System Test Engineer Interview Questions


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Senior Systems Test Engineer was asked...June 7, 2010

There is a body of water that starts with 1 square unit, and doubles in size every day (2 units after 2 days, 4 units after 4 days). It takes 100 days to fill up. How many days would it take to fill if you started with 2 square units?

6 Answers

100 - 1 = 99 days

Starting with 2 square units at time t=0 is like 1 square unit at t = 1. [this logic is the key to answering the question]. Now let's do the first few cases. t = 0: size = 1+1 = 2 t = 1: size = 2(1+1) = 2+2 = 4 = f(2) in the 1 unit case. Pretty easy to see it only requires 1 time period less from here. The OP was right. Less

This question is phrased incorrectly. I think you meant "4 units after 3 days". Which makes your answer wrong as well. This is not helpful at all. Less

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All about resume, why SCFDMA in uplink, PHFICH channel frequencies, what happens in MRC, LTE call procedure.

2 Answers

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 Qualcomm or ex-Qualcomm Modem Systems Test Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. Less

Need to know wireless communications, digital communications concepts in and out. Less


Tell me about a problem you faces and how you resolved it

2 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 Systems Test Engineer experts who've worked at Qualcomm, who provide this sort of practice through mock interviews. There's a whole list of them curated on Prepfully. Less

Explained a recent work activity

Lockheed Martin

Describe how you would approach filling up a bus with golf balls.

2 Answers

Does the bus have to be in perfect condition? And what is the time frame that it needs to be filled in? And is this going to be a reoccurring event (create an efficient procedure if it is)? And is this how I would be filling up the bus right now, on a budget, or unlimited funds? Does the buss have to be 100% full(again, way different approach)? Different funds = different processes. If there really was a bus and it had to be done that second then I would grab a container (if I could find one) and ask people to help. And if this was a job that had to be done in real life on an instance notice I would try to find out the severity. If it was high enough I might promise people a paycheck or anything else to get workers. The options are astronomical, this is great question... I might have to take this and ask my friends to see how they think. If I could do anything, I would create a funnel system (with a team, because I can do anything. lol). The funnel system would drop the balls in from the windows (different approach needed if 100% capacity is needed, take in account for the curvature of the foof) . There would be a large funnel system that would allow for the balls to loaded by conveyor belt (this allows for flow control, on/off/speed). The conveyor belt would obviously have tracks so the balls would not roll everywhere, and there would be side guards to prevent them from rolling off the side. Side Notes: Dump trucks do not have all the flow control characteristics (This could be faster though, but could also cause damage to the buss or the funnel system due to the sudden momentum) There are really so many options for this, and I would love to write a paper on this now xD hahahaa. Such a great question. But I overthink everything, so there is that. Back to applying for the "DOD Cyber-security Scholarship Program." East Carolina University ain't paying for itself, and neither is the M.S. I am going for after. Wish you the best mate. Less

Grab an empty clean 30 lbs trash can and fill it up.


When you get higher throughput: while going at 5mph and while going at 50 mph? And Why?

2 Answers

high mobility communication is more difficult.

You will get higher a throughput while going at 5mph. Higher speeds indicates that the RF channel conditions such as delay and Doppler spread are changing at fast rate and its a fast fading channel. It is difficult to achieve equalization in such situation. Hence the modulation scheme can be shot down to, say QPSK(2 bits/symbol) from maybe 16QAM(4 bits/symbol) to provide a more robust transmission. This brings down the user throughput. Less


Brief me about yourself

1 Answers

I told all the my background details and all about the project which I did.


They ask me the minimum voltage for LED

1 Answers

Depends the power of the LED


How would you go about writing test cases to thoroughly test a piece of optical equipment?

1 Answers

Testing over the working range to ensure proper functionality. Then, testing outside of the range to ensure any failures that could happen in the field were not catastrophic. Less


questions on data structures and c programming

1 Answers

I answer the question spontaneously


How can you lead with pressure?

1 Answers

I explained that having tight deadlines motivated me even more to pursue a challenging goal and otherwise I wouldn't feel so focused. Less

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