Search results

This post is regarding new material only. We haven't checked if they fixed the typos that have been reported.  If you find anything else, please add to this thread. Section 2.16.5.6 Helical Gears is completely new. The old section 2.16.5.6 Planetary Gears is now 2.16.5.7 Section 9.1.7 "Heat...

Congratulations!!!

We've added a two-part series on refrigeration, covering:  Ideal Vapor Compression Cycle,. Multi-Stage Vapor Compression and the Ideal Gas Refrigeration Cycles.  Access them for free here: https://www.slaythepe.com/coaching-plan-members.html

This was already clarified in this previous post: http://engineerboards.com/topic/33324-necees-mechanical-pe-reference-manual-released/?do=findComment&comment=7618245

In the “technical data”...

OK, thanks.

We have now uploaded video tutorials for the Carnot Cycle, the Brayton Cycle, and the Combined Gas-Vapor Power Cycles. Access them for free here: https://www.slaythepe.com/coaching-plan-members.html

Good catch. It appears that of the highlighted values, only the one for 64F is incorrect (it should be 0.3 psia). Did you report this to them?

Update: We just uploaded a 3-part series on Entropy, Entropy Balances, Isentropic Processes and Isentropic Efficiency, as well as a tutorial on the Mollier and P-h Diagrams. https://www.slaythepe.com/coaching-plan-members.html

Nicely done!

No. Just never use ideal gas assumptions for steam. It’s safer that way. Use tables or a Mollier diagram.   For this particular problem: If you start at 3 psia and compress, there is some liquid present at the “inlet” therefore that liquid-vapor mixture is far from being an ideal gas. So...

1. With the inlet conditions, find the enthalpy at the inlet, h1, and entropy at the inlet, s1 2. The entropy at the discharge for the isentropic process (s2s) is the same as s1, so for the isentropic process you have s2s and pressure. 3. Is s2s < sg at 3 psia? If yes, you have a saturated...

Dense gases such as steam in power plants and refrigerants in refrigeration cycles in general cannot be modeled as ideal gases. Only when the pressure is VERY low can steam be treated as an ideal gas (this is done in psychrometrics, where the partial pressure of water vapor is in the order of...

Really hard to say. Maybe the end of this fall.

Thanks! Yes, it was left out for the sake of brevity. I think we will have a short tutorial just on linear interpolation. Oh, absolutely yes. We’ve been advocating for Mollier diagrams here for the longest time. That video (just on how to use h-s and P-h diagrams) will come after entropy and...

We have been developing video tutorials for the TFS exam. When we finish all of them, we will put them behind a paywall and offer a course based on these videos. For now, as we develop them they will be free. There will be roughly about 50 videos to cover all of TFS. As of the writing of this...

Yeah, we're working on it. Probably ready by late 2020. Hopefully by then you will not need it :)

This is correct. Hence our book would cover all you need for the supporting theoretical principles questions, but you will still need another resource to prepare for the applications part. If you do get our book, I think you would be OK if you skipped the following: In Part I: THERMODYNAMICS...

They each have their pros and cons. In the real world, most steam power plants have a combination of both. Here's something I found in one of my thermo textbooks, which explains the pros and cons better than I ever could: Open feedwater heaters are simple and inexpensive and have good heat...

Hi. Please check your PMs.