| 1. | One important application for diodes is recovering information from transmitted signals. This is referred to as ? | |
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Regeneration
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Ionization
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Biasing
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demodulation
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Report Question| 2. | The ring modulator is generally used for generating ? | |
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SSB/SC signal
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DSB/SC
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ISI signal
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Wideband signal
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| 3. | De-emphasis circuit is used ? | |
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To attenuate low frequencies
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To attenuate misbrand frequencies
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To attenuate high frequencies
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None of the above
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| 4. | Use of circuit de-emphasis ? | |
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Before modulation
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Before detection
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After detection
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After modulation
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| 5. | A DSB-SC signal can be demodulated using ? | |
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A low pass filter
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A synchronous detector
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A phase shift discriminator
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An envelope detector
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| 6. | In PCM system, if we increase the quantization levels from 2 to 8, the relative bandwidth requirements will ? | |
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Be double
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Remain same
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Be tripled
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Becomes eight times
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| 7. | A sine wave is applied to a balanced modulator. The peak output envelope power is 1000 times the minimum output envelope power. Estimate the carrier suppression in dBc ? | |
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24dBc
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40dBc
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36dBc
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30dBc
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| 8. | Delta modulation is equivalent to ? | |
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PWM
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DPCM
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PCM
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PAM
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| 9. | The effect of channel coding in communication channels is ? | |
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Reduced errors
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Increased bandwidth
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Reduced terminal size
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All of above
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| 10. | Pre-emphasis is used to ? | |
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Attenuate both high and low frequencies
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Amplify high frequencies
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Amplify both high and low frequencies
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Amplify low frequencies
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