Question

Frequency domain analysis is preferred when dealing with systems having input as _______.

• A. ramp and parabolic
• B. sinusoidal with fixed frequency
• C. sinusoidal with variable frequency and amplitude
• D. non-sinusoidal with lagging power factor

Hint:

Frequency response methods like Bode and Nyquist assume input is sinusoidal and steady.

Answer 1

The Correct Option is B

Step 1: Understand frequency domain analysis.
Used to analyze the steady-state response of systems to sinusoidal inputs using phasors or transfer functions $H(j\omega)$.
Step 2: Input type preference.
This method is especially effective for:
- Sinusoidal inputs with constant frequency
- Bode plots and Nyquist diagrams are based on frequency sweeps
Step 3: Why not other options?
- Ramp/parabolic are time-domain signals
- Variable-frequency sinusoids require time-varying models
- Non-sinusoidal signals need Fourier series, not basic frequency response
Conclusion: Frequency domain is best suited for $\boxed{\text{sinusoidal inputs with fixed frequency}}$