Here are 1000 Wireless and Mobile Communications MCQ (Chapterwise).
1. What is Mobile communication?
a) Allows to communicate from different locations without the use of physical medium
b) Allows to communicate from different locations with the use of physical medium
c) Allows to communicate from same locations without the use of physical medium
d) Allows to communicate from same locations with the use of physical medium
View Answer
Explanation: Mobile communication is use of technology that allows users to communicate from different locations without the use of physical medium (wires or cables).
2. What is wireless communication?
a) Sending data from one location to with the use of physical medium
b) Sending data from one location to another without the use of physical medium
c) Sending data from one location to another without the use of virtual medium
d) None of the mentioned
View Answer
Explanation: Wireless communication is a way of sending data from one location to another without the use of wires, cables, or any other physical medium.
3. Which of the following is a type of wireless communication?
a) LAN
b) WAN
c) PAN
d) All of the mentioned
View Answer
Explanation: The three different types of wireless networks:
i) WWAN – Wireless Wide Area Networks
ii) WLAN – Wireless Local Area Network
iii) WPAN – Wireless Personal Area Network
4. Which of the following is not an example of wireless communication?
a) Wi-Fi
b) Mobiles
c) Landline
d) Wireless Computer Parts
View Answer
Explanation: Examples of different types of wireless communication devices are mobiles, Zigbee wireless technology, Cordless telephones, GPS, satellite television, Wi-Fi, and wireless computer parts.
5. Why wireless communication is used?
a) It enables billions of people to connect to the Internet
b) Lowers the cost of network infrastructure
c) Makes services more inexpensive
d) All of the mentioned
View Answer
Explanation: Wireless communications have enabled billions of people to connect to the Internet, allowing them to profit from today’s digital economy. It also allows for economies of scale by lowering the cost of network infrastructure and user devices, making services more inexpensive.
6. _______ is a transmission method used in MIMO wireless communications to transmit encoded data signals independently.
a) MU-MIMO
b) STTD
c) SM
d) Collaborative Uplink MIMO
View Answer
Explanation: Spatial multiplexing is a transmission method used in MIMO wireless communications to transmit encoded data signals independently and separately (so-called streams) from each of the multiple transmit antennas.
7. Space diversity s also known as ________
a) Frequency diversity
b) Antenna diversity
c) Polarization diversity
d) Time diversity
View Answer
Explanation: Space diversity is also known as antenna diversity. It is one of the popular forms of diversity used in wireless communications. Signals received from the spatially separated antenna on the mobile would have essentially uncorrelated envelopes for antenna separation.
8. MIMO was initially developed in the year __________
a) 1970
b) 1990
c) 1960
d) 1985
View Answer
Explanation: Since the initial development in the year 1990, MIMO Wireless Communications have become integral part of the most forthcoming commercial and next generation wireless data communication systems.
9. MIMO is a smart antenna technology.
a) False
b) True
View Answer
Explanation: MIMO is one of several forms of smart antenna technology, the others being MISO (multiple input, single output) and SIMO (single input, multiple output). It is an antenna technology for wireless communications in which multiple antennas are used at both the source and the destination.
10. Which type of transmission technique is employed by paging system?
a) Multicasting
b) Unicasting
c) Hybrid
d) Simulcasting
View Answer
Explanation: Simulcast is a reliable technique used by paging system by transmitting the same paging signal from multiple paging transmitters at approximately equal times.
11. Which of the following is the drawback for cordless telephones?
a) Security
b) Wireless technology
c) Limited coverage area
d) Mobile
View Answer
Explanation: Cordless telephone systems are wireless, but they have a disadvantage of limited coverage area with cell size of approx. 300 m. Being digital, they have very less chance of eaves dropping.
12. Which two channels are responsible for initiating mobile calls?
a) FCC and RVC
b) FVC and FCC
c) FVC and RVC
d) FCC and RCC
View Answer
Explanation: FCC (Forward Control Channel) and RCC (Reverse Control Channel) are control channels responsible for initiating mobile calls.
13. Which of the following is a CDMA standard of second generation network?
a) ETACS
b) EDGE
c) IS-95
d) IS-136
View Answer
Explanation: Interim Standard 95 (IS-95) is the most popular CDMA standard of second generation networks. IS-136 is a TDMA standard of 2G. EDGE is a standard of 2.5G and ETACS is a 1G standard.
