Module 1 Introduction to Communication

Why a sinusoidal signal is considered analog?

• It moves in both positive and negative direction

• It is positive for one half cycle

•     It is negative for one half cycle

• It has an infinite number of amplitudes in the range of values of the independent variable

The minimum height of antenna required for transmission in terms of ʎ is ________

• ^3ʎ⁄₂

• ^ʎ⁄₄

• 2ʎ

• ʎ

What do you understand by the term analog communication?

• A method in which one of the properties of a carrier signal varies in proportion to an instantaneous value of modulation signal

• A way for data and computer communication

• A numerical coded communication

• A suitable method for long distance communication

Data transmitted for a given amount of time is called ________

• Noise

• Power

• Frequency

• Bandwidth

Amplitude Modulation suffers from ________.

• Side-band Suppression

• IntraPulse Modulation

• Cross Modulation

• Carrier Suppression

Medium which sends information from source to receiver is called ________.

• a) Transmitter

• Transducer

• Loudspeaker

• Channel

Cell phones sent information in form of ________.

• microwaves

• electrical signals

• infrared Waves

• radio waves

What is the role of channel in communication system?

• acts as a medium to send message signals from transmitter to receiver

• converts one form of signal to other

• allows mixing of signals

• original signal from incoming signal helps to extract

Relationship between amplitude and frequency is represented by ________.

• Time-domain plot

• Phase-domain plot

• Frequency-domain plot

• Amplitude-domain plot

In TV transmission, sound signal is ________ modulated.

• Phase

• Pulse

• Frequency

• Amplitude