1. The basic task of the A/D converter is to convert a discrete set of digital code words into a continuous range of input amplitudes.

A. True

B. False

2. What is the type of quantizer, if a Zero is assigned a quantization level?

A. Midrise type

B. Mid tread type

C. Mistreat type

D. None of the mentioned

3. What is the type of quantizer, if a Zero is assigned a decision level?

A. Midrise type

B. Mid tread type

C. Mistreat type

D. None of the mentioned

4. What is the term used to describe the range of an A/D converter for bipolar signals?

A. Full scale

B. FSR

C. Full-scale region

D. FS

5. What is the term used to describe the range of an A/D converter for uni-polar signals?

A. Full scale

B. FSR

C. Full-scale region

D. FSS

6. What is the fixed range of the quantization error eq(n)?

A. \(\frac{\Delta}{6}\) < e<sub>q</sub>(n) ≤ \(\frac{\Delta}{6}\)

B. \(\frac{\Delta}{4}\) < e<sub>q</sub>(n) ≤ \(\frac{\Delta}{4}\)

C. \(\frac{\Delta}{2}\) < e<sub>q</sub>(n) ≤ \(\frac{\Delta}{2}\)

D. \(\frac{\Delta}{16}\) < e<sub>q</sub>(n) ≤ \(\frac{\Delta}{16}\)

7. If the dynamic range of the signal is smaller than the range of the quantizer, the samples that exceed the quantizer are clipped, resulting in a large quantization error.

A. True

B. False

8. What is the relation defined by the operation of quantizer?

A. xq(n) ≡ Q[x(n)] = \(\hat{x}_k\)

B. xq(n) = Q[x(n)] = \(\hat{x}_k\), if x(n) ∈ Ik

C. xq(k) ≡ Q[x(k)] =\(\hat{x}_k\)

D. none of the mentioned

9. What is the step size or the resolution of an A/D converter?

A. Δ = (R)/2(b+1)

B. Δ = (R)/2(b-1)

C. Δ = (R)/3(b+1)

D. Δ = (R)/2

10. In the practical A/D converters, if the first transition may not occur at exactly + 1/2 LSB, then such kind of error is known as ____________

A. Scale-factor error

B. Offset error

C. Linearity error

D. All of the mentioned

11. In the practical A/D converters, if the difference between the values at which the first transition and the last transition occur is not equal to FS – 2LSB, then such error is known as _________

A. Scale-factor error

B. Offset error

C. Linearity error

D. All of the mentioned

12. In the practical A/D converters, if the differences between transition values are not all equal or uniformly changing, then such error is known as?

A. Scale-factor error

B. Offset error

C. Linearity error

D. All of the mentioned

11. For a given number of bits, the power of quantization noise is proportional to the variance of the signal to be quantized.

A. True

B. False

12. What is the variance of the difference between two successive signal samples, d(n) = x(n) – x(n-1)?

A. \(σ_d^2=2σ_x^2 [1+γ_{xx} (1)]\)

B. \(σ_d^2=2σ_x^2 [1-γ_{xx} (1)]\)

C. \(σ_d^2=4σ_x^2 [1-γ_{xx} (1)]\)

D. \(σ_d^2=3σ_x^2 [1-γ_{xx} (1)]\)

13. What is the variance of the difference between two successive signal samples, d(n) = x(n)–ax(n-1)?

A. \(σ_d^2=2σ_x^2 [1-a^2]\)

B. \(σ_d^2=σ_x^2 [1+a^2]\)

C. \(σ_d^2=σ_x^2 [1-a^2]\)

D. \(σ_d^2=2σ_x^2 [1+a^2]\)

14. If the difference d(n) = x(n)–ax(n-1), then what is the optimum choice for a = ?

A. \({γ_{xx} (1)}{σ_x^2}\)

B. \({γ_{xx} (0)}{σ_x^2}\)

C. \({γ_{xx} (0)}{σ_d^2}\)

D. \({γ_{xx} (1)}{σ_d^2}\)

15. What is the quantity ax(n-1) is called?

A. Second-order predictor of x(n)

B. Zero-order predictor of x(n)

C. First-order predictor of x(n)

D. Third-order predictor of x(n)

16. The differential predictive signal quantizer system is known as?

A. DCPM

B. DMPC

C. DPCM

D. None of the mentioned

17. What is the expansion of DPCM?

A. Differential Pulse Code Modulation

B. Differential Plus Code Modulation

C. Different Pulse Code Modulation

D. None of the mentioned

18. What are the main uses of DPCM?

A. Speech Decoding and Transmission over mobiles

B. Speech Encoding and Transmission over mobiles

C. Speech Decoding and Transmission over telephone channels

D. Speech Encoding and Transmission over telephone channels

19. To reduce the dynamic range of the difference signal d(n) = x(n) – \(\hat{x}(n)\), thus a predictor of order p has the form?

A. \(\hat{x}(n)=\sum_{k=1}^pa_k x(n+k)\)

B. \(\hat{x}(n)=\sum_{k=1}^pa_k x(n-k)\)

C. \(\hat{x}(n)=\sum_{k=0}^pa_k x(n+k)\)

D. \(\hat{x}(n)=\sum_{k=0}^pa_k x(n-k)\)

20. The simplest form of differential predictive quantization is called?

A. AM

B. BM

C. DM

D. None of the mentioned

21. What is the abbreviation of DM?

A. Diameter Modulation

B. Distance Modulation

C. Delta Modulation

D. None of the mentioned