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Validation Engineer Interview Questions

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You have 8 pennies, 7 weight the same, one weighs less. you also have a judges scale. Find the one that weighs less in less than 3 steps.

13 Answers

Set two pennies aside, put 3 on each scale and if they weight the same the lighter one is one of the other two, if not it is one of the three on the scale, repeat for the two or three remaining.

A better answer: Split the 8 pennies into 3 groups of 3,3,2 pennies. Weight the first two groups of 3 pennies each. Case 1) - They weight the same. Therefore, take third group of 2 pennies and find the lighter coin. Case 2) Group 1 weights more than Group 2. Take group 2 (3 pennies) and pick any 2 out of 3. If they weight the same, then the third penny is lighter. Answer is trivial if they don't weight the same. It works for any scenario. Always split the groups in 3.

It's a lot simpler than you'd think Divide the current number of coins by two and put them on both sides of the scale, remove the side that weighs more, and divide the lighter side in half, repeat so you start with 8: |||| |||| (4/4) || || (2/2) | | (1/1) Three steps, simple, logical, and and can get the right answer each time.

For a 1GHz bandwidth oscilloscope, what will happen if you use it to monitor a 1GHZ square wave. If the Vpp of the square wave is 1V, what's the Vpp of the waveform shown on screen.

6 Answers

what is the cycle time of this circuit give 2 flops and some combi logic in between

2 Answers

Questions on reflection coefficients, return loss, insertion loss, return currents in PCB, EMI concerns, etc.

1 Answer

What did I do while I was unemployed for over 1 year.

1 Answer

Explain what does #define do.

1 Answer

Asked about work history.

1 Answer

Where do you see yourself in 5 years?

1 Answer

Is this what you want to do for the rest of your life?

1 Answer

What are the differences between all of the Intel CPU architectures? The answer had to be provided in detail with specifications included.

1 Answer
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