Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
1 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

Answer:Quantization
2 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

Answer:Quantization error
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3 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

Answer:All of the mentioned
4 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

Answer:f=F*T
5 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)

Answer:cos(4*pi*n)
6 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

Answer:F
7 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

Answer:300Hz
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

Answer:cos(0.4*pi*n)+sin(pi*n)
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?
A eq(t)=eq(n)
B eq(t)< eq(n)
C eq(t)>eq(n)
D not related

Answer:eq(t)=eq(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

Answer:Signal to quantization noise ratio

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