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Extra Problems for Exam II
EE 313
Not to be turned in.
1.
For the following circuits, determine the loads required to get maximum power transfer.
Find the Thevenin equivalent circuit and attach the load.
What is the maximum real power
transferred?
2.
A system consists of a single 60 Hz source with a voltage of 100 V rms connected to 3 loads,
where:
Z
1
absorbs 3kW at 0.45 lagging, Z
2
absorbs 12
∠
80˚ kVA, and Z
3
absorbs 10kVAR
at 0.4 lagging.
a)
What are the load impedances and the load currents?
b) What is the total source current,
I
S
?
c)
What is the real power delivered by the source?
d) What is the complex power absorbed by the 3 loads combined?
e)
What is the power factor of the three loads combined?
f)
To increase the power factor to 0.95 lagging, without changing the real power delivered or
the source voltage, what must the component of the load be?
g) What is the maximum reduction in source current allowed using a single compensating load?
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You are given a balanced 3phase, balanced Y connected source connected to a balanced 3
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 Fall '09
 ENGLISH

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