Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Chapter 7, Problem 7.42P
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Q2.
22
A four-pole, 415 V 50Hz induction motor supplies its rated power to a
constant load. The rated speed of the motor is 1470 rpm.
i) Draw the equivalent electrical circuit of the motor
ii) Calculate the slip frequency and slip
iii) If the supply voltage is changed to 207.5 V_25 Hz, calculate the motor
speed, slip frequency, and slip.
iv) Sketch torque-speed characteristics of the motor when the supply
voltages are 415 V 50 Hz, 207.5 V_25 Hz and 415 V_60 Hz
respectively; Compare the peak torques of the 415 V_50 Hz case and
the 415 V_60 Hz case.
b) A synchronous generator connects to an infinite bus. The terminal voltage
VT and output current IA of the generator are shown in the phasor diagram
in Figure Q2. This generator is required to double its real power output by
increasing the governor's set point while maintaining the field current. With
the aid of the phasor diagram, analyse the effect of the change of
governor's set points on the internal generated voltage EA, the output…
The figure below shows a 50Hz balanced star-star three-phase circuit with line loss. The load impedance Z = 40 + j15.08 Ω.(a)Calculate the line load impedance ZL.(b)Determine the average power:(i)Delivered by the three-phase source.(ii)Delivered to the three-phase load.(iii)Absorbed by the three-phase line.(c)Calculate the power efficiency of the system.
Three concentric spherical shells 7=1, 7=2, 7=3 m, respectively, have
charge distriutions 2, 4 and 5 μC/m².
(a) Calculate the flux through 7=1.5 m² and r = 2.5m.
(b) Find D at 7=0.5m, r=2.5m, and r=3.5m .
Chapter 7 Solutions
Engineering Electromagnetics
Ch. 7 - Find H in rectangular components at P(2,3,4) if...Ch. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - The parallel filamentary conductors shown in...Ch. 7 - A disk of radius a lies in the xy plane, with z...Ch. 7 - Prob. 7.7PCh. 7 - For the finite-length current element on the z...Ch. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - A solenoid of radius a and of length. L is...Ch. 7 - Prob. 7.12PCh. 7 - Prob. 7.13PCh. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - A current filament carrying I in the -az direction...Ch. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - A solid conductor of circular cross section with a...Ch. 7 - Prob. 7.21PCh. 7 - Prob. 7.22PCh. 7 - Prob. 7.23PCh. 7 - Prob. 7.24PCh. 7 - Prob. 7.25PCh. 7 - Prob. 7.26PCh. 7 - The magnetic field intensity is given in a certain...Ch. 7 - Given H=(3r2/sin)a+54rcosa A/m in free space: (a)...Ch. 7 - Prob. 7.29PCh. 7 - Prob. 7.30PCh. 7 - Prob. 7.31PCh. 7 - Prob. 7.32PCh. 7 - Use an expansion in rectangular coordinates to...Ch. 7 - A filamentary conductor on the z axis carries a...Ch. 7 - A current sheet K = 20 az A/m, is located at p =...Ch. 7 - Let A= (3y-z)ax+2xzayWb/m in a certain regin of...Ch. 7 - Let/N=1000, I=.08 A, p0=2 cm and a=.08 cm for the...Ch. 7 - A square filamentary differential current loop, dL...Ch. 7 - Prob. 7.39PCh. 7 - Show that the line integral of the vector...Ch. 7 - Prob. 7.41PCh. 7 - Show that 2(1/R12)=1(1/R12)=R21/R312.Ch. 7 - Compute the vector magnetic potential within the...Ch. 7 - Prob. 7.44P
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- Three concentric spherical shells 7=1, 7=2, 7=3 m, respectively, have charge distriutions 2, 4 and 5 µC/m². (a) Calculate the flux through 7=1.5m and r = 2.5 m. (b) Find D at 7=0.5m, r=2.5m, and 7= 3.5m.arrow_forwardim not sure this answer makes sense to me. The question is "Between which terminal block and screw numbers is relay coil CR-7 located?" The answer points towards lines in a seperate text? My answer was "TB-5B between screw numbers 2 & 10" could someone please review this and let me know if I am correct? (This is not for a graded assignment, It is not worth any marks and my professor has not released any answer keys)arrow_forwardNeed Handwritten solution do not use chatgpt or AIarrow_forward
- The figure below shows a 60-Hz balanced star-star three-phase circuit.(a) For the equivalent circuits of the load impedance Z shown in (ii), calculate the load impedance Z, the line current IA, the power factor, and the total average power delivered to the three-phase load.(b) The power factor is corrected to 1.00 by inserting a capacitance in parallel to the resistive and inductive load as shown in (iii). Determine the capacitance value C.arrow_forwardFor a series resonant circuit with the following specifications:1. A resonant frequency fn = 4.5kHz.2. A bandwidth BW = 150Hz3. A peak current Imax = 100mA at resonance.(a) Find the values of the quality factor, the resistance, the inductance, and the capacitance.(b) Calculate the power consumed and energy stored at the resonance.(c) Determine the inductance and capacitance required to reduce the bandwidth of the resonant circuit to 70 Hz without changing the resonant frequency or peak current.arrow_forwardFor a series resonant circuit with the following specifications:1. A resonant frequency fn = 4.5kHz.2. A bandwidth BW = 150Hz3. A peak current Imax = 100mA at resonance.(a) Find the values of the quality factor, the resistance, the inductance, and the capacitance Assiming V=5<0o.(b) Calculate the power consumed and energy stored at the resonance.(c) Determine the inductance and capacitance required to reduce the bandwidth of the resonant circuit to 70 Hz without changing the resonant frequency or peak current.arrow_forward
- . Apply the divergence theorem to evaluate A ds, where A = x²a¸ + y²a, + z²a, and S is the surface of the solid bounded by the cylinder p = 1 and planes z = 2 and z = 4. Sarrow_forwardDon't use ai to answer I will report you answerarrow_forwardThe figure below shows a 60-Hz balanced star-star three-phase circuit.(a) For the equivalent circuits of the load impedance Z shown in (ii), calculate the load impedance Z, the line current IA, the power factor, and the total average power delivered to the three-phase load.(b) The power factor is corrected to 1.00 by inserting a capacitance in parallel to the resistive and inductive load as shown in (iii). Determine the capacitance value C.arrow_forward
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