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Which of following four alternatives is ...

Which of following four alternatives is not correct? We need modulation:

A

to reduce the size of the antenna

B

to reduce the fractional bandwidth , that is ratio of the signal bandwidth to the centre frequency

C

to increases the selectivity

D

to reduce the time lag between transmission and reception of the information signal

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The correct Answer is:
A
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AAKASH SERIES-COMMUNICATION SYSTEM -LECTURE SHEET (LEVEL - I) (MAIN) (EXERCISE - III) (Straight Objective & More than one Correct Answer Type Questions)
  1. Which of following four alternatives is not correct? We need modulatio...

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  2. In frequency modulation

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  3. The frequency of a FM transmitter without signal input is called

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  4. The AM wave of equivalent to the summation of

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  5. The AM wave contans three frequencies viz:

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  6. In AM wave the amplitude of each side hand frequency is

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  7. In AM wave, carrier power is given by-

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  8. In AM wave total power of side bands is given by :

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  9. Fraction of total power carried by side bands is given by-

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  10. Modulation factor determines-

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  11. if the maximum and minimum voltage of AM wave are V(max) and V(min), r...

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  12. When m=1 ,power carried by side bands is:

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  13. Which of the following is/are the limitations of amplitude modulation?

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  14. Degree of modulation-

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  15. A signal wave of frequency 12KHz is modulated with a carrier wave of f...

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  16. The antenna current of an AM transmitter is 8A when only the carrier i...

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  17. A 1kW signal is transmitted using a communication channel which provid...

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  18. A speech signal of 3 KHz is used to modulate a carrier signal of frequ...

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  19. A message signal of frequency omega(m) is superposed on a carrier wave...

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  20. 1-V characteristics of four devices are shown in figure. Identif...

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