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COMNAV RECIT MODULE 1 2025 UPDATED
EXAM QUESTIONS AND ANSWERS.
communication system - correct answer- a system model that describes a communication exchange between two stations
- transmitter and receiver communication - correct answer- the process of transferring the infos between two points
- transmitter
- medium
- receiver - correct answer- main elements needed to communicate:
- written
- visual
- verbal
- non- verbal - correct answer- communication can be in for of:
- source
- input transducer
- transmitter
- encoding
- modulation
- channel
- noise
- receiver
- output transducer
- destination - correct answer- components of communication system: source - correct answer- something that originates the message input transducer - correct answer- converts any form of energy into electrical signals. = system that concerts signal into electrical signal transmitter - correct answer- circuit that modifies tha inout electrical signal into a suitable form through antenna
noise - correct answer- any unwanted signals tending to interfere with other signals
- uncorrelated noise
- correlated noise - correct answer- 2 categories of noise: uncorrelated noise - correct answer- present regardless of whether there is a signal presented or not correlated noise - correct answer- usually mutually related to the signals and cannot be present unless there is a signal
- atmospheric noise (static noise)
- industrial noise
- extraterrestrial noise - correct answer- uncorrelated noise: receiver - correct answer- receives transmitted signal
demodulator - correct answer- demodulates the received signal using the demodulation technique decoding - correct answer- accepting the transmitted signals from the transmission medium demodulation - correct answer- extract the info signal from the carrier signal. = removes signal/ message output transducer - correct answer- converts electrical signal into its original form destination - correct answer- the unit to which the message is communicated modulator - correct answer- a device that performs modulation is called a _
- message signal
- carrier signal
amplitude modulation - correct answer- amplitude varies, frequency and phase is constant frequency modulation - correct answer- frequency is varied, amplitude and phase is constant phase modulation - correct answer- phase is varied, amplitude and frequency is constant communication system - correct answer- may be categorized based on physical structure and specification of signal they transmit physical structure - correct answer- type of channel used and the hardware design of the transmitting and receiving equipment signal specification - correct answer- signify the nature and type of the transmitted signal
- line communication system
- radio communication system
- simple communication channel
- half duplex channel
- full duplex channel - correct answer- based n physical structure:
- analog communication
- digital communication
- baseband communication
- carrier communication - correct answer- based on signal specification: line communication - correct answer- transmitter and receiver are connected by a physical cable = wired radio communication system - correct answer- antenna is essential part =wireless
- more complex - correct answer- characteristics of wireless communication: analog communication - correct answer- communicates data as electronic signals of varying frequency or amplitude = broadcast and telephone transmission digital communication - correct answer- stores and transmits data in form of 1s and 0s = efficient communication = used binary codes baseband communication - correct answer- transfer of signals that are not amplified to higher frequency = near zero frequency carrier communication system - correct answer- transfer info esp voice message and calls by imrpoving the frequency = high frequency group 1: line/ radio communication
group 2: simplex/ duplex communication group 3: analog/ digital communication group 4: baseband/ carrier communication - correct answer- 4 groups of communication system: attenuation - correct answer- reduction of the strength of signal amplitude - correct answer- the strength of the signal amplification - correct answer- signal is being strengthen bandwidth - correct answer- range of frequency over which a signal has been transmitted repeater - correct answer- extends the range of communication system by amplifying signals
