Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 2, Problem 10SQ
Select the best answer for each of the following.
Thermal overload protection
a. aids motor warm-up.
b. prevents motors from freezing.
c. protects motors and conductors from
d. provides overcurrent protection for motors.
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A lossless uncharged transmission line of length L = 0.45 cm has a characteristic impedance of 60 ohms. It is driven by an ideal voltage generator producing a pulse of amplitude 10V and width 2 nS. If the transmission line is connected to a load of 200 ohms, sketch the voltage at the load as a function of time for the interval 0 < t < 20 nS. You may assume that the propagation velocity of the transmission is c/2. Answered now answer number 2.
Repeat Q.1 but now assume the width of the pulse produced by the generator is 4 nS. Sketch the voltage at the load as a function of time for 0 < t < 20 nS.
Chapter 2 Solutions
Electric Motor Control
Ch. 2 - If the contacts on a manual starter cannot be...Ch. 2 - If the handle of an installed motor starter is in...Ch. 2 - How may an automatic operation be achieved when a...Ch. 2 - What does the term trip-free mean as it relates to...Ch. 2 - Prob. 5SQCh. 2 - Prob. 6SQCh. 2 - Prob. 7SQCh. 2 - Prob. 8SQCh. 2 - Select the best answer for each of the following....Ch. 2 - Select the best answer for each of the following....
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- Solve this experiment with an accurate solution, please. Thank you.arrow_forwardA lossless uncharged transmission line of characteristic impedance Zo = 600 and length T = 1us is connected to a 180 load. If this transmission line is connected at t = 0 to a 90 V dc source with an internal resistance of 900, from a bounce diagram of this system sketch (a) the voltage at z=0, z=L, and z = L/2 for up to 7.25μs and (b) calculate the load voltage after an infinite amount of time.arrow_forwardA lossless uncharged transmission line of length L = 0.45 cm has a characteristic impedance of 60 ohms. It is driven by an ideal voltage generator producing a pulse of amplitude 10V and width 2 nS. If the transmission line is connected to a load of 200 ohms, sketch the voltage at the load as a function of time for the interval 0 < t < 20 nS. You may assume that the propagation velocity of the transmission is c/2.arrow_forward
- The VSWR (Voltage Standing Wave Ratio) is measured to be 2 on a transmission line. Find two values of the reflection coefficient with one corresponding to Z > Zo and the other to Zarrow_forwardA dc voltage of unknown value Vand internal resistance Reis connected through a switch to a lossless transmission line of Zo = 1000. If the first 5 μS of the voltages at z = 0 and z = L are observed to be as shown below, calculate Vo, RG, the load resistanceR,, and the transit time T. 100 + [V]:-0. V 90 [V]:-V 100 75 I, Տ 1,μs 2 4 6 0 2 4 6arrow_forwardA lossless open circuited transmission line behaves as an equivalent capacitance of Ceq = Tan (BL) Show for BL << 1 that Ceq = C'L where L is the length of the transmission line and wZo C' is the lumped parameter capacitance per unit length of the transmission line. Hint: For x small, Tan(x) = x.arrow_forward= A generator with VG 300V and R = 50 is connected to a load R = 750 through a 50 lossless transmission line of length L = 0.15 m. (a) Compute Zin, the input impedance of the line at the generator end. (b) Compute and V. (c) Compute the time-average power Pin delivered to the line. (d) Compute VL, IL, and the time-average power delivered to the load, PL (e) How does Pin compare to PL? Explain.arrow_forwardFor the regulated power supply circuit, assume regular diodes with 0.7V forward drop. Use a 15V (peak), 60Hz sine wave at the transformer secondary and assume a maximum ripple level of 1V. (a) Compute the unknown components needed to design 10V DC supply.Hint: find R first, and then C. What is the ripple level for C=22µF?Sketch the rectified, filtered, and regulated outputsarrow_forwardA) Find the solution of B) Find the convolution of Sewt (t-π)dt 8 e-atu(t)e-blu(t)arrow_forwardConsider the signal: f(t)= 0, ㅠ 1 Use the Fourier transform formula to find F(w). otherwisearrow_forwardA half-wave controlled rectifier is supplied by a 230 Vrms voltage source and has load resistance of 2502. Calculate the delay angle a that produces a load-absorbed power of 200W.arrow_forwardQ6 The FET shown in Fig. 1.43 has gm = 3.4 mS and rd =100 K. Find the approximate lower cutoff frequency. Ans: 735.1 Hz. 25V 1.5ΜΩ 20 ΚΩ 0.02µF HH 2ΚΩ 0.02µF HH 330kQ 820 ΩΣ 1.0µF www 40ΚΩarrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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