January 28, 2022: Question of the Week (Heat Transfer)

A newly designed square semi conductor chip (k = 175 W/m∙K) has a width w = 9 mm on a side and a thickness t = 3 mm. 

The chip is mounted in a substrate such that its side and back surfaces are insulated, while the front surface is exposed to a coolant. 

If 92 W are being dissipated in circuits mounted to the back surface of the chip, what is the steady-state temperature difference between back and front surfaces?

Hint: Does this sound complicated to you? If you do your research, you will find that most FE Exam questions can be solved by using only one formula!  You can pass the exam by just becoming familiar with the basic equations in each topic area.  It's that simple. This is what our book is all about.  Forget theory and over complications used by our professors. It's time to transition to real life.  All of the equations are found in the FE Handbook.  The secret to passing is Problem Recognition (literally). 

Doesn't this problem sound like conduction? This is a basic heat transfer problem. What famous equation uses conduction? The essence of our book describes the importance of knowing the layout of the FE Handbook (since the FE Exam is an open book exam!).  If you haven't already, download the FE Handbook from NCEES.org. You have to create an account first.  Now, use the search function (Control -F) on the pdf to look up "conduction".  

What equation do you see?   Yes, it's   that easy!    

Solution:   In the FE Handbook - you will find the equation:

$$P=q=kA\frac{\Delta T}{t}$$

The question is asking for the Temperature Difference, so let's rearrange the equation to find delta T.

The rest is just plug and chug. Be careful though, you need to convert all the mm to m.    

 ΔT=kw2t⋅P​= 0.003m⋅ 92W
------------------
175 W/m∙K  (.009 m)^2

= 19.47 K

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"How to Pass on Your First Try" Prep Book. (Updated 2022-Only $4.95)

Updated for the 2022 Exam. Over 330 Practice Problems  !   

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Are you ready for the 2022 FE Exam? (Download a FREE 10 Question Practice Exam Here)

 

Are you ready for the 2022 FE Exam? Are you up to the Challenge of trying to solve 10 FE EXAM questions?

Simply download a sneak peek into the book from the DOWNLOAD button below.  

It will let you see how the problems are structured and show you examples with detailed step-by-step solutions that reference page numbers from the FE Handbook. It will give you a honest chance to evaluate the practice exams and try it before you buy it.

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2022 Book Update is Live!

The 2022 FE Exam "How to Pass on Your First Try!"EBook and Amazon paperback book is designed specially to teach you how to pass the FE exam.                                                                                              This book does not waste time on theory or obscure problems- which will only confuse you more, but instead, only contains practical questions and ones that are most likely to appear on the actual exam based on the percentages which are published by NCEES.

  
Our research team consists of practicing engineers in industry with real life experience, as opposed to theory-based professors who have been out of school for 20 years. The problems were developed using the NCEES percentage breakdowns on each topic area and are presented in a logical order which will allows you to master the FE Handbook. This book will serve as your Game Plan for exam day.

     By utilizing the percentages from NCEES, the e-book maximizes your exposure to all problem types in shortest amount of time! And by eliminating obscure and hard problem types that have no logic behind them, this book contains only realistic problems and provides excellent practice to prepare you for the ACTUAL exam. We believe that nothing prepares you better than working through actual exam questions.

     Since the FE Handbook is the only reference that you are allowed to have in front of you during the exam, this EBook teaches you how to use the handbook to your advantage. The more familiar you are with the handbook the easier it will be on test day. Every problem’s solution is thoroughly explained, in detail, and cites specific pages in the FE handbook. They are no mystery equations or magical answers, every equation and variable is fully explained and referenced. We show you how to download a free copy of the FE Handbook from the NCEES website.

     For those of you who do not have the time to devote the recommended study time of 8 weeks, our proven FastTrack Section is right for you! Using tips and strategies, it guides you to specific sections in the FE Handbook in each topic that are most likely to appear on the actual exam. This section is also great for anyone who has been out of school for a long time wanting to brush up on basic engineering skills before starting to work the practice problems in the book. It can serve as a nice refresher course.

