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Electronics and Communications

19. 

Several channels are interleaved and then transmitted together is known as

A. transmitter-division multiplex B. time-division multiplex C. frequency-division multiplex D. all the above

Answer : C. frequency-division multiplex

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20. 

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

A. balanced modulator B. third method C. filter system D. phase-shift method

Answer : A. balanced modulator

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21. 

Which of the following is called intrinsic semiconductor?

A. Pure semiconductors B. P-type semiconductor C. n-type semiconductor D. metallic conductor

Answer : A. Pure semiconductors

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22. 

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

A. p-n junction B. p-n junction diode C. zero bias p-n junction diode D. all the above

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?

A. in the information source B. in the channel C. at the destination D. at the transmitter

Answer : B. in the channel

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24. 

Indicate the false statement. Modulation is used to

A. separate differing transmissions B. reduce the bandwidth used C. allow the use of practicable antennas D. ensure that intelligence may be transmitted over long distances

Answer : B. reduce the bandwidth used

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