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 7.33P
Use an expansion in rectangular coordinates to show that the curl of the gradient of any scalar field G is identically equal to zero.
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EEE 316-Electr...chines | PQ..pdf
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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:
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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
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C
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RE
HE
Pls show neat and whole solution
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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- 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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Gradient of a scalar field | Lecture 17 | Vector Calculus for Engineers; Author: Jeffrey Chasnov;https://www.youtube.com/watch?v=W8N8XswNei8;License: Standard Youtube License