| 1. | In phase modulation, phase deviation is proportional to ? | |
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Carrier phase
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Message signal
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Carrier amplitude
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Message signal frequencies
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Report Question| 2. | Capture effect is a characteristic of ? | |
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AM system
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FM system
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PCM system
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TDM system
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| 3. | A spectrum analyses is a device to ? | |
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Display waveform of the signal
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Read highest frequency component of the signal
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Display all frequency components of the input signal along with their amplitude
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Measure electrical signal
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| 4. | An audio frequency of 15 KHz is frequency modulated with a deviation of 75 KHz the resulting bandwidth is ? | |
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180 KHz
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150 KHz
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210 KHz
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240 KHz
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| 5. | In FM modulation system, the number of significant sideband depends on ? | |
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Modulation voltage
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Modulation frequency
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The frequency deviation
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Modulation index
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| 6. | In frequency modulation. If the amplitude of the modulating signal decreases, the carrier frequency ? | |
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Decreases
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Increased
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Is zero
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Remains content
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| 7. | In case of which of the following, an increase on the modulation index leads to increase in bandwidth ? | |
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PM
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FM
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AM
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Both A. and B.
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| 8. | The modulated carrier average power in an FM system is equal to the ? | |
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Modulating signal power
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Sum of the modulated signal power and the un modulated carrier power
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Difference between the modulating signal power and the unmodulated carrier power
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Unmodulated carrier power
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| 9. | A FM wave is given in v = 12 sin ( 6 x 108t +5 sin 1250 t ). Its carrier frequency is ? | |
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60.0 MHz
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95.5 MHz
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125.0 MHz
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276.3 MHz
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| 10. | Which of the following statement is correct ? | |
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The frequency of carrier signal depends on frequency of modulating signal
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The frequency of carrier signal is lower than that of modulating signal
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The frequency of carrier signal and modulating signal are equal
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The frequency of carrier signal is very high compare to that of modulating signal
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