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Circuit Theorems in AC Analysis - General Questions
Circuit Theorems in AC Analysis - True or False

  1. 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

    2. A.
    is zero
    B.
    is the sum of the two currents
    C.
    is the difference between the two currents
    D.
    cannot be determined

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  2. The Thevenin equivalent voltage is

    3. A.
    equal to the source voltage
    B.
    the same as the load voltage
    C.
    the open circuit voltage
    D.
    none of the above

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  3. Referring to the given circuit, L

    4. 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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  4. Referring to the given circuit, find ZTH for the part of the circuit that is external to RL.

    5. A.
    12921.4°
    B.
    43.768.6°
    C.
    43.721.4°
    D.
    12.968.6°

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  5. In order to get maximum power transfer from a capacitive source, the load must

    6. 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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  6. Referring to the given circuit, determine ZTH as seen by RL.

    7. A.
    1444–48.5°
    B.
    4176 –73.3°
    C.
    956 –48.5°
    D.
    1444 –73.3°

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  7. Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?

    8. A.
    226 mW
    B.
    2.26 mW
    C.
    4.24 mW
    D.
    424 mW

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  8. The Norton equivalent current is

    9. A.
    the current through the load
    B.
    the open-current from the source
    C.
    the short circuit current
    D.
    none of the above

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  9. Determine VTH if R1 is changed to 3.3 k.

    10. A.
    0.57416.7° V
    B.
    4.6316.7° V
    C.
    4.6339.5° V
    D.
    0.46339.5° V

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  10. Referring to the given circuit, what is VTH if VS = 120° V?

    11. A.
    4.6938.7° V
    B.
    9.3838.7° V
    C.
    120° V
    D.
    60° V

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