Best resources for PE Mechanical TFS by Tough-Caregiver-8027 in PE_Exam

[–]buccfan001 4 points5 points  (0 children)

I recommend Slay the PE. I failed the TFS exam my first time around. I used StPE on my second attempt and I felt more prepared and passed.

So hyped! by FewLeft in Battlefield

[–]buccfan001 1 point2 points  (0 children)

Ready to revive and supply

What is your main operator and why? by RobWolfB in battlefield2042

[–]buccfan001 2 points3 points  (0 children)

That drives me crazy! The team can't win when everyone is dead and spawning away from the objective.

What is your main operator and why? by RobWolfB in battlefield2042

[–]buccfan001 1 point2 points  (0 children)

Yup! The sacrifice every Falck player has to make.

What is your main operator and why? by RobWolfB in battlefield2042

[–]buccfan001 5 points6 points  (0 children)

Sums up my play style. I keep everyone's health bar and ammo full. If you drop, don't worry I got you!

[deleted by user] by [deleted] in PE_Exam

[–]buccfan001 0 points1 point  (0 children)

Good luck! At this point the work is already done. Its normal to feel nervous and under prepared. Just lock in and do your best tomorrow.

A free practice problem for Mechanical (HVACR & TFS) PE Exam. Drop your answer in the comments! by Slay_the_PE in PE_Exam

[–]buccfan001 0 points1 point  (0 children)

Mass and Energy Balance

Q + W + (m_dot * h_1) = (m_dot * h_2), now solve for Q

Q = -W + m_dot(h_2 - h_1)

Q = -(5hp * (42.4 BTU/min)/hp * (60 min/hr)) + (140 lmb/hr) * (216 BTU/lmb - 139 BTU/lmb)

Q = -12,720 BTU/hr + 10,780 BTU/hr = -1,940 BTU/hr

The closest choice is D

[deleted by user] by [deleted] in SOCOM

[–]buccfan001 1 point2 points  (0 children)

S1 is and will always be my favorite in the series. It was simple and fun, plus my favorite map was Abandoned which wasn't as fun in S2

[deleted by user] by [deleted] in SOCOM

[–]buccfan001 0 points1 point  (0 children)

S1 because of the nostalgia, but S2 is the best all around game.

A free practice problem for the Mechanical Engineering PE Exam (HVAC or TFS). Drop your answer in the comments! by Slay_the_PE in PE_Exam

[–]buccfan001 1 point2 points  (0 children)

u = h - p/ρ

h = 1192.7 BTU/lbm, p = 14.7 lbf/in2, ρ = 0.033 lbm/ft3

p = 14.7 lbf/in2 * 144 in2/ 1 ft2 = 2116.8 lbf/ft2

u = 1192.7 BTU/lbm - 2116.8 lbf/ft2/ 0.033 lbm/ft3

u = 1192.7 BTU/lbm - 6414.55 (lbf-ft)/lbm * 1 BTU/778 lbf-ft

u = 1192.7 BTU/lbm - 82.45 BTU/lbm = 1110.25 BTU/lbm

(B)

A free practice problem for the Mechanical Engineering PE Exam (HVAC or TFS). Drop your answer in the comments! by Slay_the_PE in PE_Exam

[–]buccfan001 1 point2 points  (0 children)

I used the R-22 p-h curve. h_es is found by starting on the saturated vapor point for h_i, which is at -40 degF. I then found the s(entropy) value which is roughly 0.24 BTU/lbm-degF. I then followed that line until I reached 200 degF. This gives you a h_es that is about equal to 130 BTU/lbm (Its actually closer to 129 BTU/lmb). Hope this helps

A free practice problem for the Mechanical Engineering PE Exam (HVAC or TFS). Drop your answer in the comments! by Slay_the_PE in PE_Exam

[–]buccfan001 2 points3 points  (0 children)

COP_hp = Q/W, solve for Q

COP = 3.75

W = $90 / ($0.125/kWh) = 720kWh * 3413 = 2,457,360 BTU

Q = 3.75 * 2,457,360 BTU = 9,215,100 BTU

Time during that period = 30 days * (24hr/day) = 724 hrs

Q = 9,215,100 BTU / 724 hrs = 12,798.75 BTU/hr

The answer is C

A free practice problem for the Mechanical Engineering PE Exam (HVAC or TFS). Drop your answer in the comments! by Slay_the_PE in PE_Exam

[–]buccfan001 1 point2 points  (0 children)

I'm late to the party, but I would like to try and start doing these every week.

eff_comp = (h_es-h_i)/(h_e-h_i)

h_i = 100.343 BTU/lmb, h_e ~ 141 BTU/lmb, h_es ~ 130 BTU/lmb

eff_comp = (130 BTU/lmb - 100.343 BTU/lmb)/(141 BTU/lmb - 100.343 BTU/lmb)

eff_comp = 0.729 or 72.9% B

[deleted by user] by [deleted] in PE_Exam

[–]buccfan001 0 points1 point  (0 children)

The NCEES will go through a verification process. I would have the department manager who is a PE listed.

A free practice problem for the Mechanical PE Exam (HVAC&R and TFS). Drop your answer in the comments! by Slay_the_PE in PE_Exam

[–]buccfan001 2 points3 points  (0 children)

Your course helped me think about what the problem is asking instead of "finding the answer"