Quiznetik

Mobile Communication | Set 2

1. GSM system includes……..frequency bands.

Correct : C. a and b

2. PSTN stands for……

Correct : C. Public Switched Telephone Network

3. ISDN stands for……

Correct : A. Integrated Services Digital Network

4. Uplink means communication link from

Correct : B. MS to BS

5. Downlink means communication link from

Correct : A. BS to MS

6. GMSC is

Correct : B. Gateway Mobile Service Switching Center

7. AMPS stands for

Correct : B. Advanced Mobile Phone System

8. AMPS is used in

Correct : A. 1G

9. GPRS technology was introduced in

Correct : A. 2G

10. GPRS stands for

Correct : D. General Packet Radio Service

11. Which functional block in GSM architecture,consists of the radio transmitters and receivers circuits and their associated antennas?

Correct : A. BTS

12. Which functional block in GSM architecture, allocates radio resourses to a mobile call and for handovers?

Correct : B. BSC

13. Which functional block in GSM architecture is responsible for necessary switching functions required for MSs located in an associated geographical area?

Correct : C. MSC

14. ………………provides MS information used by MSC and maintains a list of legitimate,fraudulent or faulty MSs.

Correct : B. EIR

15. ……….. Is the database that allows checking of the user with assigned SIM card.

Correct : A. AUC

16. ……recognizes that the MS is from another PLMN when roaming is allowed.

Correct : D. VLR

17. …….stores the subscrier information and part of mobile information from home PLMN.

Correct : C. HLR

18. IMEI stands for

Correct : B. International Mobile Equipment Identity

19. IMSI stands for....

Correct : C. International Mobile Subscriber Identity

20. The IMEI can be found by entering what on the handset keypad?

Correct : B. *#06#

21. In GSM-900 system, two subbands of ………..are assigned.

Correct : D. 25 MHz

22. In GSM-900 system, total number of radio carriers are……………

Correct : B. 124

23. In GSM-900 system, uplink frequency is ……………

Correct : A. 935MHz-960MHz

24. In GSM-900 system, downlink frequency is ……………

Correct : D. 890MHz-915MHz

25. In GSM-900 system, uplink and downlink carrier frequency differ by ……………

Correct : B. 45MHz

26. A single 2G GSM frame consists of……..time slots

Correct : B. 8

27. GSM Architecture consists of …..

Correct : D. All the above

28. GSM Architecture consists of ….. Interface

Correct : D. All the above

29. GSM Architecture consists of …..

Correct : D. All the above

30. DCS 1800 has the uplink frequency range

Correct : B. 1710MHz-1785MHz

31. DCS 1800 has the uplink frequency range

Correct : C. 1805MHz-1880MHz

32. DCS 1800 has the uplink and downlink frequency interval of …..

Correct : C. 95MHz

33. DCS 1800 has ……number of duplex channels

Correct : B. 374

34. ……..services are supported by the GSM

Correct : D. All the above

35. 2G GSM architecture follows ……. Reference Model

Correct : A. OSI Model

36. Which kind of switching technique indicates the transfer of coded values from input to output during the same interval of time?

Correct : A. Space Switching

37. Which form/s of grading design has/have the tendency to share every trunk between equal number of groups?

Correct : A. Homogeneous Grading

38. The-------------- is a circuit switched network, while the -------------- is a packet- switched network

Correct : A. telephone, ATM

39. When a switch capacity is full, calls coming into that switch are said to be____.

Correct : C. blocked

40. Example of circuit switching and S&F (Stored and Forward) switching is

Correct : A. Telephone and Post of Telegraph

41. In ------------- each packet is treated independently of all others

Correct : B. datagram switching

42. In message switching system, an incoming message gets ____ especially if the required route is busy.

Correct : B. Stored in a queue & retransmitted

43. Which type of switching network involves the establishment of a dedicated path between two stations?

Correct : C. Circuit Switching

44. In packet switching, what does the header of each short size of packet consist of?

Correct : D. All of the above

45. If a group of trunk is offered 1200 calls during the busy hour & 20 calls are lost along with the average call duration of about 7 min, then what would be the total duration of congestion period?

Correct : C. 57.6 sec

46. In two-stage network, which phenomenon/situation occurs due to impossible connectivity of given incoming trunk to selected outgoing trunk specifically because of link utilization for other connection between primary and secondary switches?

