Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 39, Problem 13SQ
To determine
Choose the correct option to find the location where the DC excitation is applied.
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In a certain medium with μo, & =
H 12e
480
y sin (x x 10% By) a, A/m
find: (a) the wave period T, (b) the wavelength A, (c) the electric field E, (d) the phase
difference between E and H.
A plane wave propagating through a medium with ɛ, = 8, μ, 2 has E = 0.5
e-3 sin(108tẞz) a, V/m. Determine
(a) B
(b) The loss tangent
(c) Wave impedance
(d) Wave velocity
(e) H field
Answer: (a) 1.374 rad/m, (b) 0.5154, (c) 177.72 /13.63° 2, (d) 7.278 × 107 m/s,
(e) 2.817e3sin(108 - Bz - 13.63°)a, mA/m.
In a nonmagnetic medium,
E = 50 cos (10% - 8x) a, + 40 sin (10't - 8x) a, V/m
find the dielectric constant &, and the corresponding H.
Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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- A uniform plane wave in air with E = 8 cos (wt 4x - 3z) a, V/m is incident on a dielectric slab (z0) with pr = 1.0, 8, = 2.5, σ = 0. Find (a) The polarization of the wave (b) The angle of incidence (c) The reflected E field (d) The transmitted H fieldarrow_forwardA plane wave in a nonmagnetic medium has E = 50 sin (10% + 2z) a, V/m. Find (a) The direction of wave propagation (b) λ, f, and ε, (c) H Answer: (a) along -z direction, (b) 3.142 m, 15.92 MHz, 36, (c) 0.7958 sin(10% + 2z) a A/m.arrow_forwardThe magnetic field component of a plane wave in a lossless dielectric is = (a) If μ, 1, find ε,. H = 30 sin (2 × 10 - 5x) a, mA/m (b) Calculate the wavelength and wave velocity. (c) Determine the wave impedance. (d) Determine the polarization of the wave. (e) Find the corresponding electric field component. (f) Find the displacement current density.arrow_forward
- D8.2. The field B = -2ax + 3ay + 4a, mT is present in free space. Find the vector force exerted on a straight wire carrying 12 A in the aAB direction, given A(1, 1, 1) and: (a) B(2, 1, 1); (b) B(3, 5, 6). Ans. -48ay +36a, mN; 12ax - 216ay + 168az mNarrow_forward3 In a certain medium If μ = - E = 10 cos (2 x 10't ẞx)(a, + a.) V/m 50μo, ε = 28, and σ 0, find ẞ and H.arrow_forwardA plane wave propagating through a medium with &,,-8 μr = 2 nas: E = 0.5 e-j0.33z sin (108 t - Bz) ax V/m. Determine (a) ẞ (b) The loss tangent (c) Wave impedance (d) Wave velocity (e) H fieldarrow_forward
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