EEE 334 CIRCUITS II ADVANCED
QUESTIONS AND ANSWERS |2026/2027
UPDATE | JUST RELEASED
1. What is the transfer function H(s) of an ideal op-amp integrator circuit with input resistor R
and feedback capacitor C?
A. H(s) = -sRC
B. H(s) = -R/C
C. H(s) = 1/(sRC)
D. H(s) = -1/(sRC)
Answer: D
Conceptual Explanation: For an ideal integrator, the output voltage is proportional to the
integral of the input. In the s-domain, the feedback impedance is 1/sC and the input
impedance is R, leading to -Zf/Zi = -1/(sRC).
2. In a second-order low-pass filter, what is the roll-off rate in the stopband?
A. -20 dB/decade
B. -6 dB/octave
,C. -40 dB/decade
D. -12 dB/decade
Answer: C
Conceptual Explanation: Each pole in a circuit contributes -20 dB/decade to the roll-off. A
second-order filter has two poles, resulting in a -40 dB/decade (or -12 dB/octave) slope.
3. For a series RLC circuit, which condition describes the ‘critically damped’ state?
A. (R/2L)^2 = 1/LC
B. (R/2L)^2 > 1/LC
C. (R/2L)^2 < 1/LC
D. R = 0
Answer: A
Conceptual Explanation: Critical damping occurs when the damping ratio is equal to 1,
which for a series RLC circuit implies the neper frequency equals the resonant frequency:
alpha = omega_0.
4. The Barkhausen criterion for an oscillator to maintain steady-state oscillations requires the
loop gain to be:
A. Exactly 0
B. Exactly 1 at a phase shift of 180 degrees
C. Greater than 10
, D. Exactly 1 at a phase shift of 0 degrees
Answer: D
Conceptual Explanation: The Barkhausen stability criterion states that the magnitude of
the loop gain must be 1 and the phase shift around the loop must be an integer multiple of
360 (or 0) degrees.
5. What is the s-domain impedance of an inductor L with an initial current I0?
A. sL + LI0
B. sL (voltage source in series is LI0)
C. sL - I0/s
D. 1/sL
Answer: B
Conceptual Explanation: In Laplace circuit analysis, an inductor L is represented by an
impedance sL in series with a voltage source LI0 (or a parallel current source I0/s).
6. Which two-port parameter set is defined by expressing V1 and V2 in terms of I1 and I2?
A. Y-parameters
B. H-parameters
C. Z-parameters
D. ABCD-parameters
QUESTIONS AND ANSWERS |2026/2027
UPDATE | JUST RELEASED
1. What is the transfer function H(s) of an ideal op-amp integrator circuit with input resistor R
and feedback capacitor C?
A. H(s) = -sRC
B. H(s) = -R/C
C. H(s) = 1/(sRC)
D. H(s) = -1/(sRC)
Answer: D
Conceptual Explanation: For an ideal integrator, the output voltage is proportional to the
integral of the input. In the s-domain, the feedback impedance is 1/sC and the input
impedance is R, leading to -Zf/Zi = -1/(sRC).
2. In a second-order low-pass filter, what is the roll-off rate in the stopband?
A. -20 dB/decade
B. -6 dB/octave
,C. -40 dB/decade
D. -12 dB/decade
Answer: C
Conceptual Explanation: Each pole in a circuit contributes -20 dB/decade to the roll-off. A
second-order filter has two poles, resulting in a -40 dB/decade (or -12 dB/octave) slope.
3. For a series RLC circuit, which condition describes the ‘critically damped’ state?
A. (R/2L)^2 = 1/LC
B. (R/2L)^2 > 1/LC
C. (R/2L)^2 < 1/LC
D. R = 0
Answer: A
Conceptual Explanation: Critical damping occurs when the damping ratio is equal to 1,
which for a series RLC circuit implies the neper frequency equals the resonant frequency:
alpha = omega_0.
4. The Barkhausen criterion for an oscillator to maintain steady-state oscillations requires the
loop gain to be:
A. Exactly 0
B. Exactly 1 at a phase shift of 180 degrees
C. Greater than 10
, D. Exactly 1 at a phase shift of 0 degrees
Answer: D
Conceptual Explanation: The Barkhausen stability criterion states that the magnitude of
the loop gain must be 1 and the phase shift around the loop must be an integer multiple of
360 (or 0) degrees.
5. What is the s-domain impedance of an inductor L with an initial current I0?
A. sL + LI0
B. sL (voltage source in series is LI0)
C. sL - I0/s
D. 1/sL
Answer: B
Conceptual Explanation: In Laplace circuit analysis, an inductor L is represented by an
impedance sL in series with a voltage source LI0 (or a parallel current source I0/s).
6. Which two-port parameter set is defined by expressing V1 and V2 in terms of I1 and I2?
A. Y-parameters
B. H-parameters
C. Z-parameters
D. ABCD-parameters
