Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Textbook Question
Chapter 3, Problem 5SQ
What causes the AC hum or chatter in AC electromagnetic devices?
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Draw the equation USE BY HAN
Problem a. (i) Sketch the ideal power curve of the turbine with the following characteristics:
• rated speed is 14 m/s
⚫rated power is 1.25 MW
⚫ cut-in speed is 5 m/s
⚫furling or cut-out speed is 20 m/s
(ii) Given part (i), calculate the energy produced in one day if the wind blows
continuously between 15 and 20 m/s all day
(iii) Can the energy produced in one year be determined if you are told that the
average wind speed is 14 m/s? Explain why.
Problem b. Suppose an anemometer mounted at a height of 10 m with a 20-m/s average wind
speed
(i) Estimate the average wind power at a height of 10 m, assuming Rayleigh
statistics and under the following weather conditions
• 15°C
(ii) Suppose a 1300-kW wind turbine with 60-m rotor diameter is located in those
winds with speed computed in the first condition of part (i). Determine the annual
energy production with a 30% wind turbine efficiency
(iii) Evaluate the wind turbine capacity factor
Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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- A reflex klystron operates at the pcak of the n-2 mode. If (V1/Vo)-0.363, find the efficiency. Assume β=1. X" 1 1.2 1.52 2 2.408 Ji(X) 0.44 0.5 0.55 0.58 0.582arrow_forwardSolve question 1arrow_forwardFor the system below: if == m₁ =m₂ = 1 kg. k₁ = k₂ =1 Nm1, b = 20 N/ms"; then: 1) Find the transfer function () f(s) 2) Check the stability by Routh criteria method.arrow_forward
- If you have T.F.C.L.= k then: s2+2 5+k • 1) Find the open loop G(s). 2) Determine Steady state error for (unit step, ramp input, and acceleration input) 3) If es = 0.2, for ramp input, then find k,wn, 8. 4) For values in (3), then find t,,,,t, and M.. 5) For values in (4), then plot transient response with these values.arrow_forwardQ2) A. A three phase half wave controlled rectifier shown in fig (1) with a delay angle a, the input voltages are specified as va=100 cos(wt), v = 100 cos(wt + 120°), vc = 100cos (wt-120°) 1) Draw the average output voltage for a = 0°,30° and 60°. 2) Draw the la, land i, for each a 3) Calculate the average output voltage for each a n Va Vs Th, * Thz D Th3 R لے E Loadarrow_forwardI hope the solution is on paper and not by artificial intelligencearrow_forward
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