## 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

**Answer:** no uncertainty

**Q.4. **A random signal has

- no uncertainty
- uncertainty
- partial uncertainty
- none of these

**Answer:** uncertainty

**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 α^{n}*u*(*n*) is an energy signal if

- | α| < 1
- | α| > 1
- | α| = 1
- | α| = 0

**Answer:** | α| < 1

**Q.10. **The signal α^{n}*u*(*n*) is a power signal if

- | α| < 1
- | α| > 1
- | α| = 1
- | α| = 0

**Answer:** | α| = 1

**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

**Answer:** 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*(2*n*) 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

**Answer:** 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

**Answer:** static, linear system

**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

**Answer:** invertible system

**Q.19. **A system which does not have a unique relationship between its input and output is called

- non-linear system
- non-causal system
- time-variant system
- non-invertible system

**Answer:** non-invertible system