basic, check yourself honestly, then move up.
Basic questions
- Semiconductor Physics (13)
- Diodes & Rectifiers (13)
- BJT (13)
- FET & MOSFET (13)
- Amplifiers & Feedback (12)
- Op-Amps (13)
- Oscillators & Waveform Generators (12)
- Combinational Logic (13)
- Sequential Logic (12)
- Power Supplies & Regulators (12)
- Filters & Passive Networks (12)
- Practical Electronics, PCB & Measurement (12)
Intermediate questions
- Semiconductor Physics (13)
- Diodes & Rectifiers (13)
- BJT (13)
- FET & MOSFET (13)
- Amplifiers & Feedback (12)
- Op-Amps (13)
- Oscillators & Waveform Generators (12)
- Combinational Logic (13)
- Sequential Logic (12)
- Power Supplies & Regulators (12)
- Filters & Passive Networks (12)
- Practical Electronics, PCB & Measurement (12)
Advanced questions
- Semiconductor Physics (10)
- Diodes & Rectifiers (10)
- BJT (11)
- FET & MOSFET (11)
- Amplifiers & Feedback (11)
- Op-Amps (11)
- Oscillators & Waveform Generators (10)
- Combinational Logic (10)
- Sequential Logic (10)
- Power Supplies & Regulators (11)
- Filters & Passive Networks (10)
- Practical Electronics, PCB & Measurement (10)
Tricky questions
- Semiconductor Physics (6)
- Diodes & Rectifiers (7)
- BJT (6)
- FET & MOSFET (6)
- Amplifiers & Feedback (6)
- Op-Amps (7)
- Oscillators & Waveform Generators (6)
- Combinational Logic (6)
- Sequential Logic (6)
- Power Supplies & Regulators (6)
- Filters & Passive Networks (7)
- Practical Electronics, PCB & Measurement (6)
Sample questions
- What is a semiconductor?
- What is a clamper circuit?
- What is R_DS(on)?
- What is input bias current?
- What is two's complement?
- What is current limiting in a power supply?
- Why does the conductivity of an intrinsic semiconductor increase with temperature?
- What is a tunnel diode?
- What is a logic-level MOSFET?
- How is an op-amp biased on a single supply for AC signals?
- How is overflow detected in two's complement addition?
- What is soft-start?
- Calculate the resistivity of intrinsic silicon at 300 K (nᵢ = 1.5 × 10¹⁰ cm⁻³, μₙ = 1350, μₚ = 480 cm²/V·s).
- How accurate is a simple BJT current mirror, and how is it improved?
- How is the output stage of a Class D audio amplifier filtered?
- Estimate the worst-case delay of a 32-bit ripple-carry adder with 1 ns carry delay per stage.
- How is the control loop of an SMPS compensated?
- "Holes are positive particles that physically travel through the crystal." True?
- "Negative feedback always makes an amplifier stable." True?
- "Latches and flip-flops can be swapped freely." True?