Circuit Theorems In Ac Analysis MCQ

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• Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS? <br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018851-16.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  226 mW

  খ

  2.26 mW

  গ

  4.24 mW

  ঘ

  424 mW
• For the circuit shown, determine Z_TH for the portion of the circuit external to RL. <br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018834-26.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  66.7 ∠-33.7° kΩ

  খ

  6.67 ∠-333.7° kΩ

  গ

  14.4 ∠-56.3° kΩ

  ঘ

  1.44 ∠-33.7° kΩ
• Referring to the given circuit, find Z_TH for the part of the circuit that is external to RL.<br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018808-30.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  129 ∠21.4° Ω

  খ

  43.7 ∠68.6° Ω

  গ

  43.7 ∠21.4° Ω

  ঘ

  12.9 ∠68.6° Ω
• Referring to the given circuit, determine Z_TH as seen by RL.<br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018783-18.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  1444 ∠-48.5° Ω

  খ

  4176 ∠-73.3° Ω

  গ

  956 ∠-48.5° Ω

  ঘ

  1444 ∠-73.3° Ω
• Referring to the given figure, determine Z_TH as seen by RL if R1 is changed to 3.3 kΩ.<br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018750-27.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  1488 ∠-70.7° Ω

  খ

  3859 ∠-31.2° Ω

  গ

  5180 ∠-50.5° Ω

  ঘ

  1828 ∠-50.2° Ω
• Determine V_TH if R1 is changed to 3.3 kΩ.<br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018699-24.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  0.574 ∠16.7° V

  খ

  4.63 ∠16.7° V

  গ

  4.63 ∠39.5° V

  ঘ

  0.463 ∠39.5° V
• Referring to the given circuit, what is Z_TH if R1 is changed to 220 Ω? <br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018640-17.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  225 ∠12.1° Ω

  খ

  225 ∠77.9° Ω

  গ

  46 ∠77.9° Ω

  ঘ

  46 ∠12.1° Ω
• Norton's theorem gives
  ক

  An equivalent current source in parallel with an equivalent impedance

  খ

  An equivalent current source in series with an equivalent impedance

  গ

  An equivalent voltage source in parallel with an equivalent impedance

  ঘ

  An equivalent voltage source in series with an equivalent impedance
• If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant
  ক

  Is zero

  খ

  Is the sum of the two currents

  গ

  Is the difference between the two currents

  ঘ

  Cannot be determined
• The Thevenin equivalent voltage is
  ক

  Equal to the source voltage

  খ

  The same as the load voltage

  গ

  The open circuit voltage

  ঘ

  None of the above
• Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.
  ক

  True

  খ

  False
• 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.
  ক

  True

  খ

  False
• The Norton equivalent current is
  ক

  The current through the load

  খ

  The open-current from the source

  গ

  The short circuit current

  ঘ

  None of the above
• In applying the superposition theorem,
  ক

  The sources are considered one at a time with all others replaced by their internal impedance

  খ

  All sources are considered independently

  গ

  All sources are considered simultaneously

  ঘ

  The sources are considered one at a time with all others replaced by their internal resistance
• In order to get maximum power transfer from a capacitive source, the load must
  ক

  Have a capacitive reactance equal to circuit resistance

  খ

  Have an impedance that is the complex conjugate of the source impedance

  গ

  Be as capacitive as it is inductive

  ঘ

  None of the above
• The superposition theorem is useful for circuit analysis only in ac circuits.
  ক

  True

  খ

  False
• Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure. <br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018584-20.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  1,027 Hz

  খ

  10,270 Hz

  গ

  6,330 Hz

  ঘ

  63,330 Hz
• For the circuit given, determine the Thevenin voltage as seen by RL.<br><img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526018522-21.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  0.574 ∠16.7° V

  খ

  5.74 ∠16.7° V

  গ

  0.574 ∠-16.7° V

  ঘ

  5.74 ∠-16.7° V
• Referring to the given circuit, find Z_TH if R is 15 kΩ and RL is 38 kΩ. <br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526017674-23.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  89.82 ∠-51.3° kΩ

  খ

  19.2 ∠-38.3° kΩ

  গ

  9.38 ∠-51.3° kΩ

  ঘ

  180 ∠-38.3° kΩ
• A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.
  ক

  True

  খ

  False
• An equivalent circuit is one that produces the same voltage and current to a given load as the original circuit that it replaces.
  ক

  True

  খ

  False
• Determine V_TH for the circuit external to RL in the given figure.<br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526017644-15.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  135 ∠63.4° V

  খ

  13.5 ∠63.4° V

  গ

  13.5 ∠0° V

  ঘ

  135 ∠0° V
• 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.
  ক

  True

  খ

  False
• 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.
  ক

  True

  খ

  False
• Referring to the given circuit, L <br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526017612-29.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  Must be in parallel with RL

  খ

  Must be placed in parallel with VS

  গ

  Must have a reactance equal to XC

  ঘ

  Has no effect on the result
• The superposition theorem is useful for the analysis of single-source circuits.
  ক

  True

  খ

  False
• Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.
  ক

  True

  খ

  False
• For the given circuit, find V_TH for the circuit external to RL.<br> <img src="/images/question-image/electrical-engineering/circuit-theorems-in-ac-analysis/1526017585-25.png" title="Circuit Theorems In Ac Analysis mcq question image" alt="Circuit Theorems In Ac Analysis mcq question image">
  ক

  4.69 ∠51.3° V

  খ

  4.69 ∠38.7° V

  গ

  469 ∠38.7° mV

  ঘ

  6 ∠0° V
• One circuit is equivalent to another, in the context of Thevenin's theorem, when the circuits produce the same voltage.
  ক

  True

  খ

  False
• The two basic components of a Thevenin equivalent ac circuit are
  ক

  The equivalent voltage source and the equivalent series impedance

  খ

  The equivalent voltage source and the equivalent series resistance

  গ

  The equivalent voltage source and the equivalent parallel impedance

  ঘ

  The equivalent voltage source and the equivalent parallel resistance