Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 9, Problem 9.3P
Recalculate L, Cx, and fSRF if the AWG3O wire for the coil of Example 9.2 is replaced with AWG40 wire.
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4. The main terminal voltage across an ON conducting SCR depends on the instantaneous main terminal current in the following way:
a. They are proportional
b. The voltage increases as the current increases, but no quite proportionally
c. The voltage increases as the current increases, by a squared (seond power) relationship
d. They are virtually non-related
5. To turn Off a conducting SCR in a dc-powered circuit, it is necessary to:
a. Interrupt (stop) the gate current
b. Wait for the main terminal current to fall below IHO when the supply voltage crosses through zero
c. Deliver a pulse of negative gate current via the gate lead
d. Place a temporary reverse bias across the SCR’s main terminals
6. In a simple RC charging circuit used for trigger-control of an SCR, a good range of adjustment of the RC time-constant is:
a. 1 to 5 msec
b. 1 to 30 msec
c. 0.1 to 10 msec
d. 2 to 25 μsec
Below is a circuit containing a non-linear element;a) Determine the operating points (two) of the circuit in DC state?b) Find the resistance equivalent of the nonlinear element for the operating points you specified?c) For AC welding, find the instantaneous power of the nonlinear element (considering the element's equivalent resistance at the operating point)?
13. At what amperage differences will a GFCI trip?
14. What do DC and AC stand for?
15. True or False: An electron holds a positive charge
Chapter 9 Solutions
Fundamentals of Electromagnetics with Engineering Applications
Ch. 9 - Given a 2.0-cm length of AWG20 copper wire, (a)...Ch. 9 - Recalculate L, Cx, and fSRF if the AWG3O wire for...Ch. 9 - Estimate L and the SRF if a 99.8% iron core is...Ch. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - If the 2.2-nF capacitor of Example 9.3 has an area...Ch. 9 - Prob. 9.9PCh. 9 - What is the spectral bandwidth for a 4.0-ns rise...Ch. 9 - Prob. 9.11P
Ch. 9 - Prob. 9.13PCh. 9 - Repeat Example 9.5 using AWG22 wire and 200-MHz...Ch. 9 - Prob. 9.15PCh. 9 - Prob. 9.16PCh. 9 - Prob. 9.17PCh. 9 - Shielding low-frequency magnetic fields often...Ch. 9 - Prob. 9.21PCh. 9 - Prob. 9.22PCh. 9 - Prob. 9.23PCh. 9 - Prob. 9.24PCh. 9 - Determine the insertion loss at 40 MHz for a...
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