The very high frequency (VHF) range extends from
Very high frequency (VHF) has a frequency range of 30-300 MHz and wavelength range of 10 to 1 m.
Match List-I (Frequencies spectrum) with List-II (Frequency range) and select the correct answer using the codes given-below the lists:
A. Extremely low frequency
B. Low frequencies
C. Voice frequencies
D. Very low frequencies
1. 30-300 kHz
2. 300-3000 Hz
3. 3-30 kHz
4. 30-300 Hz
Match List-I with List-li and select the correct answer using the codes given below the lists:
1. The process by which some characteristics of a carrier is varied by ah information signal.
2. Any undesirable change in an information signal.
3. A signal that can be modulated by an information signal.
4. A path for transmission of signal.
Correct Answer :-D
Explanation : A-4, B-3, C-1, D-2
a) Transmission channel, the path between two nodes of a network that a data communication follows. The term can refer to the physical cabling that connects the nodes on a network, the signal that is communicated over the pathway or a subchannel in a carrier frequency.
b) In telecommunications, a carrier wave, carrier signal, or just carrier, is a waveform that is modulated (modified) with an information bearing signal for the purpose of conveying information.
c) Modulation is a process by which a carrier signal is altered according to information in a message signal.
d) Distortion is any undesired change in the amplitude or phase of any component of an information signal that causes a change in the overall waveform of the signal.
The communication medium causes the signal to be
The communication medium is the channel through which the message travels from the transmitter to the receiver. During the process of transmission and reception the signal gets distorted due to noise introduced in the system.
The function of the input transducer in a communication system is
The message from the information source may or may not be electrical in nature. In a case when the message produced by the information source is not electrical in nature, an input transducer is used to convert it into a time-varying electrical signal.
Two key barriers to human communication are
Communication is the process of
Communication is simply the basic process of exchanging information.
Radio signals are made up of
Which of the following is not a major communication medium?
Correct Answer :- c
Explanation : In the communication process, a medium is a channel or system of communication—the means by which information (the message) is transmitted between a speaker or writer (the sender) and an audience (the receiver).
Wire is not a major communication medium.
In a wired network, data is transmitted over a physical medium.
Nowadays, wireless networks are being used. So wired connection is not a major communication medium.
The process of transmitting two or more information signals simultaneously over the same channel is called
Multiplexing may be defined as the process of combining several message signals together and send them over the same communication channel, i.e. FDM, TDM and CDM.