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NEET - Grade 12 - Physics - Communication Systems - Introduction and Snapshot of Communication Systems - Study ref# 848

Introduction: Communication is the act of transmission of information. Everyday living creature in the world experiences the need to impart or receive information almost continuously with others in the surrounding world. For communicat... read more

NEET - Grade 12 - Physics - Communication Systems - Introduction and Snapshot of Communication Systems - Study ref# 849

Following sections must be covered to understand the Communication System: 1. Introduction 2. Elements of a Communication System 3. Basic Terminology Used in Electronic Communication Systems 4. Bandwidth of Signals 5. Bandwidt... read more

NEET - Grade 12 - Physics - Communication Systems - Target Setup for Communication Systems - Study ref# 850

Student requires to achieve the following milestones to get better grip over Communication System. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Te... read more

NEET - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10595

Why are microwaves considered suitable for radar systems used in aircraft navigation? Answer: Due to their short wavelength Detailed Answer: Microwaves are considered good for radar systems used in aircraft navigation as these wave hav... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10722

Which mode of propagation is used by short wave broadcast service? Answer: Sky wave propagation is used in short wave broadcast service. Its frequency range is form few MHz upto 40 MHz.... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10723

Name the essential components of a communication system. Answer: Transmitter, Medium or Channel and Receiver.... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10724

Why are microwaves considered suitable for radar systems used in aircraft navigation? Answer: Due to their short wavelengths, they are suitable for radar system used in aircraft navigation.... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10725

What is the meaning of the term ‘attenuation’ used in communication system? Answer: Attenuation is the loss of strength of a signal, while propagating through a medium.... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10726

Give one example of point – to-point communication mode. Answer: Telephony service is based upon point to point communication.... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10727

How does the effective power radiated from a linear antenna depend on the wavelength of the signal to be transmitted? Answer: Effective power   Alternatively, The effective power which is ... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10728

Draw a block diagram of a generalized communication system. Answer: ... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10729

(i) What is line of sight communication? (ii) Why is it not possible to use sky waves for transmission of TV signals? Upto what distance can a signal be transmitted using an  antenna of height ‘h’? Answer: (i) Communication, using waves whi... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10730

Which basic mode of communication is used in satellite communication? What type of wave propagation is used in this mode? Write, giving reason, the frequency range used in this mode of propagation. Answer: Broadcast/point to point, mode of ... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10731

Distinguish between a transducer and a repeater. Answer: Transducer: A device which converts one form of energy into another. Repeater: A combination of receiver and transmitter. It picks signals from a transmitter; amplifies and re... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10732

Distinguish between broadcast mode and point-to-point mode of communication and give one example for each. Answer: In point-to-point communication mode, communication takes place over a link between a single transmitter and a single receiver... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10733

State the concept of mobile telephony and explain its working. Answer: Concept of mobile telephony is to divide the service area into a suitable number of cells centered on an office MTSO (Mobile Telephone Switching Office). Mobile telephony... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10734

What is space wave propagation? Which systems of communication use space waves? What is ‘radio horizon’ of transmitting antenna of height h? Why is space wave propagation suitable for frequencies above 40 MHz? Answer: Propagation of waves, a... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10735

Draw a block diagram of a generalized communication system. Write the functions of each of the following: (i) Transmitter (ii) Channel (iii) Receiver Answer: [Also accept the following diagram   (i) Transmitter: A... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10736

What is global positioning system? Explain its working in brief. Answer: Global Positioning System (GPS) is method of identifying location or position of any point or a person on earth using a system of 24 satellites, which are continuously ... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10737

What is space wave propagation? State the factors which limit its range of propagation. Derive an expression for the maximum line of sight distance between two antennas for space wave propagation. Answer: Space Wave Propagation: The mo... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10738

A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. What are the frequencies of the side bands produced? Answer:                 = 2005kHz; 1995 kHz... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10739

How are side bands produced? Answer: Side bands are produced due to the superposition of carrier waves of frequency  over modulating /audio signal of frequency  .... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10740

A carrier wave of peak voltage 12 V is used to transmit a message signal. Calculate the peak voltage of the modulating signal in order to have a modulating index of 75%. Why is modulation index generally kept less than one? Answer:     ... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10741

Define modulation index. Why it is kept low? What is the role of a bandpass filter? Answer: The modulation index is ratio of modulating signal voltage  to the carrier voltage .  . It is... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10742

In the block diagram of a simple modulator for obtaining an AM signal, shown in the figure, identify the boxes A and B. Write their functions. Answer: A = Square law device. B = Bandpass filter. Band pass filter rejects low and high f... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10743

Define the term ʹamplitude modulationʹ. Explain any two factors which justify the need for modulating a low frequency base band signal. Answer: It is the process of superposition of information / message signal over a carrier wave ... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10744

(i) How is amplitude modulation achieved? (ii) The frequencies of two side bands in an AM wave are 640 kHz and 660 kHz respectively. Find the frequencies of carrier and modulating signal. What is the bandwidth required for amplitude modul... read more

NEET - Grade 12 - Physics - Communication Systems - Study ref# 10745

A sinusoidal carrier wave of amplitude   and angular frequency   is modulate in accordance with a sinusoidal information signal of amplitude   and angular frequency . Show that the amplitude modulated signal contains three frequencies cen... read more

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