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SLAY THE P.E. BLOG

Dissecting the Mechanical PE - Thermal and Fluids Depth (PM) Exam: Problem 505

6/16/2016

1 Comment

 
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Photo via : Zyada
The problems for the afternoon section in the NCEES "Sample Questions + Solutions" book are numbered 501 through 540. In this post we provide an analysis of Problem 505 of the Thermal and Fluid Systems depth (PM) section.

Description of Problem 505: You are given the flow rate through an orifice plate flow meter and are asked to calculate the corresponding pressure drop.

Analysis of Problem 505: The relationship between pressure drop and flow rate for an orifice meter is a simple equation available in any Fluid  Mechanics textbook. There is a solved example in the ME Review Manual by Lindeburg that is virtually the same as this problem.

Here is a problem we've crafted dealing with a venturi flow meter to test your understanding of the equations that apply to these flow metering devices.

Thermal and Fluid Systems Depth (PM) Exam Sample Problem #5
A venturi meter is installed in a 2-in diameter, schedule 40 steel pipe (ID = 2.067 in). The fluid in the pipe is ambient temperature No. 4 fuel oil with a specific gravity SG=0.85. The meter is provided with a U-tube manometer. From past experience with this meter, it is known that for a manometer fluid height, h, of 8 inches, the oil flow rate is 400 gallons per minute.
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The average fluid velocity (ft/min) in the pipe just upstream of the meter when the height h=4 inches, is most nearly:

(A) 27
(B) 200
(C) 1,225
(D) 1,623

Have questions? Need help? Then leave a comment below.
You may download the solution here:
thermal_fluids_dissecting-05-solution.pdf
File Size: 293 kb
File Type: pdf
Download File

1 Comment
Agatha Pace link
11/21/2020 12:26:30 am

Great post, thank you

Reply



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