Multiple Choice Questions and Answers on Mobile Communication – Electronics Post

5/24/20 /2017

Mult Multip iple le Cho Choice ice Questio stion ns and Answe swers on Mob Mobile Commu Commun nica icatio tion – Elect lectro ron nics ics Post

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Multiple Choice Questions and Answers on Mobile Communication MULTIPLE MUL TIPLE CHOICE QUESTIONS AND ANSWERS

Categories ៝ Amplier (10) Amplitude Modulation (18) Angle Modulation (3) Basic Electrical Engineering (1) Big Data (2) Blogging (1) Boolean Logic (2) Capacitors (2)

Amplitude modulation Frequency modulation ASK FSK

Career Advice (4) Combinational Circuit (7) Communication (4) Computer Networking (73) Conversion Rate Optimization (2) Converters (1) CRO (5)

៝ Crystal Diode Rectier (1) DC-DC Converters (2) Diac (1)

៝ Differential Amplier (1) Digital multiplexing (1)

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Edwin Armstrong Albert Einstein Galileo Galilei David Bohm

Electric Current and Ohm's Law (1) Electronics and Communication Engineering Questions and Answers (2) Electronics Instruments (1) Electronics Questions and Answers (18) Filter Circuits (9) Founder Speaks (3) Integrated Circuits (7) Logic circuits (1)

Simplex mode Half duplex mode Full duplex mode None of the above

Logic Gates and Boolean Algebra (10) Long Questions and Answers (3) Multiple Choice Questions and Answers (44) Number System (1) ៝ Operational Amplier (3) Oscilloscopes (2) Popular (3)

Digital Eu ropean Cellular Telex Telex Digitized Emergency Cellular Telephone Telephone Digital Eur opean Cordless Telephone Digital E uropean Cellular Telephone

Product Reviews (1) ៝ Rectier (2) Relay (2) Resistors (3) SCR (3) Semiconductor (4) Semiconductor Diode (3) Sequential Circuit (3) Short Questions and Answers (15) Signal Processing (3) Sinusoidal Oscillator (3)

Nippon Telephone and Telegraph (NTT)

Special Purpose Diodes (1)

Bellcore and Motorola

Switching Circuits (2) Tech (16) Tech News (2)


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Edwin Armstrong Albert Einstein Galileo Galilei David Bohm

Electric Current and Ohm's Law (1) Electronics and Communication Engineering Questions and Answers (2) Electronics Instruments (1) Electronics Questions and Answers (18) Filter Circuits (9) Founder Speaks (3) Integrated Circuits (7) Logic circuits (1)

Simplex mode Half duplex mode Full duplex mode None of the above

Logic Gates and Boolean Algebra (10) Long Questions and Answers (3) Multiple Choice Questions and Answers (44) Number System (1) ៝ Operational Amplier (3) Oscilloscopes (2) Popular (3)

Digital Eu ropean Cellular Telex Telex Digitized Emergency Cellular Telephone Telephone Digital Eur opean Cordless Telephone Digital E uropean Cellular Telephone

Product Reviews (1) ៝ Rectier (2) Relay (2) Resistors (3) SCR (3) Semiconductor (4) Semiconductor Diode (3) Sequential Circuit (3) Short Questions and Answers (15) Signal Processing (3) Sinusoidal Oscillator (3)

Nippon Telephone and Telegraph (NTT)

Special Purpose Diodes (1)

Bellcore and Motorola

Switching Circuits (2) Tech (16) Tech News (2)


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AT&T Bell Laboratories Qualcomm

Transistor (10) Triac (1) Uncategorized (6) VLSI Design (5) Voltage Regulator (11) Waveform coding techniques (2) Zener Diode (1)

Simplex systems Half duplex systems Full duplex systems None of the above

Send numeric messages Send alphanumeric messages Voice message All of the above a bove

Transmitter Receiver Transceiver None of the above


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of Infra red < 100 MHz < 1 GHz < 2 GHz

Communication in single direction Communication in single direction at a time Communication in both directions at the same time None of the above

