# Discrete-Time Signals and Systems MCQ

## Discrete-Time Signals and Systems MCQ

Discrete-Time Signals and Systems MCQ, Multiple Choice Questions on discrete-Time Signals and Systems, Digital Signal Processing MCQ, Discrete-Time Signals MCQ, Discrete-Time Systems MCQ, Engineering MCQ

Discrete Convolution and Correlation MCQ

### Objective Type Questions

Q.1. A signal can be represented in

• time domain
• frequency domain
• both time and frequency domain
• none of these

Answer: both time and frequency domain

Q.2.  δ(n) =

• u(n) + u(n – 1)
• u(n) u(n – 1)
• u(n) – u(n – 1)
• u(n – 1) – u(n)

Answer: u(n) – u(n – 1)

Q.3. A deterministic signal has

• no uncertainty
• uncertainty
• partial uncertainty
• none of these

Q.4. A random signal has

• no uncertainty
• uncertainty
• partial uncertainty
• none of these

Q.5. The fundamental period of a discrete-time complex exponential sequence is N =

• $\frac{2\Pi }{\omega_{0}}$
• $\frac{2\Pi }{m}\omega_{0}$
• $\frac{2\Pi }{\omega_{0}}m$
• $2\Pi m \omega_{0}$

Answer: $\frac{2\Pi }{\omega_{0}}m$

Q.6. The fundamental period of a sinusoidal sequence is N =

• $2\Pi m$
• $\frac{\omega_{0} }{2\Pi m}$
• $m\omega_{0}$
• $\frac{2\Pi }{\omega_{0}}m$

Answer: $\frac{2\Pi }{\omega_{0}}m$

Q.7. A signal is an energy signal if

• E = 0, P = 0
• E = ∞, P = finite
• E = finite, P = 0
• E = finite, P = ∞

Answer: E = finite, P = 0

Q.8. A signal is a power signal if

• P = finite, E = 0
• P = finite, E = ∞
• P = finite, E = finite
• P = ∞, E = ∞

Answer: P = finite, E = ∞

Q.9. The signal αnu(n) is an energy signal if

• | α| < 1
• | α| > 1
• | α| = 1
• | α| = 0

Q.10. The signal αnu(n) is a power signal if

• | α| < 1
• | α| > 1
• | α| = 1
• | α| = 0

Q.11. A system whose output depends on future inputs is a

• static system
• dynamic system
• non-causal system
• both dynamic and non-causal system

Answer: both dynamic and non-causal system

Q.12. A non-anticipative system is a

• static system
• dynamic system
• causal system
• non-causal system

Q.13. y(n) = x(n + 2) is for a

• linear system
• dynamic system
• both linear and dynamic system
• non-linear system

Answer: both linear and dynamic system

Q.14. y(n) = x(2n) is for a

• time-invariant system
• time varying, dynamic system
• linear, time varying, dynamic system
• linear, time-invariant, static system

Answer: linear, time varying, dynamic system

Q.15. y(n) = x(–n) is for a

• non-causal system
• linear, causal, time-invariant system
• linear, non-causal, time-invariant system
• linear, non-causal, time-varying, dynamic system

Answer: linear, non-causal, time-varying, dynamic system

Q.16. y(n) = x(n) + nx(n – 1) is for a

• dynamic system
• causal system
• linear system
• all of these

Q.17. y(n) = x(n) u(n) is for a

• static, linear system
• causal, time-invariant system
• both the above
• none of these

Q.18. A system which has a unique relationship between its input and output is called

• linear system
• causal system
• time-invariant system
• invertible system