Signal processing MCQs Part-2

Signal processing

1. FFT may be used to calculate__________.

1) DFT

2) IDFT

3) Direct Z transform

4) In direct Z transform

a. 1, 2 and 3 are correct

b. 1 and 2 are correct

c. 1 and 3 are correct

d. All the four are correct

2. DIT algorithm divides the sequence into_______.

a. Positive and negative values

b. Even and odd samples

c. Upper higher and lower spectrum

d. Small and large samples

3. The computational procedure for Decimation in frequency algorithm takes_________.

a. Log2 N stages

b. 2Log2 N stages

c. Log2 N2 stages

d. Log2 N/2 stages

4. The transformations are required for_______.

1) Analysis in time or frequency domain

2) Quantization

3) Easier operations

4) Modulation

a. 1, 2 and 3 are correct

b. 1 and 2 are correct

c. 1 and 3 are correct

d. All the four are correct

5. The s plane and z plane are related as_____.

a. z = esT

b. z = e2sT

c. z = 2esT

d. z = esT/2

6. The similarity between the Fourier transform and the z transform is that_______.

a. Both convert frequency spectrum domain to discrete time domain

b. Both convert discrete time domain to frequency spectrum domain

c. Both convert analog signal to digital signal

d. Both convert digital signal to analog signal

7. The ROC of a system is the_______.

a. range of z for which the z transform converges

b. range of frequency for which the z transform exists

c. range of frequency for which the signal gets transmitted

d. range in which the signal is free of noise

8. The several ways to perform an inverse Z transform are_________.

1) Direct computation

2) Long division

3) Partial fraction expansion with table lookup

4) Direct inversion

a. 1, 2 and 3 are correct

b. 1 and 2 are correct

c. 2 and 3 are correct

d. All the four are correct

9. The anti-causal sequences have ______ components in the left-hand sequences.

a. Positive

b. Negative

c. Both a and b

d. None of the above

10. For an expanded power series method, the coefficients represent______.

a. Inverse sequence values

b. Original sequence values

c. Negative values only

d. Positive values only

11. The region of convergence of x/ (1+2x+x2) is________.

a. 0

b. 1

c. Negative

d. Positive

12. The IIR filter designing involves_________.

a. Designing of analog filter in analog domain and transforming into digital domain

b. Designing of digital filter in analog domain and transforming into digital domain

c. Designing of analog filter in digital domain and transforming into analog domain

d. Designing of digital filter in digital domain and transforming into analog domain

13. For a system function H(s) to be stable______.

a. The zeros lie in the left half of the s plane

b. The zeros lie in the right half of the s plane

c. The poles lie in the left half of the s plane

d. The poles lie in the right half of the s plane

14. IIR filter design by approximation of derivatives has the limitations________.

1) Used only for transforming analog high pass filters

2) Used for band pass filters having smaller resonant frequencies

3) Used only for transforming analog low pass filters

4) Used for band pass filters having high resonant frequencies

a. 1, 2 and 3 are correct

b. 1 and 2 are correct

c. 2 and 3 are correct

d. All the four are correct

15. The filter that may not be realized by approximation of derivatives techniques are________.

1) Band pass filters

2) High pass filters

3) Low pass filters

4) Band reject filters

a. 1, 2 and 3 are correct

b. 2 and 4 are correct

c. 2 and 3 are correct

d. All the four are correct

16. In direct form for realization of IIR filters, ______.

1) Denominator coefficients are the multipliers in the feed forward paths

2) Multipliers in the feedback paths are the positives of the denominator coefficients

3) Numerator coefficients are the multipliers in the feed forward paths

4) Multipliers in the feedback paths are the negatives of the denominator coefficients

a. 1, 2 and 3 are correct

b. 1 and 2 are correct

c. 3 and 4 are correct

d. All the four are correct

17. The direct form II for realization involves______.

1) The realization of transfer function into two parts

2) Realization after fraction

3) Product of two transfer functions

4) Addition of two transfer functions

a. 1, 2 and 3 are correct

b. 1 and 3 are correct

c. 3 and 4 are correct

d. All the four are correct

18. The cascade realization of IIR systems involves_________.

1) The transfer function broken into product of transfer functions

2) The transfer function divided into addition of transfer functions

3) Factoring the numerator and denominator polynomials

4) Derivatives of the transfer functions

a. 1, 2 and 3 are correct

b. 1 and 3 are correct

c. 3 and 4 are correct

d. All the four are correct

19. The advantage of using the cascade form of realization is________.

1) It has a same number of poles and zeros as that of individual components

2) The number of poles is the product of poles of individual components

3) The number of zeros is the product of poles of individual components

4) Over all transfer function may be determined

a. 1, 2 and 3 are correct

b. 1 and 3 are correct

c. 1 and 4 are correct

d. All the four are correct

20. Which among the following represent/s the characteristic/s of an ideal filter?

a. Constant gain in pass band

b. Zero gain in stop band

c. Linear Phase Response

d. All of the above

21. FIR filters ________.

A. are non-recursive

B. do not adopt any feedback

C. are recursive

D. use feedback

a. A & B

b. C & D

c. A & D

d. B & C

22. In tapped delay line filter, the tapped line is also known as ________.

a. Pick-on node

b. Pick-off node

c. Pick-up node

d. Pick-down node

23. How is the sensitivity of filter coefficient quantization for FIR filters?

a. Low

b. Moderate

c. High

d. Unpredictable

24. Decimation is a process in which the sampling rate is __________.

a. enhanced

b. stable

c. reduced

d. unpredictable

25. Anti-imaging filter with cut-off frequency ωc = π/ I is specifically used _______. up sampling process for the removal of unwanted images.

a. Before

b. At the time of

c. After

d. All of the above

26. Which units are generally involved in Multiply and Accumulate (MAC)?

a. Adder

b. Multiplier

c. Accumulator

d. All of the above