Question

Minimum sampling frequency of x(t)=5cos(50*pi*t)+2cos(200*pi*t)-cos (100*pi*t) is

Answer 1

Answer:

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

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

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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

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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

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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

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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

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6. 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)

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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

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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