Earth Is the Lords
5th Edition
ISBN: 9781121660069
Author: Caldwell, Taylor
Publisher: MCG/CREATE
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Textbook Question
Chapter 1, Problem 1.3Q
What is magnetizing intensity? What is magnetic flux density? How are they related?
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Chapter 1 Solutions
Earth Is the Lords
Ch. 1 - What is torque? What role does torque play in the...Ch. 1 - What is Amperes law?Ch. 1 - What is magnetizing intensity? What is magnetic...Ch. 1 - How does the magnetic circuit concept aid in the...Ch. 1 - What is reluctance?Ch. 1 - What is a ferromagnetic material? Why is the...Ch. 1 - How does the relative permeability of a...Ch. 1 - Prob. 1.8QCh. 1 - What are eddy current losses? What can be done to...Ch. 1 - Why are all cores exposed to ac flux variations...
Ch. 1 - What is Faraday law?Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - Prob. 1.14QCh. 1 - The linear machine in Figure 1-19 is running at...Ch. 1 - Just how does a decrease in flux produce an...Ch. 1 - Will current be leading or lagging voltage in an...Ch. 1 - What are real, reactive, and apparent power? What...Ch. 1 - What is power factor?Ch. 1 - Prob. 1.1PCh. 1 - A flywheel with a moment of inertia of 4kgm2 is...Ch. 1 - A force of 10 N is applied to a cylinder of radius...Ch. 1 - A motor is supplying 50Nm of torque to its load....Ch. 1 - A ferromagnetic core is shown in Figure P1-2. The...Ch. 1 - A ferromagnetic core with a relative permeability...Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A core with three legs is shown in Figure P1-5....Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A wire is shown in Figure P1-7 that is moving in...Ch. 1 - Repeat Problem 1-10 for the wire in Figure P1-8.Ch. 1 - Prob. 1.12PCh. 1 - A core with three legs is shown in Figure P1-10....Ch. 1 - A two-legged magnetic core with an air gap is...Ch. 1 - A transformer core with an effective mean path...Ch. 1 - The core shown in Figure P1-2 has the flux shown...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Demonstrate that Equation (1-59) can be derived...Ch. 1 - Prob. 1.21PCh. 1 - Prob. 1.22PCh. 1 - For the linear machine of Problem 1-22: When this...
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- Answer the following a. How does the relative permeability of a ferromagnetic material vary with magnetomotive force? b. How does a decrease in flux produce an increase in speed in a linear machine? c. Will current be leading or lagging voltage in an inductive load? Will the reactive power of the load be positive or negative? Explain in detail.arrow_forwardAlso explain what is magneto motive force???arrow_forwardThe magnetization curve of a DC machine is linear. True or Falsearrow_forward
- Q1: Start from first principles to prove that: "For a fixed flux density, the volume of the ferromagnetic core is directly proportional to the energy stored in the magnetic field".arrow_forwardA magnetic pole face has a rectangular section having dimensions 200 mm by 100 mm. If the total flux emerging from the pole is 150 µWb. a) If the emerging flux of the pole is changed to 100µWb what will be the resultant density?c) When the dimensions of the magnetic pole are changed to 10m and 5m what will be the new density?d) What would happen if the magnetic pole is changed to square?arrow_forwardExplain why do we need a B-H curve when we solve a parallel magnetic circuit in which one of the fluxes is give?arrow_forward
- A) Which of the following is/are a factor that will determine the amount of emf generated by a generator? a) number of armature conductors b) number of lines of flux (flux density) c) the speed at which the conductors are cutting the lines of flux (rate of incidence) d) all of the above B) Of all the factors which influence the amount of voltage generated by a generator, fi-om a field technicians standpoint, which one is most easily varied? a) rate of incidence b) flux density c) number of conductors on the armature d) none of the abovearrow_forwardState Ampere's circuital law. Hence find the expression for the magnetic field strength ( B ) of a long current carrying solenoid.arrow_forward30. A) Why is there a small emf generated in a series generator at no load? a) the residual magnetic field establishes a low density magnetic field which the armature conductors cut b) the series field does not contribute any magnetic strength, because the field strength is a product of Ampere-Turns and there is no current through the series field with no load c) the amount of emf generated in a series generator is directly proportional to the load current d) all of the above B) What happens to the generated emf as load is added? a) voltage should increase provided the field is connected in the correct polarity b) voltage should decrease regardless of the field connection polarity c) either "a" or "b" d) neither "a" nor "b"arrow_forward
- B) Of all the factors which influence the amount of voltage generated by a generator, fi-om a field technicians standpoint, which one is most easily varied?a) rate of incidence b) flux density c) number of conductors on the armature d) none of the abovearrow_forwardAnswer the following questions using formulas, figures, and diagrams.(a) What is coenergy in magnetic circuits?(b) How to calculate iron losses using BH curve in magnetic circuits?arrow_forwardFrom a technicians standpoint, how is the stregth of an electromagnet typically varied? a) by varying the number of turns, b) by varying the current flow, C) by barying the core is permeability, d) none A bar of iron said to be saturated once most of its magnetic molecules are aligned whereby increases in magnetomotives force results in smaller and smaller increases in flux in the core. A) true, B) false which of the folloeing is?are tupe of AC genator construction. A) revolving field desing, B) stationary field desing, C) both a and b, D) nonearrow_forward
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