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1-V characteristics of four devices are ...

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

Identify devices that can be used for modulation

A

(i) and (iii)

B

only (iii)

C

(ii) and some region of (iv)

D

all the devices can be used

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The correct Answer is:
C
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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. In AM wave, carrier power is given by-

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

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

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  4. Modulation factor determines-

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

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

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

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  8. Degree of modulation-

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

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

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

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

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

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  14. 1-V characteristics of four devices are shown in figure. Identif...

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  15. A male voice after modulation transmission sounds like that of a femal...

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  16. Identify the mathematical expression for amplitude modulated wave.

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  17. Audio sine waves of 3 kHz frequency are used to amplitude modulate a c...

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  18. The frequency response curve (figure) for the filter circuit used for ...

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  19. In amplitude modulation, the modulation index m, is kept less than or ...

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  20. An amplitude modulated wave is as shown in Fig. Which of the foll...

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