14. Which of the following is not a TDMA standard of 2.5G network?
a) GPRS
b) GSM
c) HSCSD
d) EDGE
View Answer
Explanation: GSM (Global System for Mobile) is a TDMA standard for 2G network. HSCSD (High Speed Circuit Switched Data), GPRS (General Packet Radio Service) and EDGE (Enhanced Data rates for GSM Evolution) are TDMA standards of 2.5G technology.
15. Which of the following leads to the 3G evolution of GSM, IS-136 and PDC systems?
a) GPRS
b) HSCSD
c) W-CDMA
d) EDGE
View Answer
Explanation: The 3G evolution for GSM, IS-136 and PDC systems leads to W-CDMA (Wideband CDMA). It is based on the network fundamentals of GSM, as well as merged versions of GSM and IS-136 through EDGE. GPRS, EDGE and HSCSD are 2.5G networks.
16. Which of the following has no backward compatibility with 3G Cdma2000?
a) IS-95B
b) IS-95A
c) IS-95
d) GPRS
View Answer
Explanation: 3G Cdma2000 is based on the original IS-95 and IS-95A CDMA standards, as well as the 2.5G IS-95B air interface. While upgrading, Cdma2000 maintains backward compatibility with existing IS-95, IS-95A and IS-95B equipments. Thus, Cdma2000 allow wireless carriers to introduce a family of new high data rate Internet access capabilities within existing systems.
17. Which of the following specifies a set of media access control (MAC) and physical layer specifications for implementing WLANs?
a) IEEE 802.11
b) IEEE 802.16
c) IEEE 802.15
d) IEEE 802.3
View Answer
Explanation: IEEE 802.11 is a set of media access control and physical layer specification for implementing WLAN computer communication. It was founded in 1987 to begin standardization of spread spectrum WLANs for use in the ISM bands.
18. Which modulation scheme is used by Bluetooth?
a) GFSK
b) DQPSK
c) BPSK
d) MSK
View Answer
Explanation: Bluetooth uses GFSK (Gaussian Frequency Shift Keying). When GFSK is used for Bluetooth modulation, the frequency of the carrier is shifted to carry the modulation. By doing this the Bluetooth modulation achieves a bandwidth of 1 MHz with stringent filter requirements to prevent interference on other channels.
19. Which of the following is a universally adopted shape of cell?
a) Hexagon
b) Square
c) Circle
d) Triangle
View Answer
Explanation: Hexagonal cell shape is a simplistic model of radio coverage for each base station. It has been universally adopted since the hexagon permits easy and manageable analysis of a cellular system.
20. Which of the following is associated with the handoff in first generation analog cellular systems?
a) Breathing cell
b) Locator receiver
c) MAHO
d) Cell dragging
View Answer
Explanation: Locator receiver is a spare receiver in each base station. It is used to scan and determine signal strengths of mobile users which are in neighbouring cells.
21. Which of the following problem occur due to adjacent channel interference?
a) Cross talk
b) Missed calls
c) Blocked calls
d) Near-far effect
View Answer
Explanation: One of the main problems with adjacent channel interference is the near-far effect. It occurs when a mobile close to a base station transmits on a channel close to one being used by a weak mobile.
22. Which of the following technology distributes the coverage of the cell and extends the cell boundary to hard-to-reach places?
a) Sectoring
b) Cell splitting
c) Micro cell zone concept
d) Scattering
View Answer
Explanation: Micro cell zone concept distributes the coverage of the cell and extends the cell boundary to hard-to reach places. It is the solution for the problem of increased number of handoffs when sectoring which results in an increase of load on switching.
23. Which of the following do not undergo free space propagation?
a) Wired telephone systems
b) Wireless line of sight radio links
c) Microwave line of sight radio links
d) Satellite communication system
View Answer
Explanation: EM signals when traveling through wireless channels experience fading effects due to various effects. But in some cases the transmission is with no obstruction and direct line of sight such as in satellite communication, microwave and wireless line of sight radio links.
24. What is the dimension of object as compared to wavelength of propagating wave when reflection occurs?
a) Small
b) Same
c) Very small
d) Large
View Answer
Explanation: Reflection occurs when a propagating electromagnetic wave impinges upon an object which has very large dimensions when compared to the wavelength of the propagation wave. Reflection occurs from the surface of the Earth and from buildings and walls.
