# Circuit Theorems In Ac Analysis

• ## 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.

• A. True
• B. False
Explanation:

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• ## The Norton equivalent current is_____.

• A. The current through the load
• B. The open-current from the source
• C. The short circuit current
• D. None of the above
Explanation:

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• ## For the given circuit, find VTH 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
Explanation:

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• ## Norton’s theorem gives_____.

• A. An equivalent current source in parallel with an equivalent impedance
• B. An equivalent current source in series with an equivalent impedance
• C. An equivalent voltage source in parallel with an equivalent impedance
• D. An equivalent voltage source in series with an equivalent impedance
Explanation:

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• ## Referring to the given circuit, what is VTH 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
Explanation:

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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
Explanation:

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• ## Referring to the given circuit, find ZTH for the part of the circuit that is external to RL. • A. 129 ∠21.4° Ω
• B. 43.7 ∠68.6° Ω
• C. 43.7 ∠21.4° Ω
• D. 12.9 ∠68.6° Ω
Explanation:

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• ## Norton’s theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.

• A. True
• B. False
Explanation:

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• ## Determine VTH 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
Explanation:

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• ## Referring to the given circuit, what is ZTH if R1 is changed to 220 Ω? • A. 225 ∠12.1° Ω
• B. 225 ∠77.9° Ω
• C. 46 ∠77.9° Ω
• D. 46 ∠12.1° Ω