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Electronics and Communications


19. 

Several channels are interleaved and then transmitted together is known as

Answer : C. frequency-division multiplex

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20. 

Which of the following cannot be used to remove the unwanted sideband in SSB?

Answer : A. balanced modulator

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21. 

Which of the following is called intrinsic semiconductor?

Answer : A. Pure semiconductors

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22. 

The p-n junction diode in which no voltage is applied is called ________

Answer : C. zero bias p-n junction diode

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23. 

In a communications system, noise is most likely to affect the signal?

Answer : B. in the channel

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24. 

Indicate the false statement. Modulation is used to

Answer : B. reduce the bandwidth used

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