# 180+ Mobile Communication Solved MCQs

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1.

## Which model of loss system allows the usage of Poisson distribution model for traffic analysis especially by assuming infinite number of users?

A. lost calls cleared (lcc)
B.  lost calls returned (lcr)
C.  lost calls held (lch)
D. none of the above
Answer» A. lost calls cleared (lcc)
2.

## Which type of holding time distribution is assumed for the voice conversation on telephone?

A. constant
B. exponential
C. both a and b
D. none of the above
3.

A. commutative
B. distributive
C. cumulative
D.  deductive
4.

## In analyzing the traffic performance, how is the number of trunk decided with the provision of the Grade of Service (GoS) especially for larger group?

D. none of the above
5.

## By which name/s is the Grade of Service (GOS) well-known?

A. call congestion
B. time congestion
C. both a and b
D. none of the above
6.

## How is the relation between Erlang and CCS specified?

A. 1 erlang = 36 ccs
B. 1 erlang = 56 ccs
C. 1 erlang = 76 ccs
D. 1 erlang = 96 ccs
Answer» A. 1 erlang = 36 ccs
7.

## The ratio of number of successful calls to the number of call attempts is known as ______

A. call completion rate (ccr)
B. call block rate (cbr)
C. busy hour call rate (bhcr)
D. none of the above
Answer» A. call completion rate (ccr)
8.

## Which assumption prooves call arrivals has Poisson's distribution?

A. pure chance traffic
B. statistical equilibrium
C. full availability
D. calls which faces congestion and gets lost
9.

## The process in which control signal shares the same path as voice and data is called as __________

A. pcm signalling
B. inband signalling
C. outband signalling
D. all of the above
10.

A. volume
B. speed
C. distance
D.  time
11.

## Erlang -B and Erlang-C formulae became foundational results in _________

A. teletraffic engineering
B. queueing theory
C. both 1 and 2
D. none of the above
Answer» C. both 1 and 2
12.

## A message of one signal unit length is called as _________

A. single unit message
B. multi unit message
C. double unit message
D. all of the above
13.

## ________ group of trunk's system is more efficient.

A. small
B. medium
C. large
D. none of the above
14.

## The system in which call requests are kept waiting due to unavailability of trunks is known as ____________

A. lost calls system
B. queueing system
C. lost systems in tandem
D. none of the above
15.

A. 21.6 sec
B.  42.2 sec
C.  57.6 sec
D. 98.2 sec
16.

## Customer line signalling is used for __________

A. generation of supervision signals and digits
B. conversion of received electrical tone and announcement signals into sound signals
C. conversion of electrical ringing signal into a high level acoustic signal
D. all of the above
Answer» D. all of the above
17.

## CCS signalling network is based on __________

A. geographical location of signalling points
B. number and size of signalling points
C. offered load and services to be provided
D. all of the above
Answer» D. all of the above
18.

A. 0.025
B. 0.005
C. 0.076
D. 0.056
19.

A. 0.037
B. 0.275
C. 0.0917
D. 0.963
20.

A. 60e
B. 0.3e
C. 59.7e
D. 55.9e
21.

## A group of 20 servers carry a traffic of 10 Erlangs. If average duration of calls is 3 minutes, calculate the no. of calls put through by a single server and a group as a whole in 1 hour period.

A. 10 calls by single server and 200 calls by a group
B. 8 calls by single server and 250 calls by a group
C. 100 calls by single server and 200 calls by a group
D. none of the above
Answer» A. 10 calls by single server and 200 calls by a group
22.

## Over 20 minutes observation interval, 40 subscribers initiate a call. Total duration of calls is 4800sec. Calculate load offered to network by the subscribers and average subscriber traffic?

A. 2e and 0.5e respectively
B. 3e and 1.5e respectively
C. 4e and 0.1e respectively
D. 1e and 0.2e respectively
Answer» C. 4e and 0.1e respectively
23.

## Formats of signal units in CCTTT no. 7 signalling system are ________________

A. message signalling unit
C. fill-in unit
D. all of the above
Answer» D. all of the above
24.

## Features of CCITT no. 7 signalling system (SS7) are ________________

A. used in services like telephony, data,images and video.
B. suitable for terrestrial as well as satellite links.
C. internationally accepted standard
D. all of the above
Answer» D. all of the above
25.