25. Which of the following explains the concept of diffraction loss?
a) Archimedes’ Principle
b) Fresnel zone
c) Principle of Simultaneity
d) Pascal’s Principle
View Answer
Explanation: The concept of diffraction loss is a function of the path difference around an obstruction. It can be explained by Fresnel zones. Fresnel zones represent successive regions where secondary waves have a path length from Tx to Rx which are nλ/2 greater than total path length.
26. Which of the following is not a practical path loss estimation technique?
a) Determination of percentage of coverage area
b) Hata model
c) Log distance path loss model
d) Log normal shadowing
View Answer
Explanation: Log normal shadowing, log distance path loss model and determination of percentage of coverage area are practical pat loss estimation techniques. Hata model is only valid for exterior environment.
27. Which of the most widely used model for signal prediction in urban areas?
a) Okumura model
b) Attenuation factor model
c) Ericsson Multiple Breakpoint Model
d) Log distance path loss model
View Answer
Explanation: Okumura’s model is one of the most widely used models for signal prediction in urban areas. This model is applicable for frequencies in the range 150 MHz to 1920 MHz (Extrapolated upto 3000 MHz).
28. Which of the following is not an effect caused by multipath in radio channel?
a) Random frequency modulation
b) Time dispersion
c) Rapid changes in signal strength
d) Power of base station
View Answer
Explanation: Rapid changes in signal strength over a small travel distance are caused due to multipath. It causes random frequency modulation due to varying Doppler shifts on different multipath signals. Time dispersion is also caused by multipath propagation delays.
29. What is the main disadvantage of RF pulse system?
a) Simplicity
b) Interference and noise
c) Not real time
d) Complexity
View Answer
Explanation: The main problem with RF pulse system is that it is subject to interference and noise. This is due to wide passband filter required for multipath time resolution.
30. Which of the following is not a multipath channel parameter that can be determined from power delay profile?
a) RMS delay spread
b) Doppler spread
c) Mean excess delay
d) Excess delay spread
View Answer
Explanation: The mean excess delay, excess delay spread and rms delay spread are some multipath channel parameters. They can be determined from a power delay profile. Doppler spread is a measure of spectral broadening caused by time rate of change of mobile radio channel.
31. Which of the following is not a channel parameter?
a) Coherence time
b) Rms delay spread
c) Doppler spread
d) Bandwidth
View Answer
Explanation: Channel parameters are coherence bandwidth, rms delay spread and Doppler spread. Signal parameters are bandwidth and symbol period. Different types of fading occur depending on the relation between channel and signal parameters.
32. Which of the following is an important statistics of a Rayleigh fading useful for designing error control codes and diversity schemes?
a) Doppler frequency
b) Level crossing rate (LCR)
c) Power density
d) Mobile speed
View Answer
Explanation: The level crossing rate (LCR) and average fade duration of a Rayleigh fading signal are important statistics. They are useful for designing error control codes and diversity schemes to be used in mobile communication.
33. Which of the following is not a principle shape factor?
a) Azimuthal direction of maximum fading
b) Angle of arrival
c) Angular spread
d) Angular constriction
View Answer
Explanation: Three principle shape factors are angular spread, angular constriction, and azimuthal direction of maximum fading. They are exactly related to the average rate at which a received signal fades.
34. Which of the following is not a technique for FM demodulation?
a) Phase locked discriminator
b) Slope detection
c) Zero crossing detection
d) Product detector
View Answer
Explanation: Various techniques such as slope detection, zero crossing detection, phase locked discrimination and quadrature detection are used to demodulate FM. Product detector is used for demodulating AM signals.
35. Which of the following is the ratio of the throughput data rate per Hertz?
a) Spectral density
b) Bandwidth efficiency
c) Power density
d) Power efficiency
View Answer
Explanation: Bandwidth efficiency reflects how efficiently the allocated bandwidth is utilized. It is defined as the ratio of throughput data rate per Hertz in a given bandwidth. It describes the ability of a modulation scheme to accommodate data within a limited bandwidth.
36. Which of the following is not a linear modulation technique?
a) π/4 QPSK
b) OQPSK
c) BPSK
d) FSK
View Answer
Explanation: OQPSK, π/4 QPSK and BPSK are the most popular linear modulation techniques. They have very good spectral efficiency. However, FSK is an non-linear modulation technique.