Mobile Identication Number Mobile Internet Mobility In Network None of the above


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MSC Roamer Hand off Forward channel

Wireless concept of making calls For receiving calls Irrespective of the location of the user All of the above a bove

Pager Cordless Low earth orbit satellites All of the above a bove

TDMA/FDD CDMA/FDD


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Multiple Choice Questions and Answers on Mobile Communication – Electronics Post

Digital modulation formats All of the above

TDMA CDMA Both a & b None of the above

8 users 64 users 32 users 116 users

Limited internet browsing Short Messaging Service Both a & b None of the above

https://electronicspost.com/m ultiple-choice-questions-and-answers-on-mobile-com munication/

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1.25 MHz 200 KHz 30 KHz 300 KHz

UMTS DECT DCS-1800 ETACS

TDMA FDMA TDD FDD

5MHz 2MHz https://electronicspost.com/m ultiple-choice-questions-and-answers-on-mobile-com munication/

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500KHz 100KHz

5 MHz 50 MHz 1.25 MHz 4 MHz

5, 7 7, 5 2, 5 5, 2

Assigning different group of channels Using transmitters with different power level

https://electronicspost.com/m ultiple-choice-questions-and-answers-on-mobile-com munication/

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Using different antennas All of the above

Increase in radio spectrum Increasing the number of base stations & reusing the channels Both a & b None of the above

Circular Square Oval Hexagon

It uses the maximum area for coverage Fewer number of cells are required https://electronicspost.com/m ultiple-choice-questions-and-answers-on-mobile-com munication/

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It approximates circular radiation pattern All of the above

Sectored directional antennas Omni directional antennas Yagi uda antennas None of the above

The trafc carried by whole network The trafc carried per cell divided by the bandwidth of the system and the area of a cell Expressed in Erlang /MHz /km2 Both b and c Both a and c

Increased capacity Limited spectrum is required Same spectrum may be allocated to other https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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network All of the above

Fixed Dynamic Regular Both a and b Both b and c

Gets transferred to another cell Gets blocked Is kept on waiting All of the above

Each cell is assigned a predetermined set of frequencies The call is served by unused channels of the cell https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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The call gets blocked if all the channels of the cell are occupied All of the above

Voice channels are not permanently assigned The serving base station requests for a channel from MSC MSC allocates the channel according to the predetermined algorithm All of the above

Blocking is reduced Capacity of the system is increased Both a & b None of the above

https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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More storage required Calculations and analysis is increased Both a & b None of the above

True False

Process of transferring the call to the new base station Transfers the call New channel allocation is done All of the above

Week signal conditions High trafc conditions Un availability of the channel All of the above https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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When mobile station moves in two cellular systems with different MSC When mobile station moves between two cellular systems When mobile station receives more power from other base station than the serving base station All of the above

Guard channel concept Fixed channel assignment Dynamic channel assignment None of the above

Providing Guard channel Queuing of handoffs Both a & b None of the above


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A call within the cell Hand off Waiting for channel allocation None of the above

Interference Distance between the subscriber and the base station Propagation of call All of the above

The power received by the mobile station from other base station is more than the serving base station The channel allocated is not available The mobile station has no signal All of the above


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Faster handoffs Suitability for frequent handoffs MSC need not monitor the signal strength All of the above

Termination of a call Spectrum unavailability Accommodating large number of users in limited spectrum All of the above

The user is blocked The access to the system is denied The queue may be provided All of the above


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Uses large and small cells Uses different antenna heights Is used for high speed users with large coverage area and low speed users with small coverage area All of the above

Two base stations operating in same frequency band Two calls in progress in nearby mobile stations Leakage of energy signals by non cellular systems into cellular frequency band All of the above

Cross talk Missed calls Blocked calls All of the above


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Radius of the cell Distance between the centers of the co channel cells Frequency allocation of nearest cells Both a and b Both b and c

Better transmission quality Larger capacity Low co-channel interference Both a and c Both a and b

Accommodating large number of users in limited spectrum Ability of a user to access trunked system during busy hour Two calls in progress in nearby mobile stations High speed users with large coverage area


