2024-03-30 Electrical : Interview Question Discussion

Owned by Daniel Puratich
Last updated: 2024-04-11
2 min read

Please note these interview questions were purely for this fun session and have nothing to do with Co-op Electrical Interviews. Those questions will be completely different and hidden in a private confluence page.

This is @Daniel Puratich Hosting a session to discuss some interview questions fun!

Pre-prepped Questions:

  • Differences between types of diodes?

    • we coverred this

  • FET vs BJT differences?

    • we coverred this

  • If you have a fixed current through a resistor, how would you change the resistance value to increase the power dissipated in the resistor?

    • we coverred this

  • What circuit would you implement to measure voltage of a 6S LiPo battery voltage from a microcontroller?

    • we coverred this

  • What is the output voltage of a voltage divider?

    • coverred

  • Draw a unity gain op amp circuit?

    • How would you compensate for input bias current if your input source is high impedance?

    • didnt get to this and any of the other pre prepped ones

  • Draw an inverting op amp circuit?

    • What’s the input impedance?

  • How would you use an op amp to convert an arbitrary waveform from -10V to +10V for a microcontroller ‘s ADC to sample assuming the microcontroller’s ADC range is 0 to 3.3V?(and the board doesn’t have any negative voltage rails)

  • What’s the differences between a ceramic and electrolytic capacitor?

    • Where would you use each of them?

  • Purpose of decoupling capacitors

  • Difference between thermocouple, thermistor, and digital IC temp sensing methods?

  • Differences between SPI & I2C?

    • Open Drain vs Push Pull? Pros and Cons

  • How would you use a micro to turn on an LED?

  • Buck converter CCM vs DCM operating modes?

  • LDO vs Buck for a specific application?

  • implications of buck switching frequency

  • purpose of flyback diodes?

  • What is a kelvin sense connection? When do you use it?

  • What is oscilloscope bandwidth?

  • Probe 10x vs 1x mode?

Meeting Notes on Content Coverred:

  • If you have a fixed current through a resistor, how would you change the resistance value to increase the power dissipated in the resistor?

    • v=ir, p=iv

  • What circuit would you implement to measure voltage of a 6S LiPo battery voltage from a microcontroller?

    • covered res divider formula, tvs and diode convo, low pass cap

    • input bias current, power dissipation

  • Nolan Seat Heater Question

    • how to drive a 12V seat header and contorl it from a microcontroller

    • FETs method, RLC damping, pullups/pulldowns

    • HSDs

  • how to sense a bunch of thermocouples

    • analog muxes

    • thermocouples vs thermistor