37. Which of the following is not a property of MSK?
a) Self synchronizing capability
b) Variable envelope
c) Spectral efficiency
d) Good BER performance
View Answer
Explanation: MSK has a constant envelope. It is a spectrally efficient scheme. It possesses properties such as constant envelope, spectral efficiency, good BER performance and self-synchronizing capability.
38. What is the set of possible carrier frequencies in FH-SS?
a) Hop
b) Hopset
c) Symbols
d) Chips
View Answer
Explanation: The set of possible carrier frequencies in FH-SS is called hopset. Hopping occurs of a frequency band that includes a number of channels. Each channel is defined as a spectral region with central frequency in the hopset.
39. Which of the following is specified by a specific number of bit errors occurring in a given transmission?
a) Equally likely event
b) Exhaustive events
c) Bit error rate
d) Outage event
View Answer
Explanation: Outage event is specified by a specific number of bit errors occurring in a given transmission. Evaluating the probability of outage is one of the means to judge the effectiveness of the signalling scheme in a mobile radio channel.
40. Which of the following is not used to improve received signal quality over small scale times and distance?
a) Diversity
b) Channel coding
c) Equalization
d) Modulation
View Answer
Explanation: Equalization, diversity and channel coding are the three techniques which are used to improve received signal quality and link performance over small scale times and distance. But, the approach, cost, complexity and effectiveness varies in wireless communication system.
41. Which of the following is not an advantage of lattice equalizer?
a) Faster convergence
b) Dynamic assignment
c) Numerical stability
d) Simple structure
View Answer
Explanation: The structure of lattice equalizer is more complicated than a linear transversal equalizer. But, numerical stability and faster convergence are two advantage of laatic equalizer. Also, its unique structure allows dynamic assignment of the most effective length of lattice equalizer.
42. Which of the following is not a category of space diversity technique?
a) Time diversity
b) Equal gain diversity
c) Selection diversity
d) Feedback diversity
View Answer
Explanation: Space diversity reception methods can be classified into four categories. They are selection diversity, feedback diversity, maximal ratio combining and equal gain diversity.
43. Which of the following is not a property of block code?
a) Cyclic
b) Non linearity
c) Linearity
d) Systematic
View Answer
Explanation: Block codes are linear, systematic and cyclic in nature. Encoding and decoding techniques make use of mathematical constructs known as finite fields.
44. Which of the following indicates the number of input bits that the current output is dependent upon?
a) Code length
b) Search window
c) Information rate
d) Constraint length
View Answer
Explanation: Constraint length determines the number of input data bits that the current output is dependent upon. The constraint length determines how powerful and complex the code is.
45. Which of the following is one of the most frequently used transform in speech coding?
a) Shearlet transform
b) Fourier transform
c) Discrete cosine transform
d) Wavelet transform
View Answer
Explanation: DCT (discrete cosine transform) is one of the most attractive and frequently used transforms for speech coding. Fast algorithms developed for computing the DCT in a computationally efficient manner are used.
46. Which of the following is an important factor in determining spectral efficiency of the system?
a) Vocoder
b) Modulation technique
c) Cell size
d) Multiple access technique
View Answer
Explanation: The type of multiple access technique used is an important factor in determining the spectral efficiency of the system. It strongly influences the choice of speech codec.
47. Which of the following measures spectrum efficiency of a wireless system?
a) Spectral capacity
b) Channel capacity
c) Carrier capacity
d) Radio capacity
View Answer
Explanation: Radio capacity is a parameter which measures spectrum efficiency of a wireless system. This parameter is determined by the required carrier to interference ratio and the channel bandwidth.
48. Which of the following standard had not adopted digital TDMA for high capacity?
a) PDC
b) USDC
c) IS-95
d) GSM
View Answer
Explanation: Various proposed standards such as the GSM, US digital cellular (USDC), and Pacific Digital Cellular (PDC) have adopted digital TDMA for high capacity. IS-95 does not use TDMA.
49. Which of the following is true for first-generation wireless systems?
a) Low rate
b) Efficient
c) High data rate
d) Digital technology
View Answer
Explanation: First generation wireless systems provide analog speech and inefficient, low rate, data transmission between the base station and mobile user.
