Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 3, Problem 3.28P
Repeat Problem 3.8, but use ∇.D= pv and take an appropriate volume integral.
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EEE 316-Electr...chines | PQ..pdf
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Phoenix Files
4th September, 2023.
INSTRUCTIONS:
Answer FIVE (5) QUESTIONS,
DURATION: 3 HOURS
QUESTION ONE:
1a)
What is electromechanical energy conversion.
(3 Mark:
1b)
Explain the following terms: permanent magnets and non-permanent magnets
(5 Mark:
1c)
A short shunt generator delivers 45A at 240V and the resistance of the shunt field and armature:
500 and 0.030 respectively. Calculated the generated emf.
(6 Marks
QUESTION TWO:
2a)
2b)
Energy can never be created or destroyed", discuss with examples
Why is the air-gap very important in electromechanical systems.
(4 Marks
(4 Marks,
2c)
A short shunt generator delivers 450A at 240V and the resistance of the shunt field and armature
are 500 and 0.030 respectively. Calculated the generated emf.
(6Marks)
QUESTION THREE:
3a)
3b)
List and explain the two types of armature windings mostly used in DC machines.
Differentiate between electromechanical devices and machines with examples.…
2.
For the circuit shown, V = -10 V, R. = 10 kQ, R
Calculate the operating point for the circuit shown. Use /,
= 2.2 kQ, R = 3.6 kQ, R = 1 kQ.
//ẞ and calculate /. for ẞ = 90.
R1
m
R2
22
Rc
C
Vec
RE
HE
Pls show neat and whole solution
Chapter 3 Solutions
Engineering Electromagnetics
Ch. 3 - Prob. 3.1PCh. 3 - An electric field in space is E=(5z2/C0)azV/m....Ch. 3 - Consider an electric dipole in free space,...Ch. 3 - An electric field in free space is E=(5z3/0)z V/m....Ch. 3 - A volume charge distribution in free space is...Ch. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Use Gauss, law in integral form to show that an...Ch. 3 - A sphere of radius a free space contains charge of...Ch. 3 - An infinitely long cylindrical dielectric of...
Ch. 3 - Consider a cylindrical charge distribution having...Ch. 3 - The sun radiates a tota1 power of about 3.86...Ch. 3 - Spherical surfaces at r = 2, 4, and 6 m carry...Ch. 3 - Prob. 3.14PCh. 3 - Volume charge density is located as follows; pv=0...Ch. 3 - An electric flux density is given by D=D0aP, where...Ch. 3 - In a region having spherical symmetry, volume...Ch. 3 - State whether the divergence of the following...Ch. 3 - A spherical surface of radius 3 mm is centered at...Ch. 3 - A radial electric field distribution in free space...Ch. 3 - In a region exhibiting spherical symmetry,...Ch. 3 - (a) A flux density field is given as F1 = 5 az....Ch. 3 - (a) A point charge Q lies at the origin. Show that...Ch. 3 - In a region in free space, electric flux density...Ch. 3 - Within the spherical shell, 3D= 5(r-3)3a,C/m2 .(a)...Ch. 3 - If we have a perfect gas of mass density Px...Ch. 3 - Consider a slab of material containing a volume...Ch. 3 - Repeat Problem 3.8, but use .D= pv and take an...Ch. 3 - Prob. 3.29PCh. 3 - (a) Use Maxwells first equation. �. D=Pv, to...Ch. 3 - Prob. 3.31P
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- Pls show neat and whole solutionarrow_forwardA. A dc chopper with a free-wheeling diode feeds a dc motor with an armature inductance of 15 mH and resistance of 12. The dc source voltage is 200 V. The ON time and OFF time are 2 ms and 0.5 ms respectively. Determine the armature current when the back Emf of the motor is 155 V. Also draw the power circuitry.arrow_forwardAn inductive load is controlled by an impulse commutation chopper in Fig.1 and peak load current IL-450A at a supply voltage of 220V. The chopping frequency f=275 Hz, commutation capacitor C=60μF and reversing inductance Lm=20μH.The source inductance Ls 8μH, determine: td tc tr=tc+td a) peak Capacitor discharge Current. b) Circuit turn off time. c) Commutation time. d) The maximum instantaneous capacitor voltage. Vects = Vs+ IL LS sin ust Ls 000002 a C T₁ IL T₂ FWD ic oooooL L D₁ fig1 LOAD Vo Iarrow_forward
- An inductive load is controlled by an impulse commutation chopper in Fig.1 and peak load current IL-450A at a supply voltage of 220V. The chopping frequency f=275 Hz, commutation capacitor C=60μF and reversing inductance Lm=20μH.The source inductance Ls=8μH, determine : td tc tr=tc+td a) peak Capacitor discharge Current. b) Circuit turn off time. c) Commutation time. d) The maximum instantaneous capacitor voltage. Vects = Vs+ ILLS Ls 000002 a C ic T₁ iTI IL T₂ FWD LOAD Vo oooooL L D₁ fig1 Iarrow_forwardA. A dc chopper with a free-wheeling diode feeds a dc motor with an armature inductance of 15 mH and resistance of 10. The dc source voltage is 200 V. The ON time and OFF time are 2 ms and 0.5 ms respectively. Determine the armature current when the back Emf of the motor is 155 V. Also draw the power circuitry. 100arrow_forward1. For the circuit shown, VBB = +10 V, Vcc = +30 V, RB = 470 kQ, Rc = 6 kQ. Calculate the operating point for the circuit shown for a ẞ value of 90 and for a ẞ value of 130. VBB RB w Rc Vccarrow_forward
- The circuit in the figure below has been left for a long time. Determine the current i.arrow_forwardDraw and explain the electronic circuit diagram of ON/OFF controller. Write its advantagesand disadvantages.arrow_forwardThe expected value of the vyoltage across a resistor is 545 V However, measurement yields avalue o 500 V. Calculate: a) Absolute error b) Percentage error c) Absolute accuracy d) Relative accuracy.arrow_forward
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