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Validation Engineer interview questions shared by candidates

## Top Interview Questions

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Systems Validation Engineer was asked...May 6, 2010

### 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.

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. Less

Neil has it right. Dave - the question says less than three steps.

I Can do it in one step: Look at the year on the pennies. If 7 pennies weigh the same it means that all 7 were manufactured either before or after 1982, when the mint changed the composition of the coin from solid copper to copper with a zinc core. the one that weighs differently was minted on the opposite side of 1982 as the 7 other pennies. Less

### 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.

It will show a sine wave. The oscilloscope bandwidth should be comparable to the rise and fall time of the square wave.Same question was asked to me. Less

for a 1Vpp square wave, the amplitude of it's fundamental f0=1GHz component is 2/pi and assume the bandwidth given is 3dB bandwidth then you got half of it original amplitude at 1GHz which is 1/pi Vpp ~= 318mVpp Less

Due to bandwidth limit of scope, it will represent 1GHz square wave as 1GHz sine wave with a little higher than 1V p-p based on Fourier series. However, if bandwidth is just 1GHz, then roll-off effect comes in (70.7% of original signal), it might be 800-900mV. Less

### Conversion from hexadecimal to binary. The brain teaser: You have two cups, one that can hold up to 5 quartz of water and the other 3 quartz. Get me to 4 quartz of water.

Fill 3 quartz cup with water, pour it into the 5 quartz cup. Now 5 quartz cup is 3/5th full Again fill the 3 quartz cup and fill the remaining of 5 quartz cup using that. Now 5 quartz cup is full, and 3 quartz cup has 1 quartz water. Empty the 5 quartz cup and pour the 1 quartz water from 3 quartz cup into the 5 quartz cup. Fill the 3 quartz again and pour it into the 5 quartz cup which now has (1+3) = 4 quartz 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 Intel or ex-Intel Systems Validation Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews Less

-empty half amount of water from 3 quartz cup. -empty half amount of water from 5 quartz cup. -pour remaining water from 3 quartz cup to 5 quartz cup or vice versa. Less

### technical software and bits questions

good

Can you plz discuss more in detail about technical interview and questions on bits. What questions were asked 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 Intel or ex-Intel Validation Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews Less

### What is the difference between find and grep in Unix?

Find is to find files within a directory structure, grep can be used to find specific text within files. Less

Find is used to search for files and folders within a directory whereas grep is used for finding a pattern in a file. Less

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

T&gt;= t(c-&gt;q of 1st flop)+ t(delay) + t(setup of second flop) - delta(skew)

Can you elaborate on what questions were asked in Phone interview?

### A bear climbs up a very tall tree upto 5 metres and then falls to ground in a second. What is the colour of the bear?

Red because of blood stain after falling

Red because of blood stain after falling

### Sort an array of numbers in O(NlogN) complexity.

Implement Merge sort

Quick sort

### What do you know about ARINC 429 protocol in terms of railways security. Rolling stock knowledge etc.

ARINC 429 is one of the most prevalent specifications in use today for communicating between avionics components on commercial aircraft. It was created in response to lessons learned from the use of older equipment specified by ARINC 419. If you are new to ARINC-429 you may wish to check out our tutorial below. Less

ARINC 429 is one of the most prevalent specifications in use today for communicating between avionics components on commercial aircraft. It was created in response to lessons learned from the use of older equipment specified by ARINC 419. If you are new to ARINC-429 you may wish to check out our tutorial below. Less