50. Which of the following is not a service offered by SS7?
a) Alternate billing services
b) Touchstar
c) 400 services
d) 800 services
View Answer
Explanation: There are three main types of services offered by the SS7 network. They are the Touchstar, 800 services, and alternate billing services.
Chapterwise Multiple Choice Questions on Wireless and Mobile Communications
- Introduction to Wireless Communication Systems
- Modern Wireless Communication Systems
- The Cellular Concept – System Design Fundamentals
- Mobile Radio Propagation: Large – Scale Path Loss
- Mobile Radio Propagation: Small – Scale Fading and Multipath
- Modulation Techniques for Mobile Radio
- Equalization, Diversity and Channel Coding
- Speech Coding
- Multiple Access Techniques for Wireless Communications
- Wireless Networking
- Wireless Systems and Standards
- Network Protocol
- Satellite Systems & Recent Advances
- 4G
- Wireless LAN
1. Multiple Choice Questions on Introduction to Wireless Communication Systems
The section contains multiple choice questions and answers on paging system, cordless and cellular telephone systems.
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2. MCQ on Modern Wireless Communication Systems
The section contains questions and answers on second and third generation cellular networks, 2.5g, 3g w-cdma, 3g cdma2000, wireless local area networks, bluetooth and personal area networks.
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3. Wireless & Mobile Communications MCQ on The Cellular Concept – System Design Fundamentals
The section contains MCQs on frequency reuse, channel assignment and handoff strategies, interference and system capacity, service grading and trunking, improving coverage and capacity in cellular systems.
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4. Mobile Communications Multiple Choice Questions on Mobile Radio Propagation: Large – Scale Path Loss
The section contains multiple choice questions and answers on free space propagation model, reflection, diffraction, scattering, practical link budget design using path loss models, outdoor and indoor propagation models.
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5. Mobile Communications MCQ on Mobile Radio Propagation: Small – Scale Fading and Multipath
The section contains questions and answers on small scale multipath propagation and measurements, impulse response model, mobile multipath channels parameters, small scale fading types, multipath fading channels, multipath shape facors, rayleigh and ricean distribution.
6. Mobile Communications Multiple Choice Questions on Modulation Techniques for Mobile Radio
The section contains MCQs on frequency modulation, amplitude modulation, angle modulation, digital modulation, pulse shaping techniques, linear modulation and spread spectrum modulation techniques, constant envelope modulation and its techniques, fading modulation performance and multipath channels.
7. Wireless & Mobile Communications MCQ on Equalization, Diversity and Channel Coding
The section contains multiple choice questions and answers on equalization fundamentals and techniques, adaptive equalization algorithms, diversity techniques, rake receiver, convolutional codes, block codes and finite fields.
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8. Wireless & Mobile Communications Multiple Choice Questions on Speech Coding
The section contains questions and answers on speech signals characteristics, quantization techniques, frequency domain coding of speech, vocoders, linear predictive coders and speech codecs.
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9. Multiple Choice Questions on Multiple Access Techniques for Wireless Communications
The section contains MCQs on multiple access basics, frequency division multiple access, time division multiple access, spread spectrum multiple access, packet radio and cellular systems capacity.
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10. MCQ on Wireless Networking
The section contains multiple choice questions and answers on wireless and fixed telephone networks, wireless networks development and traffic routing, wireless data services, integrated services digital network, signalling system no. 7 and personal communication services.
11. Multiple Choice Questions on Wireless Systems and Standards
The section contains questions and answers on amps, etacs, united states digital cellular, global system for mobile, gsm channel types, cdma digital cellular standard and digital european cordless telephone.
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12. Wireless & Mobile Communications MCQ on Network Protocol
The section contains MCQs on network protocols, tcp/ip protocol, tcp over wireless and internet protocol version 6.
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13. Wireless & Mobile Communications Multiple Choice Questions on Satellite Systems & Recent Advances
The section contains multiple choice questions and answers on satellite systems, femtocell network, ultra-wideband technologies and multicast in wireless networks.
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14. Wireless & Mobile Communications MCQ on 4G
The section contains questions and answers on long term evolution, 4g network architecture, orthogonal frequency division multiple access and multiple input multiple output.
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15. Wireless & Mobile Communications MCQ on Wireless LAN
The section contains MCQs on broadband radio access network, wlan physical layer, MAC management and 802.11 enhancements.
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Wish you the best in your endeavor to learn and master Wireless & Mobile Communications!
