EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Chapter 28, Problem 3RQ
The two stop push buttons in Figure 28–2 are connected in series with each other. What would be the action of the circuit if they were connected in parallel, as shown in Figure 28–6?
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using the theorem of three moments, find all the reactions and supports
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A) In a factory, an s-type pitot tube was used to calculate the velocity of dry air for a point
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Calculate the velocity at that point (ft/sec) using following conditions:
●
•
•
Pressure = 30.23 ± 0.01 in Hg (ambient)
Pitot tube coefficient = 0.847 ± 0.03
Temperature = 122 ± 0.1 F (stack)
Temperature = 71.2 ± 0.1 F (ambient)
AP = 0.324 ± 0.008 in H2O (pitot tube)
•
AP = 0.891 ± 0.002 in H2O (stack)
B) Find the dominant error(s) when determining precision for the problem.
C) For part A, what is the precision in ft/sec for the velocity?
Chapter 28 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
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