Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 1.2, Problem 6RQ
To determine
The primary objective of the national electric code (NEC).
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d. the temperature between interfaces of two layers of insulation.
List 3 objectives of reliability.
p. No -
EXP. Name: Resistance connection.
EXPAIM: to know the connection resistance types and to
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Theory:
The electrical resistance is the resistant of the conductor
to the current have a constant value. Three kinds of
resistance connection:
1-Series connection:-
In a series circuit,(fig ),the current is the same through all
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The total resistance
R1 R/+R2+Ri.
By ohms law,the current "I" is
1-E/R:
Applying kirchoffs voltage law around closed loop of
fig( 1) we find:
EVI+V2+V3
Where
Vi-IR1
V IR2
V IR3
I is the same throughout the circuit
Vi=R/E/R
V2=R2E/R/
V=R3E/R
Page
LEC
DR. MOHAMMED ALTEMIMI
EQUILIBRIUM
HW
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AC
A person holds a 30-kg suitcase by its handle as indicated in the figure.
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Determine the tension in each of the four identical links AB.
309.81) N
35°
B.
=3000 N:
W 8. During an engine test on the ground,
Chapter 1 Solutions
Electric Motors and Control Systems
Ch. 1.1 - Does the severity of an electric shock increase...Ch. 1.1 - a. Calculate the theoretical body current flow...Ch. 1.1 - Normally a 6 volt lantern battery capable of...Ch. 1.1 - Prob. 4RQCh. 1.1 - What circuit fault can result in an arc flash?Ch. 1.1 - Defineeach of the following terms associated...Ch. 1.1 - Explain why an arc flash is so potentially...Ch. 1.1 - State the piece of electrical safety equipment...Ch. 1.1 - Outline the safety procedure to follow when you...Ch. 1.1 - List three pieces of personal protection...
Ch. 1.2 - Prob. 1RQCh. 1.2 - Prob. 2RQCh. 1.2 - Prob. 3RQCh. 1.2 - List the seven steps involved in a...Ch. 1.2 - Prob. 5RQCh. 1.2 - Prob. 6RQCh. 1.2 - How are the standards contained in the...Ch. 1.2 - Explain the difference between a Code Article and...Ch. 1.2 - Prob. 9RQCh. 1.2 - Prob. 10RQCh. 1.2 - Prob. 11RQCh. 1.2 - Prob. 12RQCh. 1.2 - The voltage between the frame of a 3-phase 208...Ch. 1.2 - Prob. 2TCh. 1.2 - Prob. 3TCh. 1.2 - A hot stick is to be used to open a...Ch. 1.2 - An employee is contemplating using his lockoutlock...Ch. 1.2 - Prob. 1DTCh. 1.2 - Prob. 2DTCh. 1.2 - Why can birds safely rest on high-voltage...
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