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Erlangs /MHz /km2 Erlangs / λ

sec

dB/sec

Splitting Sectoring Coverage zone approach All of the above

Transmitters of mobile systems Transmitters of base stations Inputs and outputs of repeaters Receivers of mobile stations

Focusing radio energy towards ground Decreasing the strength of antenna Decreasing the S/N ratio at the antenna https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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input All of the above

1. Geometry of the object 2. Polarization of the incident wave 3. Amplitude of the incident wave 4. Frequency of the incident wave 1 and 2 are correct 1, 2 and 3 are correct 2 and 3 are correct All are correct

Reection Refraction Diffraction None of the above


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1. Polarization of the wave 2. Properties of the material at which reection occurs 3. Angle of incidence of wave 1 and 2 are correct 1 and 3 are correct All the three are correct 2 and 3 are correct

Wave is partially reected and partially transmitted All incident energy is reected back without loss of energy Part of energy gets absorbed Both a and c

No reection occurs at the rst medium Reection coefcient is zero The wave gets refracted in the direction of source Both a and b Both a and c https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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1. Multi path propagation 2. Obstacles 3. Frequency variations at the source 4. Variation in amplitude and phase at receiver 1 and 2 are correct 1, 2 and 4 are correct 2 and 3 are correct All are correct

Time required to attain a call with the busy base station Time required for synchronization between the transmitter and the receiver Minimum time for change in magnitude and phase of the channel None of the above


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Fading due to large obstructions Large coherence time of the channel as compared to the delay constraints Small coherence time of the channel as compared to the delay constraints Both a and b Both a and c

1. Strong destructive interference 2. Drop in signal to noise ratio 3. Temporary failure of message transfer 1 and 2 are correct 1 and 3 are correct 2 and 3 are correct All are correct

Signal fading due to Doppler shift in the channel Temporary failure of message transfer Large coherence time of the channel as compared to the delay constraints All of the above


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1. Is an expression for noise power 2. Is a function of transmitting and receiving antenna gain 3. Depends upon the distance between transmitting and receiving antenna 1 and 2 are correct 1 and 3 are correct 2 and 3 are correct All are correct

1. Unobstructed line of sight between the transmitter and receiver 2. Satellite communication systems and Microwave line of sight radio links 3. Propagation along the ground surface 1 and 2 are correct 1 and 3 are correct 2 and 3 are correct All the three are correct


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1. Received power falls with square of the distance between the transmitter and receiver 2. Increases with square of the distance between the transmitter and receiver 3. Received power increases with gains of transmitting and receiving antennas 1 and 2 are correct 1 and 3 are correct All the three are correct 2 and 3 are correct

1. Effective Isotropic Radiated Power 2. Maximum radiated power available by the transmitter 3. A factor of power and gain of transmitter 1 and 2 are correct 1 and 3 are correct All the three are correct 2 and 3 are correct


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1. PN sequence for modulation 2. Large bandwidth 3. Multiple users 1 and 2 are correct 1 and 3 are correct 2 and 3 are correct All the three are correct

Correlator Adder Frequency divider PLL

Same spectrum and same PN code Same spectrum and different PN code Different spectrum and different PN code Different spectrum and same PN code


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1. Interference rejection capability 2. Frequency planning is not required 3. Resistance to multipath fading 4. ISI is lesser 1 and 2 are correct 1, 2 and 3 are correct 2 and 3 are correct All the four are correct

DPSK FSK ASK QPSK

More than one frequency hop during each symbol Hopping rate greater than or equal to information symbol rate One or more symbols transmitted between frequency hops https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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Both a and b Both b and c

One or more symbols transmitted in time interval between frequency hops More than one frequency hop during each symbol Hopping rate greater than or equal to information symbol rate Both a and c are correct

Noise developed at the receiver Number of bit errors during transmission Signal to noise ratio All of the above

FSK ASK https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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BPSK QPSK

Training Tracking Modulation Both a and b All a, b and c are correct

1. Equalizer algorithm 2. Equalizer structure 3. Rate of change of multipath radio channel 4. Amplitude of signal 1 and 2 are correct 1, 2 and 3 are correct 2 and 3 are correct All the four are correct


