A2D and D2A Converters MCQ

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

  8 bit

  খ

  4 bit

  গ

  2 bit

  ঘ

  1 bit
• The quality of output signal from A/D converter is measured in terms of ___________
  ক

  Quantization error

  খ

  Quantization to signal noise ratio

  গ

  Signal to quantization noise ratio

  ঘ

  Conversion constant
• 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?
  ক

  eq(t)=eq(n)

  খ

  eq(t)<eq(n)

  গ

  eq(t)>eq(n)

  ঘ

  not related
• 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?
  ক

  cos(2.5*pi*n)+sin(pi*n)

  খ

  cos(0.4*pi*n)+sin(pi*n)

  গ

  cos(2000*pi*n)+sin(5000*pi*n)

  ঘ

  none of the mentioned
• What is the nyquist rate of the signal x(t)=3cos(50*pi*t)+10sin(300*pi*t)-cos(100*pi*t)?
  ক

  50Hz

  খ

  100Hz

  গ

  200Hz

  ঘ

  300Hz
• If ‘F’ is the frequency of the analog signal, then what is the minimum sampling rate required to avoid aliasing?
  ক

  F

  খ

  2F

  গ

  3F

  ঘ

  4F
• What is output signal when a signal x(t)=cos(2*pi*40*t) is sampled with a sampling frequency of 20Hz?
  ক

  cos(pi*n)

  খ

  cos(2*pi*n)

  গ

  cos(4*pi*n)

  ঘ

  cos(8*pi*n)
• The relation between analog frequency ‘F’ and digital frequency ‘f’ is?
  ক

  F=f*T(where T is sampling period)

  খ

  f=F*T
• Which of the following is a digital-to-analog conversion process?
  ক

  Staircase approximation

  খ

  Linear interpolation

  গ

  Quadratic interpolation

  ঘ

  All of the mentioned
• The difference between the unquantized x(n) and quantized xq(n) is known as ___________
  ক

  Quantization coefficient

  খ

  Quantization ratio

  গ

  Quantization factor

  ঘ

  Quantization error
• The process of converting discrete-time continuous valued signal into discrete-time discrete valued (digital) signal is known as ____________
  ক

  Sampling

  খ

  Quantization

  গ

  Coding

  ঘ

  None of the mentioned
• Which of the following should be done in order to convert a continuous-time signal to a discrete-time signal?
  ক

  Sampling

  খ

  Differentiating

  গ

  Integrating

  ঘ

  None of the mentioned