Product test engineer Interview Questions

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Qualcomm
Product Test Engineer was asked...15 May 2014

Given an array of 10 numbers, all 0 or 1, write code to turn the 0's to -600 and the 1's to 600 without using any if/then or switch statements.

3 Answers

res[i] = {(arr[i] * 600) + (~arr[i] * -600)}

Alternatively, x = arr[i] << 31 return ( x ^ -600); //assuming x and -600 to be represented in 32 bit signed format and '^' as exor Less

result[i] = arr[i]*1200 - 600

Texas Instruments

Circuit analysis (find equivalent resistance, voltages, your basic circuitry stuff) Op amp stuff (ideal op amp, drawing an inverting opamp, deriving gain) Coding question (I believe it was about private variables) Stats question (draw a Gaussian curve and explain standard deviation and mean) LPF (draw an RC low pass filter and derive gain )

2 Answers

I was able to answer around 75-80 % of the questions. I knew my opamps, circuits, lpf, and somewhat remembered stats stuff (occasionally said I didnt know things), the coding question i admitted not knowing what they were talking about. It wasnt bad, just very intense, got an offer 2 days later Less

The key in these questions is to cover the fundamentals, and be ready for the back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Texas Instruments or ex-Texas Instruments Product Test Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews Less

Texas Instruments

Describe a project that you worked on

2 Answers

Dicussed the role I had within a smart home integration project

The key in these questions is to cover the fundamentals, and be ready for the back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Texas Instruments or ex-Texas Instruments Product Test Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews Less

Sasken

They ask many of my work and research experience

1 Answers

did they ask you question related to your resume and how long did interview process took? Less

NXP Semiconductors

Generic machine operation & example (even though does not really understand as manager not from this backgroud), generic reason for leaving, and what is expected salary. Technical manager ask related job technical details.

1 Answers

Answer per what is required. Hiring manager does not understand what was being conveyed. Answer technical manager about what is previous job position, and some technical details. Less

Texas Instruments

Describe a time your were in a team environment and the team failed to meet a task. What did you do? Was the problem resolved afterwards?

1 Answers

It's essential to demonstrate that you can really go deep... there are plenty of followup questions and (sometimes tangential) angles to explore. There's a lot of Product Test Engineer experts who've worked at Texas Instruments, who provide this sort of practice through mock interviews. There's a whole list of them curated on Prepfully. prepfully.com/practice-interviews Less

Texas Instruments

Design a low-pass filter. Design an op amp with gain of two. What is 101 (binary) in decimal.

1 Answers

Resistor (or inductor) in series with capacitor (output voltage). Non inverting op amp with Rf = Ro. 101 = 100 + 1 = 4 + 1 = 5. Less

Texas Instruments

Deriving transfer function for inverting op amp. Questions about Low pass filters and impedance. Parallel and series for conductors capacitors and resistors.

1 Answers

It's essential to demonstrate that you can really go deep... there are plenty of followup questions and (sometimes tangential) angles to explore. There's a lot of Product Test Engineer experts who've worked at Texas Instruments, who provide this sort of practice through mock interviews. There's a whole list of them curated on Prepfully. prepfully.com/practice-interviews Less

Texas Instruments

What project are you most proud of and why?

1 Answers

Use a technical project. Hopefully it aligns with TI. If not make sure it is technical Less

Qualcomm

Explain S-parameters.

1 Answers

S-Parameter: Scattering Parameter which is used in high frequency passive and active component characterization. Reflection co-efficient is the parameter used to get the S11, S22, S21, S12. S11, S22- Input/Out reflection co-efficient S21, S12- Forward transmission and reverse transmission co-efficient For Passive S21=S12 For Active S21 is the gain and S12 is the isolation Less

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