A. 2
B. 3
C. 4.5
D. 5
26.

## Major classes of signalling are ___________

A. customer line signalling
B. in channel signalling
C. common channel signalling
D. both 2 and 3
Answer» D. both 2 and 3
27.

A. 0.123
B. 0.135
C. 0.595
D. 0.455
28.

## Standards of CCITT Signalling system are _____

A. ss6
B. ss5
C. ss7
D. both 1 and 3
Answer» D. both 1 and 3
29.

## Inter register signalling can be done by _________

B. end to end basis
C. line signalling
D. all of the above
Answer» D. all of the above
30.

## In Erlang's analysis of efficient telephone line usage he derived the formulae for two important cases, ________,

A. erlang-b
B. erlang-c
C. erlang-a
D. both 1 and 2
Answer» D. both 1 and 2
31.

## What are the types of inter register signalling?

A. en-bloc signalling
B. overlap signalling
C. both 1 and 2
D. none of the above
Answer» C. both 1 and 2
32.

## Erlang determined GoS of lost call system of finite number of trunks based on assumptions: 1. Pure chance traffic 2. Statistical equilibrium 3. Full availability 4. calls which face congestion and get lost

A. 1 and 2
B. 2 and 3
C. 3 and 4
D. all of the above
Answer» D. all of the above
33.

## Traffic tables show relationships of ____________

A. offered traffic \a\
B. blocking probability (gos)
C. number of trunks \n\
D. all of the above
Answer» D. all of the above
34.

## A group of 10 servers carry a traffic of 5E. If the average duration of calls is 1.5 minutes, calculate the number of calls put through by a single server and a group as a whole in 1 hr period.

A. 20 calls and 200 calls
B. 10 calls and 200 calls
C. 5 calls and 100 calls
D. none of the above
Answer» A. 20 calls and 200 calls
35.

## A group of 5 trunks carry a traffic of 2E. Find 1. GoS 2. Probability that only one trunk is busy.

A. 0.037 and 0.275
B. 0.027 and 0.325
C. 0.047 and 0.475
D. none of the above
36.

## Over 10 minutes observation interval, 20 subscribers initiate a call. Total duration of calls is 2400sec. Calculate load offered to network by the subscribers and average subscriber traffic?

A. 4e and 0.1e respectively
B. 2e and 0.5e respectively
C. 3e and 1.5e respectively
D. 1e and 0.2e respectively
Answer» A. 4e and 0.1e respectively
37.

## Which among the following represents the flawless hand-off with no perceivable interruption of service?

A. Hard hand-off
B. Soft hand-off
C.  Intracell hand-off
D. Intercell hand-off
38.

A. United
B. Divided
C.  Restricted
D. Filtered
39.

## Which method of cellular network assists in minimizing the co-channel interference associated with the angle of degree?

A. Cell Splitting
B. Cell Sectoring
C. Cell Segmentation & Dualization
D. None of the above
40.

## Which effect is widespread in adjacent-channel interference especially after the reception of a weak signal by a mobile user from the base-station?

A. Near-far effect
B. Doppler\s effect
C. Capture effect
D. Kendall effect
41.

## Which antennas are used at the center of the cells for the system with hexagonal-shaped cells?

A. Omni-directional antennas
B. Sectored directional antennas
C. Both a and b
D.  None of the above
42.

## The most comman dial up service used by a person making home telephone call is_____________

A. Analog Switched Service
B. Analog Leased Service
C. Switched/56 Service
D. Digital Data Service
43.

A. Synchronized
B. Modulated
C. Sampled
D. Filterd
44.

## The propagation model that estimates radio coverage of a transmitter is called ___________

A. Large scale propagation model
B. Small scale propagation model
D. Okumura model
Answer» A. Large scale propagation model
45.

A. Reflection
B. Diffraction
C. Scattering
D. Sectoring
46.

## Small scale propagation model is also known as _______

B. Micro scale propagation model
C. Okumura model
D. Hata model
47.

## Which of the following techniques do not help in expanding the capacity of cellular system?

A. Sectoring
B. Scattering
C. Splitting
D. Microcell zone concept
48.

## Which of the following technology distributes the coverage of the cell and extends the cell boundary to hard-to-reach places?

