Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 1, Problem 1.16Q
Just how does a decrease in flux produce an increase in speed in a linear machine?
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Chapter 1 Solutions
Electric machinery fundamentals
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardThe hysteresis and eddy current losses of a DC Machine running at 1000 rpm are 250 watts and 100 watts, respectively. If the flux remains constant, at what speed will the total iron loss be halved?arrow_forwardThe magnetization curve of a DC machine is linear. True or Falsearrow_forward
- A separately-excited dc generator develops 288 volts at a certain flux and at a certain speed. What should be the new generated voltage in volts for this machine if the speed is changed to 85 % of the original value and the flux is increased by 67 % from the original value?arrow_forwardKindly solve what is ask with complete solution so that I can understand. I want a handwritten solution. Thank you very much pois!!arrow_forwardThe eddy current loss in a DC machine is 600 watts when the total flux is 2, 000, 000 maxwell per pole and the machine is running at 1000 rpm. Determine the loss when the excitation of the machine is adjusted to produce 2, 500, 000 maxwell per pole and the speed is increased to 1200 rpm.arrow_forward
- An 8-pole DC machine has a simplex wave-wound armature containing 200 coils of 10 turns each. The resistance of each turn is 0.01 Ω. The flux per pole is 0.004 Wb. What is the internal resistance of the armature in ohms? What is the current absorbed by this machine in amperes at the instant it's connected to a 100 Vdc source? What is the internally generated torque produced by the armature of this machine in N-m at the instant it's connected to the 100 Vdc source? With the DC machine connected to the 100 Vdc source, what is the steady state angular speed of the machine in rpm? What is the internally generated voltage of the armature of this machine at steady state in volts?arrow_forwardThe interpoles in DC machines are: O a. Used to maintain constant magnetic flux O b. Used to increase the cost of the machine O c. Used to maintain the speed of rotation O d. Used to reduce the sparksarrow_forwardThe torque in AC machines depends on Select one: a. The strength of the rotor magnetic field b.The strength of the external magnetic field c.The sin of the angle between the rotor magnetic field and the external magnetic field d.A constant representing the construction of the machine e.All of above Clear my choicearrow_forward
- Mechanical losses represent: A. Windage losses O B. None of the other choices are correct O. Losses due to magnetization and demagnetization of the core O D. Resistive losses in the windings of the machine O E. Losses due to friction of the moving partsarrow_forwardAn 4 pole, wave connected armature has 520 conductors and its generated e.m.f is 115 V. If the machine is driven at 600 rpm, then the flux per pole in Wb isarrow_forwardQ3. A 4-pole machine has an armature with 90 slots and 8 conductors per slot, the flux per pole is 0.05 Wb and runs at 1,200 rpm. Determine induced emf if winding is (i) lap connected and (ii) wave connected. (Ans. 720 V, 1440 V) hee 400 ful fluy of 0 05 W/h Whet uarrow_forward
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Working Principle of DC Motor (animation of elementary model); Author: chrvoje engineering;https://www.youtube.com/watch?v=j_F4limaHYI;License: Standard Youtube License