     This EBook contains over 330 practice problems compiled in (5) Exams. Exam # 1 problems are organized in topic order – which allows you to become familiar with the FE Handbook without having to flip to different areas. The questions will guide you through each section of the handbook so you can learn how every chapter is organized. Exams # 2, 3, 4, 5 are organized in random topic order, simulating the actual exam, allowing you to hone your skills in solving many types of problems thrown at you from all directions. However, since every question in every exam is categorized by topic in the table provided on page 9, you have to option of working on any specific topic if you choose. For example, if you know that your weak area is “Engineering Economics”, use the specification chart on page 9 to find out which question numbers are engineering economics type problems. Flip straight to them and start working.

     This e-book systematically forces you to work through the FE Handbook and only focuses on topics with the highest percentage of showing up on the actual exam. Now, it’s time to learn. Are you ready to get to work?   Download the free EBook preview now!

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How to Pass the FE Exam without Studying

There is a way to pass the FE exam without studying but we don't usually recommend it. You only want to go through this exam one time - registering, filling out all the paperwork, showing up, taking the exam, etc. We all know people who say that this "test was so easy and I didn't even study!". 

Well, unfortunately, this is known as the survivor-ship bias! A survivor-ship bias is the logical error of concentrating on the people or things that made it past some selection process and overlooking those that did not, typically because of their lack visibility. So if there is a large sample of test takers, of course there will be a small percentage, say 1%, of test takers that pass without studying based on pure luck. They will be excited to tell you how easy the test was and how they didn't even study. But the problem is that you will NEVER hear from the 99% who failed the exam. They won't brag about failing after NOT studying. 

The FE Exam is known to be passable with some preparation - view the current passing rates on NCEES.org. But if you really want to wing this exam with the smallest amount of studying.... 

Follow the steps below: 

1) Make a list of the top 3-4 equations used in each of the subjects in your exam topic area. Thermo, fluids, math, dynamics, chemistry, heat transfer, etc. Become very familiar with those. 

2) Don't get stuck on any one question. Skip it. Find the low hanging fruit (easy questions) towards the back of the exam. 

3) If running low on time, and if all answer choices are different, don't bother entering in values like 10^-5 or 10^8 into the formula because the answer will only be off by that factor. This will save you a lot of time.

4) Download the FE Handbook from NCEES.org (It's FREE) and learn the layout before the exam. Get familiar with it. Don't read it like a manual and think that you need to know everything in it in order to pass. It just represents everything that's "fair game". Simply just know where to find the important equations. 

5) If your calculation doesn't match the possible answer choices, take a step back and ask yourself what is the common sense answer in terms of the magnitude of the options listed? 

6) Work through a set of 5 practice questions from each topic area. Our book is specifically designed that way ! The FastTrack Method doesn't waste time on theory or obscure problems, we just jump right into the practice questions and learn theory as we go along. We use the percentage breakdown published by NCEES.org to tailor our study approach!

7) Download the free 10 Question Demo practice exam to see where you stand. 

8) Hopefully you are in the 1% who passes without studying - and then you can tell your friends how easy it was!

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Are you Ready to Pass the FE Exam? (Updated for 2022 !)

Do you want to know the secrets to passing?

Do you want to see practice questions that are similar in difficulty level as the ones on the actual FE exam?   

Do you want to join the rest of the engineers who passed on their first try?

Do you want to get the FE Exam over and without any headaches?

Do You Have Questions like these? 

How hard is the FE? What is the pass rate? How long should I study for? What can I bring on Exam day? What can I expect? All of these are answered in the EBook.   If you would like a paperback book instead, purchase it on Amazon.

What are you waiting for?

Our FE Exam Prep Book is updated for the 2022 Exam, developed by practicing engineers for engineers, provides over 330 practical problems. It provides a complete system of specific test taking strategies, tips and hints, and is separated into 5 practice exams.It's the only FE Exam prep book that has detailed solutions that reference exact page numbers for equations and tables in the FE Handbook. 

There's no BS, no fluff, just straight to the point. It is a must have for working engineers who have been out of the classroom.  

Want to peek into the book and try a few practice problems before you buy it?  

Download Practice FE EXAM

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Forum is LIVE !

 

Our FORUM is back up! Sorry for the inconvenience.  We had issues with bot infestation!  Hopefully, we cleaned it all up.   We'll work on adding all the great content back shortly. In the meantime, please continue to post questions   Thank you !! 

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