Hardware Engineering Intern Interview Questions | Glassdoor

# Hardware Engineering Intern Interview Questions

22

Hardware engineering intern interview questions shared by candidates

## Top Interview Questions

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### Hardware Engineer Intern at Microsoft was asked...

Dec 21, 2011
 If you increase the width of a PCB trace, does it decrease or increase the trace impedance?3 AnswersAs you increase trace width, impedance is lowered.The question is a little tricky (not really tho). The impedance of a straight line is described by Z=R+jX, where R is the resistance and X is the reactance. As the width of the trace is increased, R decreases. If we assume that there is no inductance, then the impedance will go down, as X=1/(jwC), and C=W*L*C0. However, in a very inductive space (like trace is curly and goes around itself a lot), then X = jwL, thus increasing the complex part of the impedance. I would go with the decreasing impedance, as on the PCBs resistance is the dominant term.If you increase the width of the pcb trace then it will help decreasing the resistance of the PCB trace. I give you a simple analogy if for example we consider the inductance as the negligible amount then, ( R=c (L/A)) where c is resistivity . And we are increasing the Area of cross section that is A. Then that is inversely proportional to the resistance and hence it decreases the impedance.

### Hardware Engineer Intern at Microsoft was asked...

Dec 21, 2011
 What factors control the impedance of a trace?2 AnswersTrace width, copper thickness, and dielectric widthwidth and thickness of the copper signal trace, thickness of the core or prepreg material on either side of the copper trace and dielectric constant of the core and prepreg material

### Hardware Engineer I Intern at National Instruments was asked...

Nov 16, 2015
 A time you had a bug and how you fixed it.1 AnswerI talked about a program I wrote and how the recursion wasn't correctly operating and how I de bugged it.

Jul 9, 2010

May 13, 2012

### Hardware Engineer Intern at Microsoft was asked...

Dec 21, 2011
 What happens to a signal integrity as you increase length and when there is return current?2 AnswersStairways in signals.It is better to keep the return path as short as possible, since it will form a loop antenna and will give EMI/EMC problems based on the loop length matching with operating frequency.

### Hardware Engineer I Intern at National Instruments was asked...

Feb 7, 2012
 Design an asynchronous state machine that has three inputs and one output.1 AnswerI can't recall the specifics of the machine design, but it was somewhat tricky. There were race conditions that arose under various assignment techniques that I noticed as I worked through the problem. Definitely brush up on these topics before interviewing with them.

### Test Hardware Engineering Intern at Skyworks Solutions was asked...

Feb 20, 2014
 Give me three reasons why I should hire you.2 AnswersThis was unexpected because it was the very first question I received from the hiring manager.I am passionate about what I do "testing" I know how to test hardware I can learn quickly new techniques

### Hardware Engineer Intern at Intel Corporation was asked...

May 10, 2012
 What do you expect to see at the output when you connect 8 more inverters to an inverter? 1 Answernot + (8* gate delay)+(8*track propogation delays)

### Hardware Engineer Intern at Intel Corporation was asked...

May 10, 2012
 Why do you need to calculate gain and phase? 1 AnswerGain is a ratio of output voltage/input voltage, Phase is a frequency term. Both need to looked to verify the component/system behavior.
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