MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Signal Processing knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A causal system produces the output sequence y(n)={1,0.7} when excited by the input sequence x(n)={1,-0.7,0.1}, then what is the impulse response of the system function? |
| A. | [3(0.5)n+4(0.2)n]u(n) |
| B. | [4(0.5)n-3(0.2)n]u(n) |
| C. | [4(0.5)n+3(0.2)n]u(n) |
| D. | None of the mentioned |
| Answer» C. [4(0.5)n+3(0.2)n]u(n) | |
| 2. |
If the frequency response of an FIR system is given as H(z)=1-5/2z-1-3/2z-2, then the system is: |
| A. | Minimum phase |
| B. | Maximum phase |
| C. | Mixed phase |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
What is the frequency range(in Hz) of Electroencephalogram(EEG)? |
| A. | 10-40 |
| B. | 1000-2000 |
| C. | 0-100 |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 4. |
If the frequency response of an FIR system is given as H(z)=6+z-1-z-2, then the system is: |
| A. | Minimum phase |
| B. | Maximum phase |
| C. | Mixed phase |
| D. | None of the mentioned |
| Answer» B. Maximum phase | |
| 5. |
If the system has a impulse response as h(n)=Asin(n+1)ω0u(n), then the system is known as Digital frequency synthesizer. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
If x(n)=Aejωn is the input of an LTI system and h(n) is the response of the system, then what is the output y(n) of the system? |
| A. | H(-ω)x(n) |
| B. | -H(ω)x(n) |
| C. | H(ω)x(n) |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
Which of the following relation is true if the signal x(n) is real? |
| A. | X*(ω)=X(ω) |
| B. | X*(ω)=X(-ω) |
| C. | X*(ω)= -X(ω) |
| D. | None of the mentioned |
| Answer» C. X*(ω)= -X(ω) | |
| 8. |
For a signal x(n) to exhibit even symmetry, it should satisfy the condition | X(-ω)|=| X(ω)|. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
If the frequency response of an FIR system is given as H(z)=1-z-1-z-2, then the system is: |
| A. | Minimum phase |
| B. | Maximum phase |
| C. | Mixed phase |
| D. | None of the mentioned |
| Answer» C. Mixed phase | |
| 10. |
An IIR system with system function H(z)=(B(z))/(A(z)) is called a mixed phase if: |
| A. | All poles and zeros are inside the unit circle |
| B. | All zeros are outside the unit circle |
| C. | All poles are outside the unit circle |
| D. | Some, but not all of the zeros are outside the unit circle |
| Answer» E. | |
| 11. |
If the Eigen function of an LTI system is x(n)= Aejnπ and the impulse response of the system is h(n)=(1/2)nu(n), then what is the Eigen value of the system? |
| A. | 3/2 |
| B. | -3/2 |
| C. | -2/3 |
| D. | 2/3 |
| Answer» E. | |
| 12. |
If X(ω) is the Fourier transform of the signal x(n), then what is the Fourier transform of the signal x(n-k)? |
| A. | ejωk. X(-ω) |
| B. | ejωk. X(ω) |
| C. | e-jωk. X(-ω) |
| D. | e-jωk. X(ω) |
| Answer» E. | |
| 13. |
Which of the following condition is to be satisfied for the Fourier transform of a sequence to be equal as the Z-transform of the same sequence? |
| A. | |z|=1 |
| B. | |z|<1 |
| C. | |z|>1 |
| D. | Can never be equal |
| Answer» B. |z|<1 | |
| 14. |
Which filter has a magnitude frequency response as shown in the plot given below? |
| A. | Low pass Filter |
| B. | High pass Filter |
| C. | Band pass Filter |
| D. | Band stop Filter |
| Answer» E. | |
| 15. |
What is the convolution of the sequences of x1(n)=x2(n)={1,1,1}? |
| A. | {1,2,3,2,1} |
| B. | {1,2,3,2,1} |
| C. | {1,1,1,1,1} |
| D. | {1,1,1,1,1} |
| Answer» B. {1,2,3,2,1} | |
| 16. |
4. Which of the following relations are true if x(n) is real? |
| A. | X(ω)=X(-ω) |
| B. | X(ω)= -X(-ω) |
| C. | X*(ω)=X(ω) |
| D. | X*(ω)=X(-ω) |
| Answer» E. | |
| 17. |
An IIR system with system function H(z)=(B(z))/(A(z)) is called a minimum phase if: |
| A. | All poles and zeros are inside the unit circle |
| B. | All zeros are outside the unit circle |
| C. | All poles are outside the unit circle |
| D. | All poles and zeros are outside the unit circle |
| Answer» B. All zeros are outside the unit circle | |
| 18. |
What is the energy density spectrum Sxx(ω) of the signal x(n)=anu(n), |a|<1? |
| A. | 1/(1+2acosω+a2 ) |
| B. | 1/(1+2asinω+a2 ) |
| C. | 1/(1-2asinω+a2 ) |
| D. | 1/(1-2acosω+a2 ) |
| Answer» E. | |
| 19. |
What is the causal inverse of the FIR system with impulse response h(n)=δ(n)-aδ(n-1)? |
| A. | δ(n)-aδ(n-1) |
| B. | δ(n)+aδ(n-1) |
| C. | a -n |
| D. | an |
| Answer» E. | |
| 20. |
If the system gives an output y(n)=H(ω)x(n) with x(n)= Aejωnas input signal, then x(n) is said to be Eigen function of the system. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
What is the inverse of the system with impulse response h(n)= δ(n)-1/2 δ(n-1)? |
| A. | (1/2)nu(n) |
| B. | -(1/2)nu(-n-1) |
| C. | (1/2)nu(n) & -(1/2)nu(-n-1) |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |