1. Sinusoidal steady-state analysis and phasor transforms of circuit elements
2. Impedance and admittance combinations in series, parallel, and delta-wye
configurations
3. Nodal and mesh analysis applied to AC circuits with complex sources
4. Superposition, source transformation, and Thevenin/Norton equivalents in
AC domain
5. AC power analysis including real, reactive, apparent power, and power
factor correction
6. Maximum average power transfer and load matching in AC circuits
7. Balanced three-phase systems including wye-delta conversions and
line/phase quantities
8. Frequency response, resonance in series and parallel RLC circuits, and
quality factor
9. Magnetically coupled circuits, mutual inductance, and ideal transformers
,10. Balanced three-phase power calculations and complex power flow in power
systems
EEE 334 Circuits II Midterm Exam
1. Which of the following statements most accurately describes the phasor
relationship between voltage and current in a pure inductor under
sinusoidal steady-state conditions?
□ Current leads voltage by exactly 90 degrees in the time domain
representation
□ Voltage leads current by exactly 90 degrees with the current lagging
behind
□ Voltage and current remain perfectly in phase with each other at all times
□ Current leads voltage by 45 degrees while voltage lags by the same
amount
✓ Voltage leads current by exactly 90 degrees with the current lagging
behind
Rationale: In a pure inductor, voltage leads current by 90 degrees because
, v = L(di/dt), and differentiation of a sinusoid produces a +90 degree phase
shift.
2. When converting a sinusoidal voltage source from the time domain to the
phasor domain, which parameter of the sinusoid is represented by the
magnitude of the phasor?
□ The angular frequency of the sinusoidal waveform measured in radians
per second
□ The peak amplitude or maximum value of the sinusoidal voltage
waveform
□ The RMS value of the sinusoidal waveform divided by the square root of
two
□ The phase angle of the sinusoidal waveform expressed in degrees
✓ The peak amplitude or maximum value of the sinusoidal voltage
waveform
Rationale: The phasor magnitude equals the peak amplitude (or RMS
depending on convention), while the angle equals the phase shift;
frequency is suppressed in the phasor domain.
, 3. Two impedances Z1 = 3 + j4 ohms and Z2 = 6 - j8 ohms are connected in
series across an AC source. What is the total equivalent impedance of this
series combination?
□ 9 - j4 ohms with a capacitive reactance dominating the combination
□ 9 + j12 ohms with an inductive reactance dominating the combination
□ 3 - j4 ohms with the real part remaining unchanged from Z1
□ 9 - j4 ohms with the imaginary part being negative overall
✓ 9 - j4 ohms with a capacitive reactance dominating the combination
Rationale: Series impedances add directly: (3+6) + j(4-8) = 9 - j4 ohms, and
the negative imaginary part indicates capacitive dominance.
4. Which of the following expressions correctly represents the admittance Y of
an impedance Z = R + jX in rectangular form?
□ Y = R/(R² + X²) - jX/(R² + X²) with the imaginary part negative for
inductive X
□ Y = R/(R² + X²) + jX/(R² + X²) with the imaginary part positive for inductive
X
□ Y = (R + jX)/(R² + X²) expressed with the same sign as the impedance
2. Impedance and admittance combinations in series, parallel, and delta-wye
configurations
3. Nodal and mesh analysis applied to AC circuits with complex sources
4. Superposition, source transformation, and Thevenin/Norton equivalents in
AC domain
5. AC power analysis including real, reactive, apparent power, and power
factor correction
6. Maximum average power transfer and load matching in AC circuits
7. Balanced three-phase systems including wye-delta conversions and
line/phase quantities
8. Frequency response, resonance in series and parallel RLC circuits, and
quality factor
9. Magnetically coupled circuits, mutual inductance, and ideal transformers
,10. Balanced three-phase power calculations and complex power flow in power
systems
EEE 334 Circuits II Midterm Exam
1. Which of the following statements most accurately describes the phasor
relationship between voltage and current in a pure inductor under
sinusoidal steady-state conditions?
□ Current leads voltage by exactly 90 degrees in the time domain
representation
□ Voltage leads current by exactly 90 degrees with the current lagging
behind
□ Voltage and current remain perfectly in phase with each other at all times
□ Current leads voltage by 45 degrees while voltage lags by the same
amount
✓ Voltage leads current by exactly 90 degrees with the current lagging
behind
Rationale: In a pure inductor, voltage leads current by 90 degrees because
, v = L(di/dt), and differentiation of a sinusoid produces a +90 degree phase
shift.
2. When converting a sinusoidal voltage source from the time domain to the
phasor domain, which parameter of the sinusoid is represented by the
magnitude of the phasor?
□ The angular frequency of the sinusoidal waveform measured in radians
per second
□ The peak amplitude or maximum value of the sinusoidal voltage
waveform
□ The RMS value of the sinusoidal waveform divided by the square root of
two
□ The phase angle of the sinusoidal waveform expressed in degrees
✓ The peak amplitude or maximum value of the sinusoidal voltage
waveform
Rationale: The phasor magnitude equals the peak amplitude (or RMS
depending on convention), while the angle equals the phase shift;
frequency is suppressed in the phasor domain.
, 3. Two impedances Z1 = 3 + j4 ohms and Z2 = 6 - j8 ohms are connected in
series across an AC source. What is the total equivalent impedance of this
series combination?
□ 9 - j4 ohms with a capacitive reactance dominating the combination
□ 9 + j12 ohms with an inductive reactance dominating the combination
□ 3 - j4 ohms with the real part remaining unchanged from Z1
□ 9 - j4 ohms with the imaginary part being negative overall
✓ 9 - j4 ohms with a capacitive reactance dominating the combination
Rationale: Series impedances add directly: (3+6) + j(4-8) = 9 - j4 ohms, and
the negative imaginary part indicates capacitive dominance.
4. Which of the following expressions correctly represents the admittance Y of
an impedance Z = R + jX in rectangular form?
□ Y = R/(R² + X²) - jX/(R² + X²) with the imaginary part negative for
inductive X
□ Y = R/(R² + X²) + jX/(R² + X²) with the imaginary part positive for inductive
X
□ Y = (R + jX)/(R² + X²) expressed with the same sign as the impedance
