Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Digital Signal Processing 3

**Part 3: List for questions and answers of Digital Signal Processing**

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**Q1. A filter is said to be linear phase filter if the phase delay and group delay are _______**

**a) High**

**b) Moderate**

**c) Low**

**d) Constant**

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**Q2. Basically, group delay is the delayed response of filter as a function of ________**

**a) Phase**

**b) Amplitude**

**c) Frequency**

**d) All of the above**

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**Q3. A direct partial-fraction expansion of the transfer function in Z leads to**

**a) The parallel form II structure**

**b) The parallel form I structure**

**c) Cascaded structure**

**d) None of the above**

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**Q4. A partial-fraction expansion of the transfer function in Z-1 leads to**

**a) The parallel form II structure**

**b) The parallel form I structure**

**c) Cascaded structure**

**d) None of the above**

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**Q5. Parallel form of realisation is done in**

**a) High speed filtering applications**

**b) Low speed filtering applications**

**c) Both a and b**

**d) None of the above**

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**Q6. In the cascaded form of realisation, the polynomials are factored into**

**a) a product of 1st-order and 2nd-order polynomials**

**b) a product of 2nd-order and 3rd-order polynomials**

**c) a sum of 1st-order and 2nd-order polynomials**

**d) a sum of 2nd-order and 3rd-order polynomials **

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**Q7. The transformation technique in which there is one to one mapping from s-domain to zdomain is**

**a) Approximation of derivatives**

**b) Impulse invariance method**

**c) Bilinear transformation method**

**d) Backward difference for the derivative**

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**Q8. The impulse invariant method is obtained by**

**a) Sampling the impulse response of an equivalent analog filter**

**b) Taking backward difference for the derivative**

**c) Mapping from s-domain to z-domain**

**d) Approximation of derivatives**

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**Q9. The partial fraction of x2+1/x(x-1)2 is**

**a) 1/ (x-1) + 2/(x-1)2 – 1/x**

**b) 1/ (x-1) + 2/(x-1)2 – 3/x**

**c) 1/ (x-1) + 2/(x-1)2 – 3/x2**

**d) 1/ (x+1) + 2/(x+1)2 – 1/x**

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**Q10. Partial fraction method involves**

**a) Allotting coefficients**

**b) Dividing the numerator by denominator to get fractions**

**c) Dividing single fraction into parts**

**d) None of the above**

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**Q11. The condition for a system to be stable is**

**a) All poles of its transfer function lie on the left half of s-plane**

**b) All poles of its transfer function must be right half of s-plane**

**c) All zeros of its transfer function must be right half of s-plane**

**d) All zeros of its transfer function must be left half of s-plane**

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**Q12. The condition for a system to be causal is**

**a) All poles of its transfer function must be left half of s-plane**

**b) All poles of its transfer function must be right half of s-plane**

**c) All zeros of its transfer function must be right half of s-plane**

**d) All zeros of its transfer function must be left half of s-plane **

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**Q13. Damping is the ability of a system**

**a) To support oscillatory nature of the system’s transient response**

**b) To oppose the continuous nature of the system’s transient response**

**c) To oppose the oscillatory nature of the system’s transient response**

**d) To support the discrete nature of the system’s transient response**

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**Q14. ROC does not have**

**a) zeros**

**b) poles**

**c) negative values**

**d) positive values**

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**Q15. Radix – 2 FFT algorithm performs the computation of DFT in**

**a) N/2Log2 N multiplications and 2Log2 N additions**

**b) N/2Log2 N multiplications and NLog2 N additions**

**c) Log2 N multiplications and N/2Log2 N additions**

**d) NLog2 N multiplications and N/2Log2 N additions**

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**Q16. For the calculation of N- point DFT, Radix -2 FFT algorithm repeats**

**a) 2(N Log2 N) stages**

**b) (N Log2 N)2/2 stages**

**c) (N Log2 N)/2 stages**

**d) (N Log2(2 N))/2 stages**

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**Q17. The circular convolution of two sequences in time domain is equivalent to**

**a) Multiplication of DFTs of two sequences**

**b) Summation of DFTs of two sequences**

**c) Difference of DFTs of two sequences**

**d) Square of multiplication of DFTs of two sequences**

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**Q18. Circular shift of an N point is equivalent to**

**a) Circular shift of its periodic extension and its vice versa**

**b) Linear shift of its periodic extension and its vice versa**

**c) Circular shift of its aperiodic extension and its vice versa**

**d) Linear shift of its aperiodic extension and its vice versa **

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**Q19. Causal systems are the systems in which**

**a) The output of the system depends on the present and the past inputs**

**b) The output of the system depends only on the present inputs**

**c) The output of the system depends only on the past inputs**

**d) The output of the system depends on the present input as well as the previous**

**outputs**

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**Q20. Time reversal of a discrete time signal refers to**

**a) y[n] = x[-n+k]**

**b) y[n] = x[-n]**

**c) y[n] = x[-n-k]**

**d) y[n] = x[n-k] **

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**Part 3: List for questions and answers of Digital Signal Processing**

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**Q1. Answer: d**

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**Q2. Answer: c**

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**Q3. Answer: b**

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**Q4. Answer: b**

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**Q5. Answer: a**

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**Q6. Answer: a**

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**Q7. Answer: c**

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**Q8. Answer: a**

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**Q9. Answer: a**

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**Q10. Answer: c**

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**Q11. Answer: a**

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**Q12. Answer: b**

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**Q13. Answer: c**

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**Q14. Answer: b**

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**Q15. Answer: b**

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**Q16. Answer: c**

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**Q17. Answer: a**

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**Q18. Answer: d**

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**Q19. Answer: a**

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**Q20. Answer: b**