1. Which of the following should be done in order to convert a continuous-time signal to a discrete-time signal?

A. Sampling

B. Differentiating

C. Integrating

D. None of the mentioned

2. The process of converting discrete-time continuous valued signal into discrete-time discrete valued (digital) signal is known as ____________

A. Sampling

B. Quantization

C. Coding

D. None of the mentioned

3. The difference between the unquantized x(n) and quantized xq(n) is known as ___________

A. Quantization coefficient

B. Quantization ratio

C. Quantization factor

D. Quantization error

4. Which of the following is a digital-to-analog conversion process?

A. Staircase approximation

B. Linear interpolation

C. Quadratic interpolation

D. All of the mentioned

5. The relation between analog frequency ‘F’ and digital frequency ‘f’ is?

A. F=f*T(where T is sampling perioD.

B. f=F*T

C. No relation

D. None of the mentioned

6. What is the output signal when a signal x(t)=cos(2*pi*40*t) is sampled with a sampling frequency of 20Hz?

A. cos(pi*n)

B. cos(2*pi*n)

C. cos(4*pi*n)

D. cos(8*pi*n)

7. If ‘F’ is the frequency of the analog signal, then what is the minimum sampling rate required to avoid aliasing?

A. F

B. 2F

C. 3F

D. 4F

8. What is the Nyquist rate of the signal x(t)=3cos(50*pi*t)+10sin(300*pi*t)-cos(100*pi*t)?

A. 50Hz

B. 100Hz

C. 200Hz

D. 300Hz

9. What is the discrete-time signal obtained after sampling the analog signal x(t)=cos(2000*pi*t)+sin(5000*pi*t) at a sampling rate of 5000 samples/sec?

A. cos(2.5*pi*n)+sin(pi*n)

B. cos(0.4*pi*n)+sin(pi*n)

C. cos(2000*pi*n)+sin(5000*pi*n)

D. none of the mentioned

10. If the sampling rate Fs satisfies the sampling theorem, then the relation between quantization errors of the analog signal(eq(t)) and discrete-time signal(eq(n)) is?

A. eq(t)=eq(n)

B. eq(t)<eq(n)

C. eq(t)>eq(n)

D. not related