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In amplitude modulation...

In amplitude modulation

A

amplitude remains constant but frequency changes

B

both amplitude and frequency do not change

C

both amplitude and frequency change

D

amplitude of the carrier wave changes according to information signal

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The correct Answer is:
D
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TARGET PUBLICATION-COMMUNICATION SYSTEMS-Competitive Thinking
  1. Identify the incorrect statement from the following

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  2. Amplitude modulation has

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  3. In amplitude modulation

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  4. In frequency modulation

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  5. In amplitude modulation, the bandwidth is

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  6. Choose the correct statement:

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  7. In amplitude modulation, sinusoidal carrier frequency used is denoted ...

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  8. A carrier wave of peak voltage 12 V is used to transmit a message sign...

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  9. A single of 5 kHz frequency is amplitude modulated on a carrier wave o...

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  10. The amplitude of carrier wave is 12 . For modulation index of 50% th...

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  11. The audio signal used to modulate 60 sin (2pixx10^(6)t) is 15 sin 300 ...

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  12. A message signal of 12 kHz and peak voltage 20 V is used to modulate a...

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  13. An oscillator is producing FM waves of requency 2kHz with a variation ...

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  14. When carrier wave of 2 . 5 MHz frequency is amplitude modulated, the ...

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  15. The equation of an FM signal is e = 6 sin (10^(6) t + 4 sin 10^(3) t )...

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  16. The distance of coverage of a transmitting antenna is 12 . 8 km . Then...

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  17. If a transmitting antenna of height 105 m is placed on a hill, then it...

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  18. A ratio has a power of 1 kW and is operating at a frequency of 10 GHz ...

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  19. Height of T .V . Tower is h(T) . The area of transmission of T . V . W...

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  20. In an amplitude modulated wave for audio frequency of 500 "cycle"//sec...

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