RC / RLC Circuit
Time-domain response, frequency response (Bode plot), resonance and quality factor
Parameters
1. What does the time constant τ physically represent in an RC circuit?
A. The time over which the signal reaches (1-1/e)≈63% of its final value
B. The time after which the signal completely disappears
C. Half the resonant period
D. The maximum current in the circuit
2. What happens to the RLC circuit's step response when the damping ratio zeta < 1?
A. The response is oscillatory — it overshoots the final value and settles onto it through decaying oscillation
B. The circuit does not respond at all
C. The response reaches the final value monotonically and fastest, without oscillation
D. The circuit is destroyed
3. How are the quality factor Q and the bandwidth Δf related in a resonant circuit?
A. Δf = f₀/Q — მაღალი Q → ვიწრო ზოლი
B. Δf = Q·f₀ — მაღალი Q → ფართო ზოლი
C. Δf დამოუკიდებელია Q-სგან
D. Q = Δf
4. What is the phase shift at an RC filter's cutoff frequency?
A. At the cutoff frequency the phase shift is exactly 45°, not 90°
B. The phase shift is always 0°
C. The phase shift is infinite
D. The phase shift depends only on temperature