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Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

Free download in PDF Digital Signal Processing Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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
(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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