Referring to the given circuit, what is V
TH if VS = 12 ∠0° V?
A. 4.69 ∠38.7° V
B. 9.38 ∠38.7° V
C. 12 ∠0° V
D. 6 ∠0° V
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Referring to the given circuit, find Z
TH if VS is 180° V.
A. 9.82 ∠-51.3° kΩ
B. 9.38 ∠-51.3° kΩ
C. 180 ∠-38.3° kΩ
D. 19.2 ∠-38.3° kΩ
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Determine V
TH when R1 is 180 Ω and XL is 90 Ω.
A. 135∠63.4° V
B. 13.5∠63.4° V
C. 12.2∠0° V
D. 122∠0° V
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The two basic components of a Thevenin equivalent ac circuit are
A. The equivalent voltage source and the equivalent series impedance
B. The equivalent voltage source and the equivalent series resistance
C. The equivalent voltage source and the equivalent parallel impedance
D. The equivalent voltage source and the equivalent parallel resistance
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One circuit is equivalent to another, in the context of Thevenin's theorem, when the circuits produce the same voltage.
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For the given circuit, find V
TH for the circuit external to RL.
A. 4.69 ∠51.3° V
B. 4.69 ∠38.7° V
C. 469 ∠38.7° mV
D. 6 ∠0° V
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Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.
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The superposition theorem is useful for the analysis of single-source circuits.
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Referring to the given circuit, L
A. Must be in parallel with RL
B. Must be placed in parallel with VS
C. Must have a reactance equal to XC
D. Has no effect on the result
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In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.
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In order to get maximum power transfer from a capacitive source, the load must have an impedance that is the complex conjugate of the source impedance.
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Determine V
TH for the circuit external to RL in the given figure.
A. 135 ∠63.4° V
B. 13.5 ∠63.4° V
C. 13.5 ∠0° V
D. 135 ∠0° V
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An equivalent circuit is one that produces the same voltage and current to a given load as the original circuit that it replaces.
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A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.
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Referring to the given circuit, find Z
TH if R is 15 kΩ and RL is 38 kΩ.
A. 89.82 ∠-51.3° kΩ
B. 19.2 ∠-38.3° kΩ
C. 9.38 ∠-51.3° kΩ
D. 180 ∠-38.3° kΩ
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For the circuit given, determine the Thevenin voltage as seen by RL.
A. 0.574 ∠16.7° V
B. 5.74 ∠16.7° V
C. 0.574 ∠-16.7° V
D. 5.74 ∠-16.7° V
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Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure.
A. 1,027 Hz
B. 10,270 Hz
C. 6,330 Hz
D. 63,330 Hz
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The superposition theorem is useful for circuit analysis only in ac circuits.
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In order to get maximum power transfer from a capacitive source, the load must
A. Have a capacitive reactance equal to circuit resistance
B. Have an impedance that is the complex conjugate of the source impedance
C. Be as capacitive as it is inductive
D. None of the above
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In applying the superposition theorem,
A. The sources are considered one at a time with all others replaced by their internal impedance
B. All sources are considered independently
C. All sources are considered simultaneously
D. The sources are considered one at a time with all others replaced by their internal resistance
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