Fundamentals of Materials Science and Engineering, Binder Ready Version: An Integrated Approach
5th Edition
ISBN: 9781119175483
Author: William D. Callister Jr., David G. Rethwisch
Publisher: WILEY
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Chapter 15.16, Problem 16QP
To determine
The volume fraction of fibers.
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a) An iron ring, having a mean circumference of 250 mm and a cross-sectional area of 400
mm², is wound with a coil of 70 turns. Using the following data, calculate the current
required to set up a flux of 510µWb in the ring.
H (A/m) 350
600
1250
B (T)
1.0
1.2
1.4
b) Calculate also:
i. The inductance of the coil at the current obtained in Question 2 (a) above.
ii. The self-induced e.m.f. if this current is switched off in 0.005 s. Assume that there
is no residual flux.
A balanced three-phase, 1351-V, 60-Hz, A-connected source feeds a balanced Y-
connected load with a per-phase impedance of 360 + j150 Q as shown in Figure 1.
Calculate:
i. The readings on each of the wattmeters
ii. The power factor of the load using the wattmeter readings.
NOTE:
i.
ii.
Let VAN be the reference phasor, and the phase sequence be ABC
anticlockwise.
Assume the voltage-drop on the conductors between the source and the load
to be zero volts.
V b
V₁
W
000
000 ;
A
360 + j150
360 + j150
4
b
0000
000
B
360 + j150
C
W₂
Figure 1
a) Three 30 2 resistors are arranged as shown in Figure 1 below. They are connected to
a 480 V three-phase supply. The phase sequence is RYB anticlockwise. Calculate:
i. The total power drawn by the circuit using the phase parameters.
ii.
The power read by each wattmeter.
b) If Za, one of the 30 2 resistors, is now removed from the circuit, calculate:
R-
i.
The line currents: IR, Iv, and la
ii.
The power read by each wattmeter.
iii.
The total power drawn by the two resistors.
W₁
Be-
W2
www
'R
22
12
B
Figure 1
Chapter 15 Solutions
Fundamentals of Materials Science and Engineering, Binder Ready Version: An Integrated Approach
Ch. 15.16 - Prob. 1QPCh. 15.16 - Prob. 2QPCh. 15.16 - Prob. 3QPCh. 15.16 - Prob. 4QPCh. 15.16 - Prob. 5QPCh. 15.16 - Prob. 6QPCh. 15.16 - Prob. 7QPCh. 15.16 - Prob. 8QPCh. 15.16 - Prob. 9QPCh. 15.16 - Prob. 10QP
Ch. 15.16 - Prob. 11QPCh. 15.16 - Prob. 12QPCh. 15.16 - Prob. 13QPCh. 15.16 - Prob. 14QPCh. 15.16 - Prob. 15QPCh. 15.16 - Prob. 16QPCh. 15.16 - Prob. 17QPCh. 15.16 - Prob. 18QPCh. 15.16 - Prob. 19QPCh. 15.16 - Prob. 20QPCh. 15.16 - Prob. 21QPCh. 15.16 - Prob. 22QPCh. 15.16 - Prob. 23QPCh. 15.16 - Prob. 24QPCh. 15.16 - Prob. 25QPCh. 15.16 - Prob. 26QPCh. 15.16 - Prob. 27QPCh. 15.16 - Prob. 28QPCh. 15.16 - Prob. 29QPCh. 15.16 - Prob. 30QPCh. 15.16 - Prob. 2DPCh. 15.16 - Prob. 3DPCh. 15.16 - Prob. 4DPCh. 15.16 - Prob. 5DPCh. 15.16 - Prob. 6DPCh. 15.16 - Prob. 1FEQPCh. 15.16 - Prob. 2FEQPCh. 15.16 - Prob. 3FEQPCh. 15.16 - Prob. 4FEQP
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