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FIR lter Lattice lter Low pass lter Both a and b Both a and c

Transversal lter Lattice lter Low pass lter None of the above

a. Decision Feedback Equalization b. Maximum Likelihood Symbol Detection c. Maximum Likelihood Sequence Estimation 1 and 2 are correct 1, 2 and 3 are correct 2 and 3 are correct None of the above


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1. Rate of convergence 2. Computational complexity 3. Numerical properties 4. Frequency change 1 and 2 are correct 1, 2 and 3 are correct 2 and 3 are correct All are correct

Number of operations for one iteration of algorithm Inaccuracies in the mathematical analysis Noise produced during one complete iteration of algorithm All of the above

1. Zero forcing algorithm 2. Least mean squares algorithm https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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3. Recursive least squares algorithm 1 and 2 are correct 1, 2 and 3 are correct 2 and 3 are correct None of the above

Matched lter Equalizer Demodulator Both a and b All a, b and c are correct

Transmitter Receiver Transmitter and receiver Communication channel

1. Time diversity 2. Frequency diversity


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3. Space diversity 4. Polarization diversity 1 and 2 are correct 1, 2 and 3 are correct 2 and 3 are correct All the four are correct

Multiple versions of signals are transmitted at different time instants The signal is transmitted using multiple channels Signal is transmitted with different polarization All of the above

1. Several sub receivers 2. Several correlators 3. Fingers 4. Equalization based 1 and 2 are correct 1, 2 and 3 are correct


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2 and 3 are correct All the four are correct

Correlator, estimation of transmitted signal, demodulation, bit decision Estimation of transmitted signal, correlator, demodulation, bit decision Estimation of transmitted signal, demodulation, correlator, bit decision Estimation of transmitted signal, demodulation, bit decision, correlator

Frequency band of the channel Range of the time delays Range of noise All of the above


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Signal compression techniques Frequency of signal Bandwidth of the signal All of the above

Speech coders Modulation technique Frequency translation methods Channel allocation for transmission

Vocoders Waveform coders Channel allocation for transmission All of the above

Vocoders Waveform coders


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Both a & b None of the above

1. Independent of the signal source 2. Less complexity 3. Suitable for noisy environments 1 and 2 are correct 1 and 3 are correct 2 and 3 are correct All the three are correct

Waveform coding Vocoders Block transform coding Sub-band coding


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Waveform coders Vocoders Sub band coding Block transform coding

Envelope detection, sampling, encoding, multiplexing Sampling, Envelope detection, encoding, multiplexing Envelope detection, encoding, sampling, multiplexing Sampling, Envelope detection, multiplexing, encoding

Samplers Linear lters Encoders Multiplexers


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High frequency bands of speech Low frequency bands of speech Multiplexed signals Modulated signals

1. Current signal sample is obtained from linear combination of past samples 2. Current signal sample is independent of past samples 3. These are time domain vocoders 4. They are among low bit rate vocoders 1, 3 and 4 are correct 2, 3 and 4 are correct 1 and 4 are correct All the four are correct

1. Multiple pulses per period 2. Minimization of weighted mean square error


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3. Better speech quality 4. Pitch detection is not required 1 and 4 are correct 1 and 3 are correct 2 and 4 are correct All four are correct

The residue of subtraction of generated and original signal is quantized at the transmitter Pitch detection is not required Multiple pulses per period Coder and decoders have predetermined set of codes

Pre emphasis, segmentation, windowing, ltering Windowing, Pre emphasis, segmentation, ltering Pre emphasis, windowing, segmentation, ltering https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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Pre emphasis, segmentation, ltering, windowing

Blackman window Welch window Cosine window Hamming window

STP lter LTP lter Quantizer PLL

Ia bits Ib bits II bits


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Both a and b Both a and c

1. Robustness to transmission errors 2. Cell size 3. Type of modulation technique used 4. Distance between the transmitter and receiver 1 and 4 are correct 1, 2 and 3 are correct 2 and 4 are correct All four are correct

