MEDIUM
12th West Bengal Board
IMPORTANT
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Define modulation index and it's ratio.

Important Questions on Communication System

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 8
Why is the amplitude of modulating signal kept less than the amplitude of carrier wave?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 9

Write two factors justifying the need of modulation for transmission of an audio signal.

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 10
What does the term LOS communication mean? Name the type of waves that are used for this communication. Which of the two, height of transmitting antenna and height of receiving antenna, can affect the range over which this mode of communication remains effective?
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 11
Why is communication using line of sight mode limited to frequencies above 40 MHz?
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 12
What is range of frequencies in satellite communication? What is common between these waves and light waves?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 13

Briefly answer the following questions: 
1. What is a digital signal?
2. Explain the function of modem in data communication.
3. Write two advantages of digital communication.

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 14

The diagram given below Fig. represents the block diagram of a generalised communication system. Identify the elements, labelled X  in this diagram. Explain the function of each of these element.

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HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 15
What is space wave propagation? Which two communication methods makes use of this method of propagation? If the sum of the heights of transmitting and receiving antennas in line of sight of communication is fixed at h, show that the range is maximum when the two antennas have a height h2 each.