Correct : C. Blocking

47. By how many times does the time division exchange exhibit connection and disconnection with respect to every millisecond, due to its ability of using rearrangeable networks?

Correct : C. 8

48. Which signals are regarded as call-progress signals as they are sent back to inform the caller about the progress of the call?

Correct : B. Status Signals

49. Which among the following can be adopted as a dedicated path between the source and destination in circuit switching?

Correct : D. All of the above

50. Consider the statements given below. Which among them represents the operational step executed in datagram Packet Switched Network?

Correct : D. Transmission of short messages of one or two packet length

51. Rectangular crosspoint array is a

Correct : A. Space switching

52. A time division time switch can be controlled in

Correct : D. All of above

53. In a one-stage space division switch, if N = 200, the number of cross points is

Correct : C. 40,000

54. ESS stands for

Correct : A. Electronic Switching System

55. Circuit switching takes place at the layer of

Correct : B. physical

56. Trunks are the lines that run between

Correct : C. Switching stations

57. Availability of single processor system is given by

Correct : D. MTBF/(MTBF+MTTR)

58. Unavailability of single processor system is given by

Correct : B. MTTR/MTBF

59. Availability of Dual processor system is given by

Correct : D. (MTBF)2/(MTBF)2+2(MTTR)2

60. Unavailability of Dual processor system is given by

Correct : B. 2MTTR2/MTBF2

61. Who developed the fundamental of trunking theory?

Correct : C. Erlang

62. MTTR means

Correct : C. Mean Time To Repair.

63. Which form/s of grading design has/have the tendency to share every trunk between equal numbers of groups?

Correct : A. Homogeneous Grading

64. In a time multiplexed space switching system, one speech sample appears every

Correct : A. 125 micro sec

65. Time synchronization is necessary in

Correct : B. TDM

66. Three methods of switching are

Correct : B. circuit switching, packet switching, and message switching

67. If ‘n’ number of users are present in a network with point-to-point links, then how many links will be required in the network?

Correct : B. n (n – 1) / 2

68. Which among the following is/are adopted by cross bar systems with hard wired control subsystem?

Correct : C. Both a and b

69. What is the hardware, used to establish connection as an electrical path between inlet and outlet pair in switching system, known as?

Correct : C. Both a and b

70. In folded type of network, ____

Correct : B. output lines are folded back to input lines

71. For the two-group grading consisting of 14 trunks, availability = 5, Ak = 1.4E and the required grade of service of about 0.01, what would be its traffic capacity?

Correct : A. 4.98 E

72. Which kind of switching system does not comprise any subscriber, concentrator or expander?

Correct : D. Tandem

73. In Electronic Switching Centre (ESC), the transmission rate of X.25 protocol is ____9.6 Kbps.

Correct : C. Greater than

74. In a single stage network

Correct : B. There is redundancy

75. What are the Methods to move data through a network of links and switches

Correct : D. Both a and b

76. In _________ resources are allocated on demand.

Correct : A. Packet switching

77. The situation when both transmitter and receiver have to work in tandem is referred to as

Correct : C. Synchronous

78. Given that MTBF=2000Hrs and MTTR = 4Hrs. Calculate the unavailability for single processor systems for 10 years and 30 years.

Correct : A. For 10years: U=175.2Hrs and For 30 Years, U=525.6 Hrs.

79. Given that MTBF=2000Hrs and MTTR = 4Hrs. Calculate the unavailability for dual processor systems for 10 years and 30 years.

Correct : A. For 10years: U=40.04 min and For 30 Years, U=2.1 Hrs.

80. Dual processor operates in ____ modes

Correct : D. All of the above

81. Total number of crosspoints in the two stage concentrator network

Correct : A. C2=2/M1/2 N

82. Total number of crosspoints in the two stage Expander network

Correct : B. C2=2/N1/2 M

83. Total number of crosspoints in the three stage concentrator network

Correct : C. C3=2N/(M+N)1/2

84. Total number of crosspoints in the three stage expander network

Correct : D. C3=2M/(M+N)1/2

85. Number of inlets and outlets in the two stage concentrator network are given by the formula

Correct : A. m = n= M1/2

86. Number of inlets and outlets in the two stage Expander network are given by the formula

Correct : B. m = n= N1/2

87. Different forms of grading are

Correct : A. Skipped, Homogeneous, progressive