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

11. The quality of the output signal from the A/D converter is measured in terms of ___________

A. Quantization error

B. Quantization to signal noise ratio

C. Signal to quantization noise ratio

D. Conversion constant

12. Which bit coder is required to code a signal with 16 levels?

A. 8 bit

B. 4 bit

C. 2 bit

D. 1 bit

13. What is the period of a signal x(t)?

A. T

B. 2T

C. T/2

D. None of the mentioned

14. Which of the given signals are periodic?

A. x(t) = 4 cos(5πt)

B. x(t) = u(t) – 1/2

C. x(t) = 4u(t) + 2sin(3t)

D. x[n] = 2sin(3n)

15. Check whether the signal is periodic or not?

x(t) = cos(4t) + 2sin(8t)

A. Periodic with period π/2

B. Periodic with period 2

C. Periodic with period 2/π

D. Not periodic

16. Find the periodicity of the following signal. x(t)=cos((2π/7)t)sin((3π/5)t)

A. 30

B. 7

C. 35

D. 5/3

17. Find the fundamental period of 1+sin^2 (3π/5)n.

A. 10/3

B. 5

C. 3π/5

D. None of the mentioned

18. Which signal is called an energy signal?

A. Finite energy and zero power

B. Finite energy and non-zero power

C. Infinite energy and zero power

D. Infinite energy and non-zero power

19. Which signal is said to be a power signal?

A. Infinite power and zero energy

B. Infinite power and non-zero energy

C. Finite power and infinite energy

D. Finite power and zero energy

20. Determine the periodicity and also find whether it is a power or energy signal?

e(-at)u(t)

A. Periodic and energy signal

B. Non-periodic and energy signal

C. Periodic and power signal

D. Periodic and energy signal

21. Continuous Impulse signal is a power or energy signal?

A. Power signal

B. Energy signal

C. Both power and energy

D. Neither power nor energy signal

22. Discrete impulse signal is a power or energy signal?

A. Power signal

B. Energy signal

C. Both power and energy signal

D. Neither power nor energy signal

23. A unit impulse function has?

A. Large amplitude

B. Zero pulse width

C. Unity weight

D. All of the mentioned

24. Which of the following is a common independent variable for speech signal, EEG, and ECG?

A. Time

B. Spatial coordinates

C. Pressure

D. None of the mentioned

25. Which of the following conditions made digital signal processing more advantageous over analog signal processing?

A. Flexibility

B. Accuracy

C. Storage

D. All of the mentioned

26. Which property does y(t)=x(1-t) exhibit?

A. Time scaling

B. Time shifting

C. Reflecting

D. Time shifting and reflecting

27. If x(n)=(0,1,2,3,3,0,0,0) then x(2n) is?

A. (0,2,4,6,6,0,0,0)

B. (0,1,2,3,3,0,0,0)

C. (0,2,3,0,0,0,0,0)

D. None of the mentioned

28. If x(n)=(0,0,1,2,3,4,0,0) then x(n-2) is?

A. (0,0,2,4,6,8,0,0)

B. (0,0,1,2,3,4,0,0)

C. (1,2,3,4,0,0,0,0)

D. (0,0,0,0,1,2,3,4)

29. If x(n)=(0,0,1,1,1,1,1,0) then x(3n+1) is?

A. (0,1,0,0,0,0,0,0)

B. (0,0,1,1,1,1,0,0)

C. (1,1,0,0,0,0,0,0)

D. None of the mentioned

30. If a signal x(t) is processed through a system to obtain the signal (x(t)2), then the system is said to be ____________

A. Linear

B. Non-linear

C. Exponential

D. None of the mentioned