EC2401

WIRELESS COMMUNICATION

TECHNICAL QUIZ - I

What is the frequency of Bluetooth?

a) 2.9 GHz b) 2.7 GHz c) 2.4 GHz d) 2.5 GHz

2. What is/are the advantages of frequency reuse?

a) Efficient utilization of radio spectrum b) Increased capacity c) Minimized interference d) All of above

3. Which allows subscribers to operate in mobile phone service areas other than the service area where the service is subscribed?

a) Roamingb) Grade of servicec) bothd) neither of above

4. What is the term used to mention small division of a given geographical area in mobile telephony?

a) Shellb) Cellc) Cored) Kernel

5. What is the method used to reduce the cell size and reduce capacity?

a) Intelligent cell approach b) Microcell approach c) Top down approach d) Bottom up approach

6. What is assigned between the spectrum of two channels in FDMA?

a) Interference band b) Co-inter band c) Guard band d) Inference band

7. What are the components of a Transceiver?

a) Transmitter and receiver b) Cell and mobile unit c) Cell and MTSO d) Transmitter and cell

8. What does PSTN stand for?

a)Pakistan Service Telephone Networkb) Police Station Telephone Networkc) Public Switch Telephone Networkd) None of the above

9. What is the multiple access technique employed for 3rd generation of mobile systems?

a)CDMA b)TDMA c) FDMA d)WCDMA

10. WHAT DOES MTSO STANDS FOR ?

a)MOBILE TELEPHONE SWTCHING OFFICEb).MOBILE TELECOMUNICATION SYSTEM

ONLINEc) NONE OF THESE d)ALL ABOVE

11. What is the coverage range characteristic of Cordless Telephony?

a) Limitedb) Unlimitedc) Normald) None of these

12. What is the technique used by mobile unit to proceed from one cell to another during the course of a call ?

a) Pagingb) Roamingc) Handover d) None of these

13. What is the formula to calculate the number of hexagonal cells per cluster?

a) n= i^2+ij+j^2 b) n= i+ij+j c) n= i^2+j^2 d) n= i+ij-j^2

14. What is the second name for mobile station and base station uplink?

a)Downlink b)Forward Link c) Reverse Link d) None of the above

15. Which one is not a Duplexing Tecnique? a)Simplex b)Half Duplexc) Multiple Duplexd) Full Duplex

16. What does CAI stand for?

a)Control Air Interface b)Common Air Interfacec)Communication Air Interface d) All of the above

17. What is the name of the process of selecting and allocating channels groups for all base stations with a system?

a) frequency planningb) frequency planning and reusingc) frequency resuingd) non of these.

18. What is/are the method/methods of channel assignment in mobile communication?

a) fixed and dynamicb) fixedc) dynamicd) non of these

19. Which infrastructure covers location area in mobile communication?

a) BTS b) BSc) MSCd) operator

20. What does HLR stand for?

a)High light register.b) Hexagonal registerc)Home location registerd) High location register

21. What does FDD stand for?

a)Frequency duplex division b)Free division duplexc) Frequency division duplex d) Frequency dwell time

22. What does RSSI stand for?

a)Radio signal strength indicatorb)Radio strength signal induction c)Radio signal strength inductiond)Radio strength signal indicator

23. What is the characteristic of parabolic dish antenna?

A) omnidirectionalB) BidirectionalC) Unidirectional D) Horn

24. What is the comparison value of angle of incidence to the critical angle for the light beam to bend along the interface?

A) More thanB) Less thanC) Equal toD) None of the above

25. What occurs when a beam of light travels through media of two different densities, provided the angle of incidence is greater than the critical angle?

A) Scattering B) RefractionC) IncidenceD) Criticism

26. What is the propagation mechanism used in the inner core of fiber optic?

A) ReflectionB) RefractionC) Modulation D) None of the above

27. What does Doppler Spread depend on?

(a) the fade margin (b) the speed of the antenna (c) the delay spread (d) none of these

28. What GSM can best be called as?

(a) cordless telephony (b) cellular telephony (c) wireless communication (d) none of these

29. Which method monitors the medium after it sends a frame to see if the transmission was successful and if so, the station is finished otherwise if, however, there is a collision, the frame is sent again?

A) CSMA/CA B) CSMA/CD C) either (a) or (b) D) both (a) and (b)

30. Which method avoids collision three strategies: the inter frame space, the contention window, and acknowledgments?

A) CSMA/CA B) CSMA/CD C) either (a) or (b) D) both (a) and (b)

31. Which method shares the bandwidth of the channel in time?

A) FDMA B) TDMA C) CDMA D) none of the above

32. Which method transmits its data in its assigned time slot?

A) OFDM B) TDMA C) DQPSK D) none of the above

33.Which method is based on coding theory and uses sequences of numbers called chips?

A) FSK B) MSK C) CDMA D) none of the above

34. Which technique expands the bandwidth of a signal by replacing each data bit with n bits?

A) GPSK B) DSSS C) FHS D) TDM

35. Which technique uses M different carrier frequencies that are modulated by the source signal amd t one moment, the sign modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency?

A) FDM B) DSSS C) FHSS D) TDM

36. What is the name of the handoff where a mobile station only communicates with one base station?

A) hard B) soft C) medium D) none of the above

37.What is the name of the handoff where a mobile station can communicate with two base stations at the same time?

A) Strong B) soft C) Ultra D) none of the above

38. What is/are multiple access technique(s) used in GSM?

A) FDMA B) TDMA C) CDMA D) both (a) and (b)

39. What are the factors influencing small scale fading?

(a) Speed of surrounding objects(b) Multipath propagation(c) Transmission bandwidth of the signal.(d) all of these

40. What is/are the multiple access techniques?

(a) Frequency division multiple access(b) Time division multiple access (c) Code division multiple access(d) all of these

41. What is percentage of maximum throughput in pure ALOHA is ?

A) 12.2 B) 18.4 C) 36.8 D) none of the above

42. Which method requires that each station first listen to the medium before sending?

A) MA B) CSMA C) FDMA D) CDMA

43. Which method was invented to avoid collisions on wireless networks?

A) CSMA/CA B) CSMA/CD C) either (a) or (b) D) both (a) and (b)

44. Which multiplexing technique involves signals composed of light beams?

A) FDM B) TDM C) WDM D) none of the above

45. What does ISM stand for?

(a)Industrial, Scientific, Medical (b)Industrial, Scientific, Matrix (c) Inter, Scientific, Medical (d) None of these

46. What does MPC stand for?

(a) Medium Access Control (b) Introduce of the multipath reception (c) Multipath Components (d) none of these

47. What does WAP stand for?

(a)Wireless Application Protocol (b)Wire-line Application Protocol (c)Wireless access protocol (d)(d) none of these

48. What does WLL stand for?

(a) Wireless Local Loop (b) Wire-line Application Protocol(c) Wireless access protocol (d) none of these

49. What does DECT stand for?

(a)Digital Enhanced Cordless Telecommunications

(b)Wire-line Application Protocol(c) Wireless access protocol (d) none of these

50. How do you term the cell having the same number in the adjacent cluster using the same set of RF Channels?

a) adjacent cell b) Co channel cell c) Macro cell d) Selective Cell