Digital Communications Questions and Answers – Quantization – 2

This set of tricky Digital Communication Questions & Answers focuses on “Quantization”.

1. Uniform quantizer is also known as
a) Low rise type
b) Mid rise type
c) High rise type
d) None of the mentioned
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2. The SNR value can be increased by _____ the number of levels.
a) Increasing
b) Decreasing
c) Does not depend on
d) None of the mentioned
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3. Prediction gain _____ for better prediction.
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
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4. Delta modulation is
a) 1 bit DPCM
b) 2 bit DPCM
c) 4 bit DPCM
d) None of the mentioned
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5. 1 bit quantizer is a
a) Hard limiter
b) Two level comparator
c) Hard limiter & Two level comparator
d) None of the mentioned
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6. If step size is increased _____ occurs.
a) Slope overload distortion
b) Granular noise
c) Slope overload distortion & Granular noise
d) None of the mentioned
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7. Which helps in maintaining the step size?
a) Delta modulation
b) PCM
c) DPCM
d) Adaptive delta modulation
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8. The low pass filter at the output end of delta modulator depends on
a) Step size
b) Quantization noise
c) Bandwidth
d) None of the mentioned
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9. In early late timing error detection method if the bit is constant, then the slope will be
a) Close to zero
b) Close to infinity
c) Close to origin
d) None of the mentioned
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10. The theoretical gain in zero crossing TED is greater than early late TED.
a) True
b) False
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11. Non uniform quantizer ______ distortion.
a) Increases
b) Decreases
c) Does not effect
d) None of the mentioned
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12. Vector quantization is used in
a) Audio coding
b) Video coding
c) Speech coding
d) All of the mentioned
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13. The spectral density of white noise is
a) Exponential
b) Uniform
c) Poisson
d) Gaussian
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14. The probability density function of the envelope of narrow band noise is
a) Uniform
b) Gaussian
c) Rayleigh
d) Rician
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15. The type of noise that interferes much with high frequency transmission is
a) White
b) Flicker
c) Transit time
d) Shot
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16. Thermal noise power of a resistor depends upon
a) Its resistance value
b) Noise temperature
c) Bandwidth
d) Ambient temperature
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Sanfoundry Global Education & Learning Series – Digital Communications.

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