MCQ on Communication System. We covered all the MCQ on Communication System in this post for free so that you can practice well for the exam.
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Communication System Mock Test for Students
Which of the following is the disadvantage of FM over AM?
(a) Larger bandwidth requirement
(b) Larger noise
(c) Higher modulation power
(d) Low efficiency
Option a – Larger bandwidth requirement
Modulation is the process of superposing
(a) a low-frequency audio signal on high-frequency waves.
(b) low-frequency radio signal on low-frequency audio waves.
(c) high-frequency audio signal on low-frequency radio waves
(d) low-frequency audio signal on low-frequency radio waves.
Option a – a low-frequency audio signal on high-frequency waves
In amplitude modulation, the bandwidth
(a) is twice the audio signal frequency.
(b) thrice the audio signal frequency.
(c) twice the carrier wave frequency.
(d) the sum of audio signal frequency and carrier wave frequency.
Option a – is twice the audio signal frequency
In frequency modulation
(a) the amplitude of modulated wave varies with the frequency of the carrier wave.
(b) the frequency of modulated wave varies with the amplitude of the modulating wave.
(c) the frequency of modulated wave varies the frequency of as a modulating wave.
(d) the frequency of modulated wave varies as the frequency of carrier waves.
Option b – the frequency of modulated wave varies with the amplitude of the modulating wave
Which of the following device is a full duplex?
(a) Mobile phone
(b) Walky-Talky
(c) Loudspeaker
(d) Radio
Option a – Mobile phone
A modem is a
(a) modulating device only.
(b) the demodulating device only.
(c) modulating and demodulating devices.
(d) receiving device
Option c – modulating and demodulating devices
‘RADAR’ stands for
(a) Radio Detection and Ranging
(b) Ready Advanced Appliance for Ranging
(c) Range Detection Appliance for Airplane Ranging
(d) Ready Advanced Airplane Ranging
Option a – Radio Detection and Ranging
The waves used in radar systems are ……. waves.
(a) ultraviolet
(b) infrared
(c) micro
(d) radio
Option c – micro
Consider the following statements. I. Radar is used to locate, guide or identify the objects such as airplanes, ships, missiles, etc. II. TV remote is an electronic device containing an integrated circuit and a few other components. III. The loss of strength of signals during their propagation through the communication channel is referred to as noise. Which of the statements given above is/are correct?
(a) I and II
(b) Only II
(c) II and III
(d) All of these
Option a – I and II
The process of separating the audio signal from the modulated wave is called
(a) Demodulation
(b) Amplitude modulation
(c) Frequency modulation
(d) None of the above
Option a – Demodulation
Consider the following statements. I. Repeater is a combination of a receiver and a transmitter. II. The wave that results in superimposing the audio wave on the carrier wave is called a modulated wave. III. Sky waves are the AM radio waves, which are received after being reflected from the ionosphere. Which of the statement(s) given above is/are correct?
(a) Only I
(b) II and III
(c) I and III
(d) All of these
Option d – All of these
Assertion (A) Short wave bands are used for the transmission of radio waves to a large distance. Reason (R) Short waves are reflected from the ionosphere. Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option a – Both A and R are true and R is the correct explanation of A
Assertion (A) Microwave propagation is better than sky wave propagation. Reason (R) Microwaves have frequencies of 100 to 300 GHz, which have very good directional properties. Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option a – Both A and R are true and R is the correct explanation of A
…… are used for communication in artificial satellites.
(a) Infrared waves
(b) Radio waves
(c) Ultraviolet (UV) rays
(d) Amplitude Modulation (AM) waves
Option b – Radio waves
Which electromagnetic radiation is used for satellite communication?
(a) Ultraviolet
(b) Infrared
(c) Microwave
(d) Millimeter wave
Option c – Microwave
In a communication system, noise is most likely to affect the signal
(a) at the transmitter.
(b) in the channel or in the transmission line.
(c) in the information source.
(d) at the receiver.
Option d – at the receiver
An example of point to point mode of communication is
(a) FM radio
(b) Standard FM radio
(c) Television
(d) Telephony
Option d – Telephony
The waves that are bent down by the ionosphere are
(a) ground waves
(b) surface waves
(c) direct waves
(d) sky waves
Option d – sky waves
The electromagnetic waves of frequency 2MHz to 30 MHz are used ( MCQ on Communication System )
(a) in ground wave propagation.
(b) in sky wave propagation.
(c) in microwave propagation.
(d) In satellite communication.
Option b – in sky wave propagation
Through which mode of propagation, the radio waves can be sent from one place to another
(a) Ground wave propagation
(b) Sky wave propagation
(c) Space wave propagation
(d) All of the above
Option d – All of the above
We covered all the mcq on communication system above in this post for free so that you can practice well for the exam.
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