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Test: A2D And D2A Converters


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10 Questions MCQ Test Digital Signal Processing | Test: A2D And D2A Converters

Test: A2D And D2A Converters for Electrical Engineering (EE) 2022 is part of Digital Signal Processing preparation. The Test: A2D And D2A Converters questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: A2D And D2A Converters MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: A2D And D2A Converters below.
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Test: A2D And D2A Converters - Question 1

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

Detailed Solution for Test: A2D And D2A Converters - Question 1

Explanation: The process of converting a continuous-time signal into a discrete-time signal by taking samples of continuous time signal at discrete time instants is known as ‘sampling’.

Test: A2D And D2A Converters - Question 2

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

Detailed Solution for Test: A2D And D2A Converters - Question 2

Explanation: In this process, the value of each signal sample is represented by a value selected from a finite set of possible values. Hence this process is known as ‘quantization’

Test: A2D And D2A Converters - Question 3

 The difference between the unquantized x(n) and quantized xq(n) is known as:

Detailed Solution for Test: A2D And D2A Converters - Question 3

Explanation: Quantization error is the difference in the signal obtained after sampling i.e., x(n) and the signal obtained after quantization i.e., xq(n) at any instant of time.

Test: A2D And D2A Converters - Question 4

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

Detailed Solution for Test: A2D And D2A Converters - Question 4

Explanation: The process of joining in terms of steps is known as staircase approximation, connecting two samples by a straight line is known as Linear interpolation, connecting three samples by fitting a quadratic curve is called as Quadratic interpolation.

Test: A2D And D2A Converters - Question 5

The relation between analog frequency ‘F’ and digital frequency ‘f’ is:

Detailed Solution for Test: A2D And D2A Converters - Question 5

Explanation: Consider an analog signal of frequency ‘F’, which when sampled periodically at a rate Fs=1/T samples per second yields a frequency of f=F/Fs=>f=F*T.

Test: A2D And D2A Converters - Question 6

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

Detailed Solution for Test: A2D And D2A Converters - Question 6

Explanation: From the question F=40Hz, Fs=20Hz
=>f=F/Fs
=>f=40/20
=>f=2Hz
=>x(n)=cos(4*pi*n).

Test: A2D And D2A Converters - Question 7

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

Detailed Solution for Test: A2D And D2A Converters - Question 7

Explanation: According to Nyquist rate, to avoid aliasing the sampling frequency should be equal to twice of the analog frequency.

Test: A2D And D2A Converters - Question 8

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

Detailed Solution for Test: A2D And D2A Converters - Question 8

Explanation: The frequencies present in the given signal are F1=25Hz, F2=150Hz, F3=50Hz
Thus Fmax=150Hz and from the sampling theorem,
nyquist rate=2*Fmax
Therefore, Fs=2*150=300Hz.

Test: A2D And D2A Converters - Question 9

 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:

Detailed Solution for Test: A2D And D2A Converters - Question 9

Explanation: If it obeys sampling theorem, then the only error in A/D conversion is quantization error. So, the error is same for both analog and discrete-time signal.

Test: A2D And D2A Converters - Question 10

 The quality of output signal from a A/D converter is measured in terms of:

Detailed Solution for Test: A2D And D2A Converters - Question 10

Explanation: The quality is measured by taking the ratio of noises of input signal and the quantized signal i.e., SQNR and is measured in terms of dB.

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