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If you are deciding between the two, I think HVAC would be a better choice.  The pass rate is almost 10 points higher and you were already very close.  Maybe not the best metric in making a determination but just my 2 cents.  Just make sure you understand the concepts and do lots of practice...

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You are notified through email when results are available regardless of outcome. Having said that, OP doesn't sound very confident.  I think anybody could pass any of the exams if you study enough, however it' easier when you are already comfortable with the material.  Look at the specifications...

I would also like to share my gratitude with EB. So many supportive people always willing to help out. Thanks everyone!

Forgot to mention that I too used the NCEES practice problems to get a general sense of the level of difficulty of the exam. The MERM practice problems are much more difficult (which is good).  After having taken the exam, I could probably have just studied the Thermal and Fluids along with some...

The biggest resource I used was of course the MERM 13ed. Also used the accompanying MERM Practice Problems and the rather expensive Quick Reference book. With few exceptions, did almost every practice problem of every chapter in the book. Placed additional emphasis on Thermal and Fluids related...

Found out I passed! Self study with many weekends on the couch. I thought Thermal and Fluids was pretty hard. Could have gone either way but glad it's over. 

Just curious did you go for Senior or Technologist? Thinking about getting my Senior.

I took TFS as well.  Thought morning was pretty difficult, afternoon was not as bad but still found myself guessing on several.  I too wanted to feel confident coming out of that test.  Now, I'm dreading the wait because I know if I don't pass it will be just barely which makes it that much...

I'm trying to understand when to use MERM Eqn 36.28 vs Eqn 36.31.   It states that the former is used for constant heat flux and the latter for constant wall temp but what does this mean exactlly?  Just want to know if there is a rule of thumb for knowing when each is applicable based on problem...

I have just accepted the marginal difference. As long as you know that isentropic values are used to find actual values (when efficiency applies) then I think it will be fine.   If a problem arises in which a particular method is required to yield the correct answer, then I will take note and...

Or must you only use isentropic temperatures for the isentropic relations?

Does this mean it would be acceptable to use the T actual (from Eqn 29.21 or Eqn 29.23) and substitute into isentropic relations (Eqn 29.2 through Eqn 29.19)? 

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This seems like one of the easier questions, but the answer doesn't make sense to me.  It uses more geometry than T&F.  The screw won't fit until the hole is tapped in step 3, but the solution uses the hole initially drilled from step 1.  I get .233 (B) as my answer since 3/8 + 2*.233 = .78. 

I don't think this explains away the discrepancy. Both methods assume only air. 

It doesn't specify to treat as ideal gas or use air tables. What's interesting is that the solution I'm looking at and the example you referenced both have about the same value for T_B when using the alternative method to compare. It's only T_D that has a much larger percent difference.   So...

I'm working a Brayton Cycle problem, but I'm getting two different answers when trying to solve and I can't figure out why.  Given: Pressure Ratio = 8:1 Combustor Temp prior to Turbine = 1253K     App 23.S determines p_r prior to turbine =284.3 Trying to find Temp after Turbine Method 1...

Thanks for the illustration.  This is an excellent way to visualize what is going on. 

I see where you are going with this.  I think you meant sat liquid in part one since you are dealing with subcooled.  What had me questioning this is one of the solutions in the Practice Problem book by Lindeburg just uses a T = T_sat assumption to find h directly and I wasn't sure why P= P_sat...