| 1. | The Nyquist sampling intervals, for the signal Sinc (700t)+Sinc(500t) is ? | |
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1/175 sec
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1/350 sec
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1/350 sec
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1/700 sec
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Report Question| 2. | Which of the following circuit is not used in a digital frequency meter ? | |
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Schmitt
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S/H
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Counter
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Oscillator
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| 3. | …………is used to find the signal amplitude of each sample, whereas………….is used to differentiate if from last one sample ? | |
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DM,CM
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CM,DM
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DM,PCM
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PCM,DM
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| 4. | Which type of encoding are unipolar, bipolar and polar encoding ? | |
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Block
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NRZ
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Line
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Manchester
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| 5. | In a band limited channel higher bit rate can be transmitted with ? | |
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BPSK
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OPSK
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FM
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FSK
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| 6. | The number of bits per sample of a PCM system depends upon the ? | |
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Sampler type
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Quantizer type
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Number of levels of the quantizer
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Sampling rate
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| 7. | Which of the following statement (s) is/are true, 1. Probability of error in DPSK is less than PSK. 2. Amplitude shift keying is also known as “on-off keying” ? | |
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Only 1
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Both 1 and 2
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Only 2
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Neither 1 nor 2
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| 8. | A Pulse position modulation is a process where ? | |
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Width of the pulse is varied as function of sample value
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The sample value is first coded
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The amplitude & width of the pulse is kept constant, while the position of each pulse is varied by instantaneous sample value of the modulating wave
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The amplitude and width of the pulses are varied, and the position of each pulse is varied by instantaneous sample value of the modulating wave
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| 9. | If the sampling rate in any pulse modulation system exceeds …………… the maximum signal frequency, the original signal can be reconstructed in the receiver with minimal distortion ? | |
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For times
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Twice
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Once
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Three times
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| 10. | The use of non-uniform quantization leads to ? | |
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Reduction in transmission bandwidth
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Increase in maximum SNR
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Increase in SNR for signal levels
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Simplification of quantization
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