Telecommunications Quiz: OSI Models and Modulation Techniques

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Questions and Answers

What is the primary purpose of wavelength division multiplexing (WDM)?

To use different codes for each user

To divide the time among multiple users

To share the same frequency among multiple users

To assign different wavelengths to each user (correct)

What is the purpose of synchronization in data communication?

To align data frames at the receiver (correct)

To increase data transmission speed

To encrypt data for secure transmission

To reduce signal distortion

What is the main purpose of amplitude modulation in communication systems?

To improve signal clarity (correct)

To increase signal frequency

To reduce signal bandwidth

To eliminate noise

In a 6cm x 3cm waveguide, what is the cut-off wavelength of the dominant mode of operation?

3cm Signup and view all the answers

Which category of data communication protocols is responsible for ensuring reliable and error-free delivery of data?

Transport Layer Protocols Signup and view all the answers

In Phase Shift Keying (PSK), how is digital information typically represented?

By varying the phase of the carrier Signup and view all the answers

What is the communication system parameter that is inversely proportional to the impact of noise?

Signal-to-noise Ratio Signup and view all the answers

What is the primary purpose of a hub in a network?

To connect devices in a star topology Signup and view all the answers

What determines the color of light emitted by an LED?

Type of semiconductor material Signup and view all the answers

What is the primary characteristic of impulse noise in communication systems?

Random occurrence Signup and view all the answers

What is the minimum sampling rate required to avoid aliasing for a continuous-time signal x(t) = 5cos(400πt)?

800Hz Signup and view all the answers

In an AM transmitter modulated by two audio tones, what is the effect of increasing the modulation depth?

Increases the sideband power Signup and view all the answers

What is the approximate bandwidth of an FM signal modulated by a 15-kHz tone with a frequency deviation of 45 kHz?

180 kHz Signup and view all the answers

What is the primary purpose of a repeater in a communication system?

To amplify signals Signup and view all the answers

What is the fundamental period 'T' of the signal pi(t) = 2cos(t/4)?

4π Signup and view all the answers

What is a significant disadvantage of analog communication systems compared to digital communication systems?

Greater susceptibility to noise Signup and view all the answers

What type of sensor is commonly used in HVAC systems to measure air temperature?

Thermistor Signup and view all the answers

What is the primary difference between FDM and FDMA?

FDM divides frequencies, while FDMA allows different users to transmit on different frequencies simultaneously Signup and view all the answers

How is timing maintained between sender and receiver in synchronous data transmission?

Using a clock signal Signup and view all the answers

What type of circuit is commonly used for long-distance communication, such as telecommunication networks?

Four-wire Signup and view all the answers

What is the characteristic feature of a broadband communication system?

High data transmission rates Signup and view all the answers

What is the set of all values of z for which X(z) attains a finite value?

Region of Convergence Signup and view all the answers

What is the standard intermediate frequency for the FM radio?

10.7 MHz Signup and view all the answers

What is the approximate power level required using the H3E for reliable communication over a certain path, if a transmitter power of 100 W is sufficient using the SSB?

300 W Signup and view all the answers

What is the measure of distribution of radiated power over a given area?

Power Density Signup and view all the answers

Which transmission mode is commonly used for voice communication between two users in a telephone system?

Full-Duplex Signup and view all the answers

What determines the selectivity of a radio receiver?

Bandwidth Signup and view all the answers

What is the ratio of the effective earth radius to the true earth radius?

K Factor Signup and view all the answers

Which of the following statements is correct for convolution?

The convolution of an odd and even function is an odd function Signup and view all the answers

Which modulation technique is commonly used in digital audio broadcasting?

Pulse Code Modulation (PCM) Signup and view all the answers

Study Notes

Communication Systems

The primary purpose of wavelength division multiplexing (WDM) is to assign different wavelengths to each user.

Modulation Techniques

Amplitude modulation (AM) is used to reduce signal bandwidth and improve signal clarity.
Phase Shift Keying (PSK) represents digital information by varying the phase of the carrier signal.
Frequency Shift Keying (FSK) typically represents digital information by varying the frequency of the carrier signal.

Data Communication

Synchronization in data communication is used to align data frames at the receiver.
The transport layer protocols are responsible for ensuring reliable and error-free delivery of data.

Network Configuration

A hub is used to connect devices in a star topology.
A metropolitan area network (MAN) typically covers a larger geographic area compared to a local area network (LAN) but smaller than a wide area network (WAN).

Electromagnetic Waves

The color of light emitted by an LED depends on the type of semiconductor material.

Noise in Communication Systems

Impulse noise is characterized by random occurrence.
The primary characteristic of broadband communication systems is high data transmission rates.

Radio Wave Propagation

Ground wave propagation is most influenced by the earth's surface.

Digital Modulation Techniques

Phase Shift Keying (PSK) is commonly used for transmitting digital data over a noisy communication channel.

Transmission Line

The velocity of a transmission line determines the capacitance and inductance per meter of the line.

Convolution

The convolution of an odd and even function is an odd function.

Digital Communication Systems

The key advantage of digital communication systems over analog communication systems is greater resistance to noise.

Multiple Access Techniques

Code Division Multiple Access (CDMA) uses different codes for each user.

Building Security

The purpose of an access control system is to control access to a building or area.

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Description

Test your knowledge of telecommunications concepts, including OSI models, modulation techniques, and wavelength division multiplexing. Review and verify your answers to improve your understanding of these important topics.