Signals and Systems MCQs January 8, 2026July 11, 2024 by u930973931_answers 25 min Score: 0 Attempted: 0/25 Subscribe 1. Which of the following is not a continuous-time signal? (A) Sinusoidal signal (B) Impulse signal (C) Unit step signal (D) Rectangular pulse 2. The Laplace transform of a unit impulse δ(t) is: (A) ∞ (B) 0 (C) 1 (D) Cannot be determined 3. The property of a signal that determines whether it is odd or even is: (A) Symmetry (B) Periodicity (C) Linearity (D) Causality 4. A system that depends only on the current and past inputs is: (A) Non-causal (B) Causal (C) Anti-causal (D) Acausal 5. Which of the following is a linear time-invariant (LTI) system property? (A) Memory (B) Superposition (C) Causal (D) Time-varying 6. The convolution of two signals in time domain corresponds to which operation in Laplace domain? (A) Addition (B) Multiplication (C) Differentiation (D) Integration 7. Which of the following signals is periodic? (A) e^(-t) (B) t (C) sin(t) (D) δ(t) 8. The Fourier series of a periodic signal expresses it as a sum of: (A) Both sine and cosine functions (B) Sine functions (C) Exponentials (D) Cosine functions 9. The transfer function H(s) of a system is used to analyze its: (A) Input-output behavior (B) All of the above (C) Phase response (D) Frequency response 10. The region of convergence (ROC) of the Laplace transform is determined by the: (A) None of the above (B) Magnitude of the zeros (C) Exponential growth of the signal (D) Magnitude of the poles 11. Which property is NOT associated with a causal system? (A) Stability (B) Memory (C) Predictability (D) Non-zero initial conditions 12. The Laplace transform of a ramp signal t*u(t) is: (A) 1/s² (B) 1/s³ (C) 1/s² – 1/s (D) 1/s² + 1/s 13. The property of a system that ensures its output depends only on present and future inputs is: (A) Causality (B) Time-invariance (C) Linearity (D) Memory 14. The Fourier transform of a real and even signal is: (A) Real and even (B) Real and odd (C) Complex and even (D) Complex and odd 15. The Laplace transform of a derivative of a signal x(t) with respect to time is: (A) X(s)/s (B) sX(s) (C) X(s) (D) X'(s) 16. The frequency response of a system is defined as the: (A) Ratio of output to input in frequency domain (B) Ratio of output to input in time domain (C) Impulse response of the system (D) None of the above 17. The Fourier transform of a Gaussian function in time domain is another Gaussian function in: (A) Time domain (B) Both (C) Frequency domain (D) Neither 18. Which of the following properties is true for the impulse response of a system? (A) It is always causal (B) It is a characteristic of the system (C) It is always stable (D) It is always linear 19. The Laplace transform of the convolution of two functions x(t) and y(t) is: (A) X(s)Y(s) (B) X(s)/Y(s) (C) X(s) + Y(s) (D) X(s)Y(s)/2 20. Which of the following signals is not time-limited? (A) sin(t) (B) t*u(t) (C) e^(-t) (D) δ(t) 21. The region in the s-plane where the Laplace transform converges is called the: (A) Stability region (B) Causality region (C) Frequency response region (D) Region of convergence (ROC) 22. The Fourier transform of a rectangular pulse of duration T in time domain is: (A) sinc(fT) (B) T sinc(fT) (C) sin(fT)/fT (D) cos(fT)/fT 23. A system is said to be BIBO stable if: (A) Its impulse response decays to zero (B) It is causal and stable (C) It has bounded input and bounded output (D) Its frequency response is constant 24. Which of the following is a continuous-time, periodic signal? (A) e^(-t) (B) u(t) (C) sin(t) (D) δ(t) 25. The Laplace transform of a unit step signal u(t) is: (A) 1/s² (B) 1/(s+1) (C) 1/s (D) 1/(s-1)