Elements of a communication system - class-XII
| Description: elements of a communication system | |
| Number of Questions: 27 | |
| Created by: Sharvani Hegde | |
| Tags: communication systems electromagnetic waves and communication system communication system physics |
The wave used by artificial satellites for communication is
The critical velocity of satellite of mass $100 kg$ moving round a planet is $20 m/s$. If another satellite of mass $200 kg$ is kept moving in the same orbit then its critical velocity will be:
In sky wave communication which of the frequency will be reflected back by the ionospheric layer having electron density $4 \times 10 ^ { 6 } / \mathrm { m } ^ { 3 }$
The examples of broadcast are
A) radio B) television
C) telephony D) internet
A digital signal
Statement A: If the antenna is vertical,a vertically polarised EM wave is radiated
Statement B: The vertically polarised EM wave has electrical variations in the vertical plane
An antenna serves the following purpose :
The concepts of communication are
a) mode of communication
b) need for modulation
c) types of modulation
d) detection of modulated wave
Buffer amplifier is used at the transmitting end to
The science of communication involving long distances is known as
The useful message that is conveyed during communication is known as
The term channel is used to indicate
Consider telecommunication through optical fibres. Which of the following statement is not true?
Without which of the following a generalized block diagram of communication system is incomplete?
What are the three essential part of a communication system?
Which of the following is/are the example(s) of real life telecommunication system?
In which year, the radio broadcasting had started in India?
The waves used in telecommunication are
A receiver in a communication system must have
When two or more signals share a common channel, it is called:
A complete communication system must include:
An antenna is a device that converts
Basically, a communication system is a
The collection of communication line and routers form the:
The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot ?
To double the covering range of a TV transmission tower, its height should be multiplied by :
The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot ?