Modulation

11. In a radio receiver, noise is generally developed at _________

1. IF stage
2. Receiving antenna
3. Audio stage
4. RF stage

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12. In a radio receiver, we generally use _________ oscillator as a local oscillator

1. Crystal
2. Wien-bridge
3. Phase-shift
4. Hartley

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13. In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________

1. The difference frequency is closer to oscillator frequency
2. Lower frequencies are easier to amplify
3. Only the difference frequency can be modulated
4. None of the above

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14. In a transmitter _________ oscillator is used

1. Hartley
2. RC phase-shift
3. Wien-bridge
4. Crystal

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15. In a TRF radio receiver, the RF and detection stages are tuned to _________

1. Radio frequency
2. IF
3. Audio frequency
4. None of the above

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16. In amplitude modulation, bandwidth is _________ the audio signal frequency

1. Thrice
2. Four times
3. Twice
4. None of the above

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17. In amplitude modulation, the _________ of carrier is varied according to the strength of the signal.

1. Amplitude
2. Frequency
3. Phase
4. None of the above

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18. In an AM wave useful power is carrier by _________

1. Carrier
2. Sidebands
3. Both sidebands and carrier
4. None of the above

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19. In an AM wave, the majority of the power is in _________

1. Lower sideband
2. Upper sideband
3. Carrier
4. None of the above

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20. In India, _________ modulation is used for radio transmission

1. Frequency
2. Amplitude
3. Phase
4. None of the above

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