Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
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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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.
The 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?
The magnetization curve of a DC machine is linear.
True or False
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
- 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?arrow_forwardA 4 pole armature of a DC machine has 175 conductors and a flux per pole of 0.1 wb. Find the EMF generated when running at 600 rpm, when the armature is Lap wound.arrow_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_forward
- Calculate the torque developed by the armature of a 4 pole lap wound, dc machine having 728 active conductors and running at 1800rpm. The flux per pole is 30mWb and the armature is designed to carry a maximum line current of 100A. 347.7 N-m 48.2 N-m 72.4 N-m 26.4 N-marrow_forwardA dc machine has 4-pole, wave wound armature with 46 slots and 16 conductors per slot. If induced voltage in the armature is 480 V at 1,200 rpm, determine the flux per polearrow_forwardno more than 50 words. A self-excited DC generator has lost its residual magnetism and therefore cannot work (cannot build-up voltage), How would you restore this residual magnetism and make it work again?arrow_forward
- The total conductor of the direct current generator shown in the figure is 1440. The length of the armature is 30cm, the magnetic flux of a pole is 0.8 Tesla and the armature rotates at a speed of 4 m / s. Find the value of the voltage generated by the armature according to the position in the figure.arrow_forwardExplain how the magnetization curve is measured for a dc machine.arrow_forwardA self-excited DC generator has lost its residual magnetism and therefore cannot work (cannot build-up voltage), How would you restore this residual magnetism and make it work again?arrow_forward
- based on number 3 answer, what is the internally generated torque of the armature in N-m? (Answer in 2 decimal places)arrow_forwardSOLVE AND SHOW YPUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DE CIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. a) determine the frequency of the machine when running at 3600 rpm.arrow_forward8) Which part of the DC machine spread out the magnetic flux? a. Field Pole b. Commutator c. Armature d. Yokearrow_forward
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