Q.1

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

  • have a capacitive reactance equal to circuit resistance
  • have an impedance that is the complex conjugate of the source impedance
  • be as capacitive as it is inductive
  • none of the above
Q.2
Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?
  • 226 mW
  • 2.26 mW
  • 4.24 mW
  • 424 mW
Q.3
For the circuit shown, determine ZTH for the portion of the circuit external to RL.
  • 66.7 ∠-33.7° kΩ
  • 6.67 ∠-333.7° kΩ
  • 14.4 ∠-56.3° kΩ
  • 1.44 ∠-33.7° kΩ
Q.4
Referring to the given circuit, find ZTH for the part of the circuit that is external to RL.
  • 129 ∠21.4° Ω
  • 43.7 ∠68.6° Ω
  • 43.7 ∠21.4° Ω
  • 12.9 ∠68.6° Ω
Q.5
Referring to the given circuit, determine ZTH as seen by RL.
  • 1444 ∠-48.5° Ω
  • 4176 ∠-73.3° Ω
  • 956 ∠-48.5° Ω
  • 1444 ∠-73.3° Ω
Q.6
Referring to the given figure, determine ZTH as seen by RL if R1 is changed to 3.3 kΩ.
  • 1488 ∠-70.7° Ω
  • 3859 ∠-31.2° Ω
  • 5180 ∠-50.5° Ω
  • 1828 ∠-50.2° Ω
Q.7
Determine VTH if R1 is changed to 3.3 kΩ.
  • 0.574 ∠16.7° V
  • 4.63 ∠16.7° V
  • 4.63 ∠39.5° V
  • 0.463 ∠39.5° V
Q.8
Referring to the given circuit, what is ZTH if R1 is changed toΩ?
  • 225 ∠12.1° Ω
  • 225 ∠77.9° Ω
  • 46 ∠77.9° Ω
  • 46 ∠12.1° Ω
Q.9
Norton's theorem gives
  • An equivalent current source in parallel with an equivalent impedance
  • An equivalent current source in series with an equivalent impedance
  • An equivalent voltage source in parallel with an equivalent impedance
  • An equivalent voltage source in series with an equivalent impedance
Q.10
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
  • Is zero
  • Is the sum of the two currents
  • Is the difference between the two currents
  • Cannot be determined
Q.11
The Thevenin equivalent voltage is
  • Equal to the source voltage
  • The same as the load voltage
  • The open circuit voltage
  • None of the above
Q.12
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.
  • True
  • False
Q.13
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.
  • True
  • False
Q.14
The Norton equivalent current is
  • The current through the load
  • The open-current from the source
  • The short circuit current
  • None of the above
Q.15
Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure.
  • 1,027 Hz
  • 10,270 Hz
  • 6,330 Hz
  • 63,330 Hz
Q.16
In applying the superposition theorem,
  • The sources are considered one at a time with all others replaced by their internal impedance
  • All sources are considered independently
  • All sources are considered simultaneously
  • The sources are considered one at a time with all others replaced by their internal resistance
Q.17
The superposition theorem is useful for circuit analysis only in ac circuits.
  • True
  • False
Q.18
For the circuit given, determine the Thevenin voltage as seen by RL.
  • 0.574 ∠16.7° V
  • 5.74 ∠16.7° V
  • 0.574 ∠-16.7° V
  • 5.74 ∠-16.7° V
Q.19
Referring to the given circuit, find ZTH if R iskΩ and RL iskΩ.
  • 89.82 ∠-51.3° kΩ
  • 19.2 ∠-38.3° kΩ
  • 9.38 ∠-51.3° kΩ
  • 180 ∠-38.3° kΩ
Q.20
A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.
  • True
  • False
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