Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 10RQ
What electronic component is often used to prevent large voltage spikes from being produced when the current flow through an inductor is suddenly terminated?
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Ex. Determine the safety factor for the bracket rod shown below for
N = 6 x 107 Cycles. The notch radius at the wall is Y=0.25 cm..
the braket is made from Aluminum 2024, Cold-drawn with σy, 290 MP
441 MPa.
L = 10 cm, a = 8 cm, d = 2cm.
"Out =
d
Wall
A
rod
arm
a
F
dynamically
Ex: A rectangular stepped bar is to be loaded in bending.
· Determin the fatigue stress concentration factor for a given
dimensions. Out = 324 MPa (steel)
M
d= 1.8 cm
2
D= 1 cm
r= 0.25 cm
Ex. Create an estimated S-N diagram for an aluminum bar and
define its equation
.
what is the corrected fatigue strength at
N = 2 #10 cycles ? Out = 310 MPa, the forged bar is 3.81 cm in
N=2107
round. The load is fully reversed torsion.
Chapter 2 Solutions
Electrical Transformers and Rotating Machines
Ch. 2 - What determines the polarity of magnetism when...Ch. 2 - What determines the strength of the magnetic field...Ch. 2 - Prob. 3RQCh. 2 - How many lines of magnetic flux must be cut in 1 s...Ch. 2 - Prob. 5RQCh. 2 - Into how many time constants is an exponential...Ch. 2 - Each time constant of an exponential curve is...Ch. 2 - An inductor has an inductance of 0.025 H and a...Ch. 2 - Prob. 9RQCh. 2 - What electronic component is often used to prevent...
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- and Ex. Create an estimation of S-N diagram for asteel, axially loaded bar and define its equation. How many cycles of life can be expected if the alternating stress is 100 MPa. The bar is 150 min has a hot-rolled finish. The operating temp. is 500 °C. out 600. MPa. The loading will be. pure axial, fully reversed. Square =arrow_forwardCreate an estimation of S-N diagram for asteet, axially loaded bar and define its equation. How many cycles of life can be expected if the alternating stress is 100 MPa. The bar is 150 mm has 9 The loading will be. pure axial, fully reversed. hot-rolled finish. The operating temp. is 500 °C. Out = 600 MPa. Square andarrow_forwardEx. Repeat Ex. in page (24), with fluctuating load as shown below. By = 462 M2, Out = 552 MPa. Find the safety factor (NF) using Modified - Goodman, Gerber, and soderberg criterias F(N) 400 100 timearrow_forward
- ut Ex. The cantilever beam shown is, made from steel with σ = 552 MPa is subjected to fully reversed load. Neglect shear stress q :10 cycles effect, estimate wheather the beam is safe or not safe at N= los The beam is machined surface and the operating temp. is 100c. D 764 L= 10cm L D= 1.3 Cm d = 1 cm b= 1 cm momend diagram -FLarrow_forwardEx. Design to Carry a Cylindrical thin pressure vessel with hemispherical ends for infinite life. Find the appropriate, thickness (t) of the vessel a sinusoidal pressure varied from (0) to (1 MPa). the vessel is made from steel 1030 hotrolled with out = 467.MP¬ and the operating temperature is 300 °C. The diameter of the cylinder D= 0.3 m . Using safety factor N = 2.arrow_forwardEx. Create an estimated S-N diagram for an aluminum bar and define its equation what is the corrected fatigue strength at 7 N = 2 * 10 cycles ? Out = 310 MPa, the forged bar is 3.81 cm in round. The load is fully reversed torsion.arrow_forward
- 1 Estimate the factor of safety fora ductile materail having by = 100 MPa, with the state of stress shown in the element. 30 MPa 12MPA zo M R HP. 1 12MP 30 MPa 20 MPa x '12 MPaarrow_forwardEx. Find the stress concentration factor of grooved shafts that loaded as shown , take 2=2, f = 0.15 j= T тв d a- _b_ _C-arrow_forwardEx. Determine the safety factors for the bracket rod based on the distortion "energy theory and max. shear theory both Given: L= 6 in held 47000 Psi and material is ductile. a = 8 in d = 1.5 in F = 7000-16 arm し Tod F a darrow_forward
- Ex. For a plate that made from a brittle material alloy shown below, Find the max. stress that occur. P=5KN d=2cm w= 10 cm t=0.2 cmarrow_forwardEx. A circular cantilever rod, shown in the Fig. below, is to be made * from al ductile material with field strength of 276 MPa Using design factor N = 2 factor N = 2, Find the appropriate diameter(d). d F= 1.75 KN P=9KN 120mmarrow_forwardEx. A circular rod, constructed of ductile material of tensile a "strength yd 300 MPa", is subjected to a torque T = 500 TE N.m. and axial tensile load "P. The diameter of the rod d= 50 mm •Using Tresca criterion with N=1.2, Find allowable P.arrow_forward
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