Materials Science And Engineering
10th Edition
ISBN: 9781119405498
Author: Callister, William D., Jr, RETHWISCH, David G., Jr., 1940- Author.
Publisher: Wiley,
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Two loads connected in parallel are respectively 2 kW at a pf of 0.75 leading and 4 kW at a
pf of 0.95 lagging. Calculate the pf of the combined two loads. Find the complex power
supplied by the source.
Hints:
•
•
Since the two loads are parallel, the complex power, S, supplied by the source is
S = S₁+ S₂
Calculate the complex powers, S₁ and S2, of each load (use power triangles) and add
them to find the total S.
Calculate 0 and obtain pf.
A 3-phase, 20-pole induction motor is con-
nected to a 600 V, 60 Hz source.
a. What is the synchronous speed?
b. If the voltage is reduced to 300 V, will
the synchronous speed change?
c. How many groups are there, per
phase?
Describe the principle operation of PEMFC, and role of membrane electrode assembly (MEA).
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