MATERIALS SCI.+ENGR.:INTRO.-NEXTGEN
10th Edition
ISBN: 9781119503941
Author: Callister
Publisher: WILEY
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Chapter 3, Problem 20QAP
To determine
The volume of the unit cell for Rhenium.
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Derive the component transformation equations for tensors shown below where [C] = [BA] is the DCM (direction cosine matrix) from frame A to B.
^B [T] = [C]^A [T] [C]^T
With the aid of a phasor diagram show that the active
power and power factor of a balanced three-phase load
can be measured by two wattmeters.
For a certain load, one wattmeter indicated 20 kW
and the other 5 kW after the voltage circuit of this
wattmeter had been reversed. Calculate the active
power and the power factor of the load.
ANS:
15 kW, 0.327
State the advantages to be gained by raising the power
factor of industrial loads.
A 400 V, 50 Hz, three-phase motor takes a line
current of 15.0 A when operating at a lagging power
factor of 0.65. When a capacitor bank is connected
across the motor terminals, the line current is reduced
to 11.5 A. Calculate the rating (in kVA) and the capa
citance per phase of the capacitor bank for: (a) star
connection; (b) delta connection. Find also the new
overall power factor.
ANS:
3.81 kvar, 70.5 µF, 23.5 µF, 0.848 lagging
Chapter 3 Solutions
MATERIALS SCI.+ENGR.:INTRO.-NEXTGEN
Ch. 3 - Prob. 1QAPCh. 3 - Prob. 2QAPCh. 3 - Prob. 3QAPCh. 3 - Prob. 4QAPCh. 3 - Prob. 5QAPCh. 3 - Prob. 6QAPCh. 3 - Prob. 7QAPCh. 3 - Prob. 8QAPCh. 3 - Prob. 9QAPCh. 3 - Prob. 10QAP
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