Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 21, Problem 8SQ
What is the sequence of the operations if the limit switches, shown in Figure 21–6, are used. (Limit switches were covered in Unit 13.)
Fig. 21–6 Elementary diagram of the reversing starter shown in Figure 21–1. The
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Can you solve for the voltage across 1kohm resistor when both voltage sources are on. Additionally can you solve for when 2V is shorted and 5V is on. Then, when 2V is on and 5V is shorted
a. A silicon sample maintained at room temperature is uniformly doped with ND=10¹6/cm³
donors. Calculate the resistivity of the sample.
b. The silicon sample of part (a) is "compensated" by adding NA=1016/cm³ acceptors. Calculate
the resistivity of the compensated sample.
c. Compute the resistivity of intrinsic silicon at room temperature.
d. A 500 resistor is to be made from a bar-shaped piece of n-type Si. The bar has a cross
sectional area of 102 cm² and a current-carrying length of 1 cm. Determine the doping
required.
μn or μp (cm²/V-sec)
1000
Electrons
Holes
NA or ND (cm³)
1x1014
Мет
Mp
(cm2V-sec)
1358
461
2
1357 460
100
5
1352
459
1 x 1015
1345
458
2
1332
455
5
1298
448
1 x 1016....
1248 437
2
1165 419
5
986 378
1 x 1017
801
331
10
1014
1015
1016
NA or ND (cm-³)
1017
1018
Silicon
T = 300 K
4. Two different silicon samples maintained at 300K are characterized by the energy band diagrams.
Answer the questions that follow after choosing a specific diagram for analysis.
a) Do equilibrium conditions prebail? How do you know?
b) Sketch the electrostatic potential (V) inside the semiconductor as a function of x.
c) Sketch the electric field (ε) inside the semiconductor as a function of x.
EF
Ec
E₁
Ev
E₁
EF
Ev
X
X
0
L/2
L
0
L/2
L
3.
Chapter 21 Solutions
Electric Motor Control
Ch. 21 - How is a change in the direction of rotation of a...Ch. 21 - Prob. 2SQCh. 21 - If a reversing control circuit contains...Ch. 21 - How is auxiliary contact interlocking achieved on...Ch. 21 - After the forward coil has been energized, is the...Ch. 21 - If a mechanical interlock is the only means of...Ch. 21 - If pilot lights are to indicate which coil is...Ch. 21 - What is the sequence of the operations if the...Ch. 21 - In place of the push buttons in Figure 214, draw a...Ch. 21 - From the elementary drawing in Figure 2110,...
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