Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 7, Problem 1RQ
To determine
The number of degrees by which, the voltages of a three phase system are out of each other.
Expert Solution & Answer
Explanation of Solution
Given:
The number of phases of the system
Calculation:
The below figure represents the three phase system.
Figure-(1)
Calculate the number of degrees
Thus, the number of degrees between the phase with each other of a three phase system is
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B:
Find the numerical solution for the 2D equation below and calculate the temperature values for
each grid point shown in Fig. 2 (show all steps).
(Do only one trail using following initial values and show the final matrix)
[T1]
T₂
T3
[T] 1
=
[0]
0
0
d
dx
dx)
(ka)+4(ka)
=
dy
-20xy, k = 1 + 0.3 T
ge
L=3cm, 4x= Ay
B.Cs.:
at x=0=LT=0°C
at y=0-L T=10°C
Fig. (2)
: +0
العنوان
use only
Two rods fins) having same dimensions, one made orass (k = 85 Wm
K) and the mer of copper (k = 375 W/m K), having of their ends inserted
into a furna. At a section 10.5 cm a way from furnace, the temperature of
brass rod 120 Find the distance at which the ame temperature would be
reached in the per rod ? both ends are ex osed to the same environment.
ns
2.05
۲/۱
ostrar
Chapter 7 Solutions
Electrical Transformers and Rotating Machines
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - A wye-connected load has a voltage of 480 V...Ch. 7 - A wye-connected load has a phase current of 25 A....Ch. 7 - Prob. 5RQCh. 7 - A delta connection has 30 A of current flowing...Ch. 7 - A three-phase load has a phase voltage of 240 V...Ch. 7 - If the load in question 7 is connected in a wye,...Ch. 7 - An alternator with a line voltage of 2400 V...Ch. 7 - Prob. 10RQ
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