# A2D and D2A Converters MCQ’s

This set of Digital Signal Processing Multiple Choice Questions & Answers (MCQs) focuses on “A2D and D2A Converters”.

1. Which bit coder is required to code a signal with 16 levels?
a) 8 bit
b) 4 bit
c) 2 bit
d) 1 bit

2. 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

3. Which of the following is a digital-to-analog conversion process?
a) Staircase approximation
b) Linear interpolation
d) All of the mentioned

4. 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

5. 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

6. 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

7. 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

8. 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

9. What is 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)

10. The quality of output signal from 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

11. 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

12. 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 5 Star
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