Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 1, Problem 3RQ
The south pole of one magnet is brought close to the south pole of another magnet. Will the magnets repel or attract each other?
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How should the permeability and number of ampere turns for good magnetic materials be?
a) high permeability, high ampere turns
b) high permeability, low ampere turns
c) low permeability, low ampere turns
d) low permeability, high ampere turns
2. Explain the magnetic classification of materials
Assume the stator and rotor magnetic fields of a motor, “BS” and “BR,” are in x-y plan.
If the angle from the vector BS to BR is 30o, measured counterclockwise, what would be the direction of the resulting induced torque?
A.
Along the +z axis
B.
Along the -z axis
C.
counterclockwise
D.
In the x-y plane
E.
clockwise
Chapter 1 Solutions
Electrical Transformers and Rotating Machines
Ch. 1 - Is the north magnetic pole of the earth a north...Ch. 1 - What were early natural magnets known as?
Ch. 1 - The south pole of one magnet is brought close to...Ch. 1 - How can the polarity of an electromagnet be...Ch. 1 - Define the following terms:
Flux...Ch. 1 - A force of 1 ounce is equal to how many dynes?
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Is the north magnetic pole of the earth a north polarity or a south polarity?arrow_forwardDefine the following terms: Flux density Permeability Reluctance Saturation Coercive force Residual magnetismarrow_forwardDC and AC Subject: Find the relative permeability of the typical ferromagnetic material whose magnetization curve is shown. H = 50, 100, 500 and 1000 A-turns/m. Answer these: H = 100, 500, and 1000 A-turns/narrow_forward
- True or False? The strength of the magnetic field in an electromagnet increases with an increase in the number of turns of wire and the current flowing through them.arrow_forwardHow much voltage is produced by a silicon solar cell?arrow_forwardAssume that a primary current of 75 amperes flows through the windings of the transformer in question 4. How much current will flow in the secondary winding?arrow_forward
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Ch 2 - 2.2.2 Forced Undamped Oscillation; Author: Benjamin Drew;https://www.youtube.com/watch?v=6Tb7Rx-bCWE;License: Standard youtube license