Category: PE exam practice – What is the answer?

What is the answer? question 3

What is the answer image

Today’s What is the answer blog has a dynamics question.  Here we go…

You are driving a car at 90 km/hr on a dry road and suddenly brake to stop.  If the coefficient of friction between the tires and the road is 0.63 what is the minimum stopping distance?

A. 34 m

B. 40 m

C. 51 m

D. 73 m

What is the Answer?

So, solve the problem and leave a comment below with you answer.  As always, please share this with others so they can have practice.  Now would also be a great time to go like the Mechanical PE Academy Facebook page!


What is the answer? question 2

What is the answer image

Today’s What is the answer question comes from mechanics of materials.   Here we go…

A 1/2 inch diameter steel rod is stretched between two fixed points.  At a temperature of 72 degrees Fahrenheit the tensile load in the rod is 850 pounds.  At approximately what temperature (in degrees Fahrenheit) will the stress in the rod be zero?

A.  85

B.  95

C.  105

D.  115

What is the answer

Work the problem and comment below with your answer.  As always… please share this post with others!  After all of that please head on over to the Mechanical PE Academy Facebook page and give it a like!

What is the answer? question 1

What is the answer image

What is the answer?  Thermodynamics question 1

Today’s question is a quick thermodynamics question.  Here we go…

A refrigerator has a coefficient of performance of 6.0 and the room temperature outside the refrigerator is 28 degrees Celsius.  The lowest temperature (in Celsius) that can be obtained inside the refrigerator is:

A.  5

B.  -10

C.  -15

D.  12


What’s the answer?

Work the problem and see if you can find the correct answer.  Give a comment below with the answer once you are done.  Also, share this with other so that more people get the practice.  Once you have done all of that… head on over to the Mechanical PE Academy Facebook page, where you will get updates and exclusive content.

Introduction to the ‘What is the answer?’ blog series

What is the answer - test

For every pass I caught in a game, I caught a thousand in practice.”  ~ Don Hutson

Welcome to a new blog series… What is the answer?

Let me see if I can summarize the typical engineer wanting to take the PE exam.  You graduated from college and quickly started your first real engineering job.  Almost immediately you forget most of what you worked so hard to learn during college.  Your new job doesn’t require you to use most of your education, so you gradually forget even more.  You work for 4 years or so… and now you want to take the PE exam.  You grab a few books to start reviewing for the exam, and it is at that moment you realize that you don’t remember any of this!  Simple statics problems seem unbelievably difficult!  The only thing you remember about thermodynamics is that there is no such thing as cold… only absence of heat!  How are you going to relearn all of this material for the exam?

If that sounds anything like you… you are not alone!  Relearning all of that material must be a gradual process.  One must work a lot of problems to practice the material again.  How do you find the time to work a lot of problems?  That is where this blog series can help!

So what is this blog about?

The best way to relearn the material is to continually work a lot of problems!  Practice! How do you find the time to work a lot of problems?  That is where this blog will help you.  I will do the tedious process of coming up with questions.  All types of questions.  This is getting free practice exam questions!  They will cover all the different areas that are needed for the PE exam.  I will post a question along with 4 possible answers.  Your job… find the answer.  Post a comment with what you think the answer is.  This is a GREAT way to get practice throughout the week.  This is a GREAT way to learn from your peers working the same problem!  Give comments on how you solved the problem.  Start discussions about which answer is correct.  If you practice solving problems as part of your routine you will get faster at solving these problems.

What types of problems will be on the blog?

I will include all types of problems of different difficulty levels.  Some long problems and some short problems.  They will cover different topics in engineering and math.  You may think some questions are very easy… GREAT!  But remember… other people will find those questions difficult.  Everyone will have different areas of expertise and different starting points.  If you know how to work the problem help others figure out the solution.  Have fun with the process and participate in the extremely powerful peer learning!!

Let me know what you think!

I am excited about this series, but what are your thoughts?  What topics do you need the most help with?  As always, feel free to leave comments to help me develop this blog.  Also, take a second to share this blog with others so they can join in on the solutions.

As always feel free to leave a comment!  Be sure to check out the Mechanical PE Academy Facebook page for updates and exclusive content!