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SLAY THE P.E. BLOG

Dissecting the Mechanical PE - Thermal and Fluids Systems Depth (PM) Exam: Problem 502

4/11/2016

1 Comment

 
Picture
Photo via : Les Chatfield
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 502 of the Thermal and Fluid Systems depth (PM) section.

Description: The statement for Problem 502 provides a mass flow rate in a pipe and asks for a cross sectional area required to keep the flow  velocity within a given value.
Analysis: Problem 502  is not  complicated if you understand the relationship between mass flow rate and flow velocity. This relationship involves the fluid's density. The only  complication in this particular problem is possibly not being versed well enough in the use of  steam tables to obtain the density.

Here's a similar problem that tests this concept, to give you  additional practice:

Thermal and Fluid Systems Depth (PM) Exam Sample Problem #2
A steam condenser operating at steady state admits steam at 5.0 psia with 50°F of superheat. At the discharge, the flow rate of saturated liquid is 400 gpm. The flow velocity at the inlet is 50 times greater than at the outlet...
The inlet to outlet pipe diameter ratio is nearest:

(A) 0.1
(B) 10
(C) 100
(D) Cannot be determined

You  may download the solution here:
dissecting-02-solution.pdf
File Size: 297 kb
File Type: pdf
Download File

Have questions? Need help? Leave a comment below.
1 Comment
Ashton Walsh link
1/8/2021 01:01:21 am

I really enjoyed your blog thanks for sharing

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