INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780357670590
Author: Herman
Publisher: CENGAGE L
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Chapter 4, Problem 10RQ
A large motor has a full load current rating of 425 amperes. Current transformers with a ratio of 600:5 are used to reduce the current to the overload heaters. What should be the full load current rating of the overload heaters?
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The tensile 0.2 percent offset yield strength of AISI 1137 cold-drawn steel bars up to 1 inch in diameter from 2 mills and 25 heats is
reported as follows:
Sy 93
95
101
f
97 99
107 109 111
19 25 38 17 12 10 5 4
103
105
4
2
where Sy is the class midpoint in kpsi and fis the number in each class.
Presuming the distribution is normal, determine the yield strength exceeded by 99.0% of the population.
The yield strength exceeded by 99.0% of the population is
kpsi.
Solve this problem and show all of the work
I tried to go through this problem but I don't know what I'm doing wrong can you help me?
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INDUSTRIAL MOTOR CONTROL
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