A. Cell splitting
B. Scattering
C. Sectoring
D. Micro cell zone concept
Answer» D. Micro cell zone concept
49.

## Cell splitting increases the capacity of a cellular system since it increases the number of times ________ are reused.

A. Cells
B. Channels
C. Transmitters
D. Mobile stations
50.

## Small scale variations of a mobile radio signal are directly related to _______

A. Impulse response of mobile radio channel
B. Impulse response of base station
C. Frequency response of antenna
D. Frequency response of base station
51.

## Discretization of multipath delay axis of impulse response into equal time delay segments is called __________

A. Excess delay bins
B. Delay bins
C. Discrete bins
D. Digital bins
52.

## In cellular telephone network, which component controls the switching between public wireline telephone network and the base station of cells for supporting the different calls between landline to mobile, mobile to landline and mobile to mobile calls?

A. Electronic Switching Center (ESC)
B. A Cell Controller
D. A common communication protocol
Answer» A. Electronic Switching Center (ESC)
53.

## In a cellular telephone system, which type of interference results from imperfect design of filters in receivers by allowing nearby frequencies to enter the receiver?

A. Co-channel Interference
C. Both a and b
D. None of the above
54.

## If the system is designed with the usage of hexagonal-shaped cells, how are the base-stations located?

A. At the centre of cell
B. At the edge of cell
C. At the corner of the cell
D. All of the above
Answer» D. All of the above
55.

A. Fast Busy
B. Slow Busy
C. Short Busy
D. Long Busy
56.

A. G=(4πAe)/λ2
B. G=(4π λ2)/ Ae
C. G=4πAe
D. G=Ae/λ2
57.

## Which of the following is not an advantage of micro cell zone technique?

A. Reduced co channel interference
B. Improved signal quality
C. Increase in capacity
D. Increasing number of base stations
Answer» D. Increasing number of base stations
58.

## Which of the following is not a channel parameter?

A. Bandwidth
B. Coherence time
59.

## Flat fading channel is also known as _____

A. Amplitude varying channel
B. Wideband channel
C. Phase varying channel
D. Frequency varying channel
60.

## For fast fading channel, the coherence time of the channel is smaller than _______ of transmitted signal.

B. Bandwidth
C. Symbol period
D. Coherence bandwidth
61.

## The time dispersive properties of wideband multipath channel are quantified by ______ and _______

A. Mean excess delay, rms delay spread
D. Mean excess delay, Doppler spread
62.

A. True
B. false
C. Both A and B
D. Cant Say
63.

## Why is the phase of individual multipath components are not received in RF Pulse system?

A. Due to use of duplexer
B. Due to use of ADC
C. Due to use of flip flops
D. Due to use of envelope detector
Answer» D. Due to use of envelope detector
64.

## Anyone who uses atelephone or data modem on the telephone circuit is a part of globle communication network called as__________________ and the pair of wires connecting a subscriber to the closest telephone office is called as ____________________.

A. Personal Mobile Telephone Network,Twisted Pair
B. World Wide Web, Subscriber Line
C. Internet, Drop Line
D. Public Telephone Network, Local Loop
Answer» D. Public Telephone Network, Local Loop
65.

## Free space propagation model is to predict ______,Which of the following do not undergo free space propagation?

A. Received signal strength,Wired telephone systems
B. Transmitted power, Satellite communication system
66.

## The free space model predicts that received signal decays as a function of _____

A. Gain of transmitter antenna
B. T-R separation
C. Power of transmitter antenna
D. Effective aperture of the antenna
67.

## Which hand-off stage deals with the relinquishment of unnecessary frequency channels by keeping the availability for other mobile users?

A.  Initialization
B. Resource Reservation
C. Call Execution
D. Call Completion
68.

## Free space propagation model is to predict ______ and Propagation model that characterize rapid fluctuation is called ________

A. Transmitted power,Hata model
C. Gain of transmitter, Large scale propagation model
69.

## Differentiate GSM and DECT.

A. Both B and C
B. GSM -Range is up to 70km. DECT-Range is limited to about 300m.
C. GSM- Global systems for mobile communications DECT- Digital enhanced cordless elecommunications
D. None of the above
Answer» A. Both B and C
70.

