| 1. | In amplitude modulation AM, if modulation index is more than 100% then ? | |
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Power of the wave increases
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Efficiency of transmission increases
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The wave gets distorted
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Band with increases
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Report Question| 2. | Number of ‘side bands’ produced during A.M ? | |
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One
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Two
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Four
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unlimited
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| 3. | In frequency modulation: ? | |
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Carrier signal amplitude varies with the amplitude of modulating signal
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Carrier signal amplitude varies with the frequency of modulating signal
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Carrier signal frequency varies with the frequency of modulating signal
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Carrier signal frequency varies with the amplitude of modulating signal
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| 4. | In frequency modulation ? | |
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Carrier signal frequency varies with the amplitude of modulating signal
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Carrier signal amplitude varies with the frequency of modulating signal
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Carrier signal amplitude varies with the amplitude of modulating signal
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Carrier signal frequency varies with the frequency of modulating signal
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| 5. | As the modulation index of an FM signal with sinusoidal modulation is increased from zero to two, the power in the carrier component will ? | |
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Decrease continuously
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Increase continuously
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First increase, becomes zero and then decrease
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First decrease, become zero and then increase
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| 6. | VSB modulation is preferred in TV because ? | |
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If reduces the bandwidth requirement to half
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If avoids phase distortion at low frequencies
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If results in better reception
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None of the other options
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| 7. | Which of the following statement is correct ? | |
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Bandwidth of FM signal is equal to AM signal
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Bandwidth of FM signal can be more or less than AM signal
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Bandwidth of FM signal is lesser than AM signal
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Bandwidth of FM signal is larger than AM signal
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| 8. | Which of the following modulation scheme is most band width efficient ? | |
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Am
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FM
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PM
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SSB-SC
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| 9. | With increase in modulation index: ? | |
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Transmitted power increases in both FM and AM
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Transmitted power decreases in both FM and AM
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Transmitted power remain constant in FM but increases in AM
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Transmitted power remain in AM but increases in FM
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| 10. | A balanced modulator is used for generation of which of the following ? | |
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DSB-SC signal
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FM signal
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PM signal
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PAM signal
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