Systems Engineer Interview Questions

Antenna Systems Engineer at Apple was asked...

Sep. 1, 2015

What do you think you will be doing in five years? A simple calculation of Noise Figure. Calculation of harmonics.

2 Answers

I'm now complete university IT engineering I'd like work to company Apple my best dream for me please help me

I love apple products and I'd like to learn and master products then take more responsibilities in the future.

Secretary to Medical Staff at Sunnybrook Health Sciences Centre was asked...

Feb. 11, 2014

Please give me an example of two of your weaknesses.

2 Answers

RF Systems Engineer at Kepler Communications was asked...

Feb. 1, 2018

what is the physics behind Shannon limit?

2 Answers

There are no physics "behind" the Shannon Limit (or the Noisy Channel Coding Theorem). This theorem holds as a consequence of Fano's Inequality. It is a mathematical THEOREM that is necessarily true, regardless of the laws of nature. Fano's inequality is a consequence of the Gibbs Inequality, which is a mathematical theorem on the entropy of a discrete probability distribution. Now the Gibbs Inequality is used extensively in statistical physics (statistical mechanics and thermodynamics) to build theories on stochastic physical systems. To say that there are physics "behind" the Shannon Noisy Coding Theorem is wrong and confused, There are mathematics "behind" both the Shannon Limit and results in statistical physics, but the statistical physics results are in no way "behind" the results of Mathematical Information Theory. In fact, this truth is one of the most profound and celebrated aspects of Information Theory, namely that it is true in every possible world, not just in our own physical world. :-) There is an analogue to Fano's Inequality in physics, known as the Gibbs Inequality, which is used extensively in statistical physics. It's

There are no physics "behind" the Shannon Limit (or the Noisy Channel Coding Theorem). This theorem holds as a consequence of Fano's Inequality. It is a mathematical THEOREM that is necessarily true, regardless of the laws of nature. Fano's inequality is a consequence of the Gibbs Inequality, which is a mathematical theorem on the entropy of a discrete probability distribution. Now the Gibbs Inequality is used extensively in statistical physics (statistical mechanics and thermodynamics) to build theories on stochastic physical systems. To say that there are physics "behind" the Shannon Noisy Coding Theorem is wrong and confused. There are mathematics "behind" both the Shannon Limit and several results in statistical physics, but the statistical physics results are in no way "behind" the Shannon Limit mathematical result. In fact, this truth is one of the most profound and celebrated aspects of Information Theory; namely that it is true in every possible world, not just in our own physical world. :-)

Associate Systems Engineer at Cisco Systems was asked...

Apr. 27, 2015

The interviewers do a very good job of tailoring their questions to the candidates. The most important thing to do is to be honest. When they ask difficult questions they are trying to assess your level of knowledge and they understand if you don't know the answer. Just be upfront and honest. Say out right that you don't know but that you will get back to them with the right answer. Then, actually follow up with them.

2 Answers