B. Multipath delay spread, Non linear phase response
C. Time dispersive parameters, Linear phase response
D. Frequency delay spread,Bandwidth is greater than the bandwidth of transmitted signal
71.

A. Microseconds
B. Nanoseconds
C. Seconds
D. Minutes
72.

## Power delay profile and magnitude frequency response of a mobile radio channel are related through _______

A. Laplace Transform
B. Fourier Transform
C. S Transform
D. Wavelet Transform
73.

## _____ and coherence bandwidth are inversely proportional to one another.Coherence bandwidth is a statistical measure of range of frequencies over which channel is considered _______

B. Mean excess delay,Frequency selective
74.

## Verify True or False A.Frequency domain channel sounding technique do not require hard wired synchronization between transmitter and receiver. B.There is no relationship between time domain and frequency domain techniques.

A. Both Statements True
B. Both Statements False
C. Only A true
D. Only B true
75.

## Which of the following is not an advantage of spread spectrum channel sounding system?

A. Real time
B. Rejection of passband noise
C. Coverage range improvement
D. Less transmitter power required
76.

## Verify True or False A. Impulse response is a narrowband characterization. B.Impulse response does not play any role in characterization of the channel.

A. Both Statements True
B. Both Statements False
C. Only A true
D. Only B true
77.

A. GSM
B. AMPS
C. CDMA
D. IS-54
78.

A. ITU
B. AT & T
C. ETSI
D. USDC
79.

A. Register
B. Flip flop
C. SIM
D. SMS
80.

A. BSS
B. NSS
C. OSS
D. Channel
81.

A. BSS
B. NSS
C. OSS
D. BSC
82.

A. BSS
B. NSS
C. OSS
D. MSC
83.

A. BSS
B. NSS
C. OSS
D. MSC
84.

A. GMSK
B. BPSK
C. QPSK
D. GFSK
85.

A. GSM
B. IS-136
C. AMPS
D. PDC
86.

## Which is one of the disadvantages of 2G standards?

A. Short Messaging Service (SMS)
B. Digital modulation
C. Limited capacity
D. Limited Internet Browsing
87.

A. 1.25 MHz
B. 200 KHz
C. 30 KHz
D. 300 KHz
88.

## GSM is an example of

A. TDMA cellular systems
B. FDMA cellular systems
C. CDMA cellular systems
D. SDMA cellular systems
89.

## GSM stands for...

A. Group Spécial Mobile
B. Global System for Mobile Communications
C. Great Streaming of Media
D. Global Standard of Mobile Communications
Answer» B. Global System for Mobile Communications
90.

A. Um
B. Abis
C. A
D. HLR
91.

## What is the basic service unit of GSM communications?

A. Location Area
B. Cell
C. OLMN Service Area
D. MSC / VLR Service Area
92.

## The first cellular systems were....

A. Analogue
B. Digital
C. Carrier waves
D. Modulating waves
93.

## The Base Station Subsystem (BSS) comprises of what?

A. The Base System Transcontroller and Base Station Condenser
B. The Base Transceiver Station and Base Station Controller
C. The Base Transcript System and Base System Computer
D. The Transfer Station and Base Station Computer
Answer» B. The Base Transceiver Station and Base Station Controller
94.

A. Hertz
B. Tx / Rx
C. Abis
D. Cbit
95.

## A duplex transmission is realized in 2G GSM with the help of ……..

A. FDD
B. TDD
C. a and b
D. None of the above
96.

## FDD stands for ……..

A. Frequency Division Duplex
B. Full Division Duplex
C. Frequency Double Duplex
D. Frequency Duplex Division
97.

## What is the interface between the BSS and MSC?

A. Um
B. Abis
C. A
D. None of the above
98.

## SIM stands for....

A. Serial Identity Master
B. Subscriber Interface Marker
C. Subscriber Identity Module
D. System Interface Module
99.

## 2G standards support

A. Limited internet browsing
B. Short Messaging Service
C. Both a & b
D. None of the above
Answer» C. Both a & b
100.

## GSM system is a …………..system.

A. Frequency division
B. Time Division
C. CDMA
D. a and b