Signal processing MCQs Part-1

Signal processing

1.Which of the following is an method for implementing an FIR system?

a) Direct form

b) Cascade form

c) Lattice structure

d) All of the mentioned

2. How many memory locations are used for storage of the output point of a sequence of  length M in direct form realization?

a) M+1

b) M

c) M-1

d) none of the mentioned

3. What is the general system function of an FIR system?

a) ΣM−1k=0bkx(n−k)

b) ΣMk=0bkz−k

c) ΣM−1k=0bkz−k

d) None of the mentioned

4. Which of the following is an method for implementing an FIR system?

a) Direct form

b) Cascade form

c) Lattice structure

d) All of the mentioned

5. The realization of FIR filter by frequency sampling realization can be viewed as cascade of how many filters?

a) Two

b) Three

c) Four

d) None of the mentioned

6. Where does the poles of the system function of the second filter locate?

a) ej2π(k+α)M

b) ej2π(k+α)/M

c) ej2π(k-α)/M

d) ejπ(k+α)/M

7. The zeros of the system function of comb filter are located at ____________.

a) Inside unit circle

b) On unit circle

c) Outside unit circle

d) None of the mentioned

8. By combining two pairs of poles to form a fourth order filter section, by what factor we have reduced the number of multiplications?

a) 25%

b) 30%

c) 40%

d) 50%

9.What is the value of the coefficient α2(1) in the case of FIR filter represented in direct form structure with m=2 in terms of K1 and K2?

a) K1(K2)

b) K1(1-K2)

c) K1(1+K2)

d) None of the mentioned

10. What are the nodes that replace the adders in the signal flow graphs?

a) Source node

b) Sink node

c) Branch node

d) Summing node

11. If we reverse the directions of all branch transmittances and interchange the input and output in the flow graph, then the resulting structure is called as ______________

a) Direct form-I

b) Transposed form

c) Direct form-II

d) None of the mentioned

12. If M and N are the orders of numerator and denominator of rational system function respectively, then how many memory locations are required in direct form-I realization of that IIR filter?

a) M+N+1

b) M+N

c) M+N-1

d) M+N-2

13. The interface between an analog signal and a digital processor is______.

a) D/A converter

b) A/D converter

c) Modulator

d) Demodulator

14. The speech signal is obtained after______.

a) Analog to digital conversion

b) Digital to analog conversion

c) Modulation

d) Quantization

15. Telegraph signals are examples of______.

a) Digital signals

b) Analog signals

c) Impulse signals

d) Pulse train

16. As compared to the analog systems, the digital processing of signals allow_____.

1) Programmable operations

2) Flexibility in the system design

3) Cheaper systems

4) More reliability

a) 1, 2 and 3 are correct

b) 1 and 2 are correct

c) 1, 2 and 4 are correct

d)  All the four are correct

17. The Nyquist theorem for sampling______.

1) Relates the conditions in time domain and frequency domain

2) Helps in quantization

3) Limits the bandwidth requirement

4) Gives the spectrum of the signal

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

18. Roll-off factor is_______.

a) The bandwidth occupied beyond the Nyquist Bandwidth of the filter

b) The performance of the filter or device

c) Aliasing effect

d) None of the above

19. A discrete time signal may be______.

1) Samples of a continuous signal

2) A time series which is a domain of integers

3) Time series of sequence of quantities

4) Amplitude modulated wave

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

20. The discrete impulse function is defined by______.

a) δ(n) = 1, n ≥ 0= 0, n ≠ 1

b) δ(n) = 1, n = 0= 0, n ≠ 1

c) δ(n) = 1, n ≤ 0= 0, n ≠ 1

d) δ(n) = 1, n ≤ 0= 0, n ≥ 1

21. DTFT is the representation of______.

a) Periodic Discrete time signals

b) Aperiodic Discrete time signals

c) Aperiodic continuous signals

d) Periodic continuous signals

22. The transforming relations performed by DTFT are_________.

1) Linearity

2) Modulation

3) Shifting

4) Convolution

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

23. The DFT is preferred for__________.

1) Its ability to determine the frequency component of the signal

2) Removal of noise

3) Filter design

4) Quantization of signal

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

24. Frequency selectivity characteristics of DFT refers to_______.

a) Ability to resolve different frequency components from input signal

b) Ability to translate into frequency domain

c) Ability to convert into discrete signal

d) None of the above

25. The Cooley–Tukey algorithm of FFT is a________.

a) Divide and conquer algorithm

b) Divide and rule algorithm

c) Split and rule algorithm

d) Split and combine algorithm