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Got it. Thanks!

How is Pvp negative 1inHg? Is that because this is a condenser? The MERM says vaporization and condensation at constant temperature are equilibrium processes. If this was a different type of system the Pvp would be typically be different than the gage pressure right?

Page 21-14 in the MERM 13th edition should help you out. You basically have to use the flue gas to create a balanced combustion equation and then find the volumetric fraction of the H2O. Equation 21.13 on that page in the merm should take you the rest of the way. I will admit it took me way too...

So if you are given both temperature and pressure, you should use temperature rather than pressure for finding the enthalpy of a liquid?

How does Hatm = Hvp? How do you know what either is if you dont know the temperatures? If the water is 70 degrees, Hvp is .84. For 1 inch of mercury I'm getting a head of around 1 or 2 feet depending on the temperature. Also, if you say that the pressure is a vacuum of 1 in HG, wouldnt the...

Am I approaching this one correctly? I found the dew point of the products and in order to prevent condensation, the temp of the gas in the boiler can't be reduced pass the dew point. So you have (m_gas)(Cp)(750-T_dp) = (m_steam)(h_fg @ 50psi) then solve for the ratio. I got .1733 this way.

Still sending? :) [email protected] Thanks!

I also got D. At first glance I was ready to bust out the isentropic flow table since Mach is over .3.

I plan on getting there an hour early (my time says 7:15). Ill be up that early anyways due to having early riser babies!

Do they typically have a place where you can leave your stuff behind before you go into the test area?

Just got my authorization form and it says that no food is allowed in the facility. Later on it says pack a lunch. What do I do?!?!

I am unable to actually sit down for 8 hours to take a mock, but I have been timing myself with a stop watch app for each problem I do to make sure I'm doing them fast enough. I would at least do that. Timing is key. 

I just ordered it. I was looking for more questions since I feel like I've been through everything else multiple times.

FYI, in the merm (13th edition), I have page 23-16 book marked which makes for a quick reference for just about all MWs for gas fuels you will see. This has all the data mike was talking about already tabled for you. 21-9 has a table of balanced combustion equations for a quick reference...

In my 13th edition the answer choices are 150 vs 160 rather than 155 vs 160. Makes it a bit easier to decide :)

Are you talking about problem 35.g in section 17 in the merm practice problems?

I agree with Mike for the weber problem. Even though I looked up surface tension to be force/length in about 30 seconds, I also broke up the problem into units replacing a kg*m/s^2 with N along the way and came up with N/m.

This is what I did and I got Q, but I got stuck trying to figure out the area of the throat in order to solve for velocity. Unless I read the question wrong and "just upstream of the meter" means the area before the diameter reduction? I guess the meter starts at the larger diameter since thats...

This one is confusing me. You aren't given the density of the manometer fluid or the dimensions of the narrow section... are you supposed to use some sort of similarity ratio? Even if you do and find the flow rate for h=4 that way, you dont have A2. Am I going the right direction?

To those who took the revised exam recently. Which practice exam was most similar to the real exam? A reviewer on amazon said the NCEES practice exam was very different than the real exam. I've pasted the review below.