# A2D & D2A Converters MCQ Questions & Answers

A2D & D2A Converters MCQs : This section focuses on the "A2D & D2A Converters". These Multiple Choice Questions (MCQs) should be practiced to improve the A2D & D2A Converters skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

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

Question 2

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

A. eq(t)=eq(n)
B. eq(t)C. eq(t)>eq(n)
D. not related

Question 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

Question 4

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

Question 5

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

Question 6

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

Question 7

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)

Question 8

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

Question 9

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

Question 10

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

A. 8 bit
B. 4 bit
C. 2 bit
D. 1 bit

Question 11

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

A. Staircase approximation
B. Linear interpolation
D. All of the mentioned