Time Phase Spectrum Amplitude

The small unused bandwidth between the frequency channels to avoid interference https://electr oni cspost.com /m ul tipl e- choice- questi ons- and- answer s- on- mobi le- com muni cati on/

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The bandwidth allotted to the signal The channel spectrum The spectrum acquired by the noise between the signal

TDMA FDMA CDMA SDMA

1. Each user is assigned unique frequency slots 2. Demand assignment is possible 3. Fixed assignment is possible 4. It is vulnerable to timing problems 1 and 2 are correct 2 and 4 are correct 1, 2 and 3 are correct All four are correct


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1. Single channel per carrier 2. Multi channel per carrier 3. Single transmission in one time slot 4. Multi transmission in one time slot 1 and 2 are correct 2, 3 and 4 are correct 1, 2 and 3 are correct All four are correct

1, 2 and 3 are correct 1 and 2 are correct 1 and 4 are correct All four are correct


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Different users in different time slots Each user is assigned unique frequency slots Each user is assigned a unique code sequence Each signal is modulated with frequency modulation technique

True False

Use of same frequency channel for same time slot Use of same frequency channel for different time slot Use of same time slot for different frequency channel Use of different time slot for d ifferent frequency channels


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TDMA cellular systems FDMA cellular systems CDMA cellular systems SDMA cellular systems

1 and 2 are correct 1, 2 and 3 are correct 2 and 4 are correct All four are correct


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1, 2 and 3 are correct 2 and 3 are correct 1, 2 and 4 are correct All four are correct

CDMA TDMA SDMA FDMA

1, 2 and 3 are correct 2 and 3 are correct 1, 2 and 4 are correct All the four are correct


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1, 2 and 3 are correct 2, 3 and 4 are correct 1, 2 and 4 are correct All the four are correct

1, 2 and 3 are correct 2, 3 and 4 are correct 1, 2 and 4 are correct All the four are correct


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1 and 2 are correct 1, 2 and 4 are correct 2 and 4 are correct All the four are correct



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To eliminate the need of pulse shaping lter To eliminate ISI High symbol rate Both a and b Both b and c


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Multiple users on single channel Single user on multiple channels as per demand Multiple users on multiple channels at different time slots Multiple users with coding techniques

Induced delays Low spectral efciency Large spectrum required Both a and b Both b and c

Random access protocol Scheduled access protocol Hybrid a ccess protocol Demand access protocol


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Increase in delay Increase in probability of collision Increase in spectrum Both a and b Both a and c

Smart antenna technology Use of spatial locations of mobile units within the cell More battery consumption Both a and b are correct Both b and c are correct

Mobile station battery consumption is low Reduced spectral efciency Increased spectral efciency Both a and b are correct Both a and c are correct


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Focused signal transmitted into narrow transmission beams Smart antennas pointing towards mobile stations Use of different frequencies at same time slot Both a and b are correct Both a and c are correct

Directly proportional to Doppler spread Indirectly proportional to Doppler spread Directly proportional to square of Doppler spread Directly proportional to twice of Doppler spread

Fast fading Frequency non selective fading Flat fading Frequency selective fading


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Multipath delay spread small scale fading Doppler spread small scale fading Both a & b None of the above

Coherence Bandwidth of the channel is less than bandwidth of transmitted channel Coherence Bandwidth of the channel is more than bandwidth of transmitted channel Coherence Bandwidth of the channel is equal to bandwidth of transmitted channel None of the above

Fast fading Slow fading


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Frequency selective fading Frequency non selective fading

Excess delay rms delay spread Excess delay spread All of the above

Channel that passes all spectral components with equal gain The bandwidth of modulated signal Channel that passes all spectral components with linear phase Both a and c Both a and b


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1 and 2 are correct 1 and 3 are correct 2 and 3 are correct All the three are correct


Mobile radio channel may be modeled as linear lter Impulse response is time varying Both a & b None of the above


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Convolution of transmitted signal and impulse response Addition of transmitted signal and impulse response Subtraction of transmitted signal and impulse response All of the above None of the above

Impulse response in frequency domain Impulse response in phase domain Power delay of the channel All of the above


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