Question

1. The technique sometimes used to      make an information signal compatible with the medium over which it is      being transmitted is called? Modulation

2. What is the name given to undesirable      interference that is added to a signal being transmitted? Noise

3. Name the technique used to      extract multiple intelligence signals that have been transmitted      simultaneously over a single communication channel. Multiplexing

4. In the electromagnetic wave      spectrum, the frequency of radio waves ranges from ……… to ………KHz

5. ……………………………………… use amplifying      devices such as transistors and operational amplifiers

6. A test instrument known as a      …………………… is used to display the frequency domain of a signal.

7. The carrier frequency remains      constant during AM. TRUE / FALSE?

8. Name the type of AM used in TV      picture transmission. Why is it used?

9. What is the name given to the      process of frequency modulation of a carrier by binary data?

10. An imaginary line called the      ……………………………. connects the positive and negative peaks of the carrier      waveform.

11. Give two examples of antenna      array.

12. When a 400-Hz tone modulates a      300-kHz carrier. The upper and lower sidebands are, USB=….. and LSB=……….      Respectively.

13. The amount that the carrier      varies from its unmodulated center frequency during modulation is called?

14. What is the basic makeup of a      radio wave? Describe the relationship between the types of fields that      make up a radio wave. What is the orientation of these fields with respect      to the transmission direction of the wave?

15. A signal is expressed as      V=200sint. At a particular time of the day, the frequency and peak voltage      are…………… and …………… respectively.

16. ………… is the variation in signal      amplitude at the receiver caused by the characteristics of the signal path      and changes in it.

17. What is the general name given      to both FM and PM?

18. A commonly used frequency range      is 902 MHz to 928 MHz. How wide is the band?

19. Attenuation refers to a loss      introduced by a circuit or component. TRUE/FALSE

20. What happens when modulation      index is greater than 1?

 

Answer 1

Q1 answer:

The baseband signals are incompatible for direct transmission. There is a need to impress the information signal on high frequency carrier signal to make it to travel long distances along the given medium. The process is known as modulation.

Hence, Modulation is the technique is used to make an information signal compatible with the medium over which it is being transmitted.