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SLAY THE P.E. BLOG

Dissecting the Mechanical PE - Thermal and Fluids Systems Exam: Problem 506

2/5/2017

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Photo via : Upupa4me
The problems for the afternoon section in the NCEES "Sample Questions + Solutions" book are numbered 501 through 540. This post is about Problem 506 of the Thermal and Fluid Systems sample exam.

Description & Analysis of Problem 506: This is a relatively straightforward U-tube manometer problem. The configuration is very simple and is similar to what is found as a solved example in any Fluid Mechanics or Thermodynamics textbook. The following problem is inspired by a solved example in "Fundamentals of Fluid Mechanics" 6th edition, by Munson, et al.  and is only slightly more complicated than Problem 506.

Thermal-Fluid Systems Exam Sample Problem #1
A closed tank contains compressed air and oil (SG=0.9) as shown in the figure. A U-tube manometer using mercury (SG=13.6 ) is connected to the tank as shown. The column heights are  h1  = 36 in., h2  = 6 in., and h3 = 9 in.
Picture
The pressure reading (psi) of the gage is nearest:
(A) 1.0
(B) 2.0
(C) 3.0
(D)
4.0

Have any questions? Need help? Leave a comment below!
You may download the solution here:
dissecting-01-solution.pdf
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File Type: pdf
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