Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 21, Problem 1RQ
Refer to Figure 21–1 to answer the following questions.
When switch HOA SW 122 is in the off position, which contacts have connection between them?
Expert Solution & Answer
To determine
The contacts that have connection between them when switch HOA SW 122 is in OFF position.
Explanation of Solution
Refer the text book Figure 21-1.
Refer the table given in Figure 21 – 1 for the HOA SW 122 switch. The ‘X’ in the table represent a connection and the ‘O’ represent no connection between the contacts.
| HOA SW 122 | |||
| CONTACT | HAND | OFF | AUTO |
| 1 – 2 | O | X | X |
| 3 – 4 | X | O | O |
| 5 – 6 | X | X | O |
| 7 – 8 | O | O | X |
From the table, the contacts that have connection when the HOA SW 122 switch is in OFF position are 1 – 2 and 5 – 6.
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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)
Chapter 21 Solutions
Understanding Motor Controls
Ch. 21 - Refer to Figure 21–1 to answer the following...Ch. 21 - Refer to Figure 211 to answer the following...Ch. 21 - Refer to Figure 211 to answer the following...Ch. 21 - Prob. 4RQCh. 21 - Prob. 5RQCh. 21 - Prob. 6RQCh. 21 - Prob. 7RQCh. 21 - Refer to Figure 21–1 to answer the following...Ch. 21 - Refer to Figure 21–1 to answer the following...Ch. 21 - Prob. 10RQ
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