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: 

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