Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 1, Problem 1.1P
To determine
The shaft speed in radians per second.
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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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- A separately excited dc generator generates 230 V when driven at 1200 rpm of the field flux is decreased by 10%. What is the new emf with speed remains the same.arrow_forwardWhat speed (in rpm) must a two-pole rotor rotate at to produce 50HZ AC?arrow_forwardThe speed of rotation of the magnetic field for a three-phase 4-pole AC machine is 3600 rev/min. If you would like to reduce the rotation of the speed to 188.4 rad/sec what should be the number of poles in the new design? Take = 3.14 Answer:arrow_forward
- A DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V min/Wb. What is most nearly the motor's developed torque? 28.65 n-m 50.3 n-m O 4,73 n-m O 11.70 n-marrow_forwardShunt generator running at 2000 rpm, if flux is reduced by half, then * what is the new speed 1000 r.p.m O 3000 r.p.m O 4000 r.p.m O 2000 r.p.m Oarrow_forwardIf a voltage with RMS values of 220 and freq of 60 Hz is applied to a coil with 250 turns, find maximum flux? ( 1500, L = 50 cm, and A = 15 CM², perhaps it is fr a rainy day and temperature is 75!) = 0.0333 3.333 0.333 0.0033arrow_forward
- A four pole machines generates 250V when operated at 1500 rpm. If the flux per pole is 1.85 x 106 maxwell, the number of armature slots is 45 and the armature winding has two parallel paths. If the speed of the generator is reduced to 1350 rpm, what would be the generated voltage. To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same at 250Varrow_forwardA basic one-loop dc generator is rotated at 60 rps. How many times each second does the dc output voltage peak (reach a maximum)?arrow_forwardWhen generator is being driven at 1200 rpm, the generated emf is 230V. What is the generated emf if the field flux is decreased by 10% with the speed remain unchanged?arrow_forward
- QUESTION 6 A DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V min/Wb. What is most nearly the motor's developed torque? 28.65 n-m 50.3 n-m 4,73 n-m O 11.70 n-marrow_forwardA magnetic coil produces 100,000 maxwell with 2000 turns and with a current of a 2A. The current is cut-off and the flux collapse in 0.01 sec. What is the average voltage that will appear across the coil?arrow_forwardWhy do motors have gaps or breaks throughout the rotor and commutator? It makes the motor cheaper since not as much material is needed. Only some sections of the rotor will act as electromagnets, causing the rotor to always be pushed in the same direction. It allows some of the magnetic field to escape so that rotor doesn't get too stressed. It lets air into the motor to keep it cool since the electricity can make it hot. It happens when rotors don't use enough oil, so they crack.arrow_forward
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