Communications Engineering Coaching Materials: Section 5 Module 18

This is the Section 5 Module 18 of the compiled Communications Coaching Materials taken from different sources including but not limited to Communications books, past Board Exams Questions, Journals and the Internet.

Communications Coaching Materials: Section  5 Module 18

This is the Section 5 Module 18 of the compiled Communications Coaching Materials taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.

Communications Engineering Coaching: Section 5 Module 18



1. The frame alignment format for DS-1 signal contains

1 bit

2. The line coding scheme used for DS-1 signal is


3. Circuit that prevents dial pulsing from ringing the bell


4. Which office class is the local central office


5. Which exchange is used to connect between central offices when a direct trunk is not available


6. What component in the telephone set has the primary function of compensating for the local loop length


7. What type of receiver is most commonly used in a conventional telephone handset


8. What component of the telephone set has the primary function of interfacing the handset to the local loop

Induction coil

9. Pulse Stuffing is used in TDM to __ the transmission rate between input channels


10. The nominal value of the dial pulse break interval in milliseconds in US is


11. How many unique tones are used in 12-key dual tone multifrequency keypad


12. A 35 mm frame of film that measures 36 x 24 mm has an aspect ratio of


13. The bit rate of TDMA is __kbps


14. L600 mastergroup baseband has a bandwidth of ___kHz


15. Minimum illumination recommended for reading is __lx


16. What is measured on a circuit where it is correctly terminated but does not have any traffic

White noise

17. Noise when measured across the tip and ring terminals of a network shall be ___dBrnCO


18. What is the highest frequency that can be generated by an IMPATT microwave diode oscillator


19. What is the least expensive connector that is widely used for CATV, VCRs and TV sets

F-7 type

20. What is the typical output voltage of magnetic microphone


21. What refers to the cost effective standard based wireless solution that specifically supports low data rates, low power consumption, security and reliability and is also known as IEEE 802.15.4?


22. In April 2002, the IEEE published their 802.16 standard for “broadband wireless access” (BWA), more commonly known as ___.


23. What is the gamma of the picture tube of the television?


24. What is the signal rate of RS 232 normally used as interface between DTE and DCE?


25. What fiber optic wavelength is used because of an attenuation null at the wavelength?

1.3 microns

26. What is the standard IF frequency for picture used in TV receivers following NTSC standard?

45.75 MHz

27. What is the average maximum data rate for fiber optics?

50 Gbps

28. What is the commonly used telephone wire?

AWG # 19

29. How many mixers are there in an SSB receiver


30. What is the heater voltage of TV receiver picture tube

6.3 V

31. How many oscillators does a black and white TV receiver contain?


32. Shadow mask for color TV has about ___ holes

300 000

33. What is the typical value of the velocity factor of an open wire transmission line?


34. Which among the IEEE standard refers to the global specification for wireless LAN?


35. What is the width of V blanking pulse?

1333 microseconds

36. What is the width of H blanking

10.2 microseconds

37. What is the GPRS uplinks data rate?

14 kbps

38. Using a single frequency sound wave to produce a 3D image of an object. It is usually viewed on a CRT

Acoustic Holography

39. The audio portion of a videotape has a bandwidth around

50Hz to 10 kHz

40. To avoid interference between adjacent satellites, geostationary satellites operating in C band must be separated by how many degrees?

2 degrees

41. The operating frequency range of low frequency CATV amplifier

1 Hz- 150 MHz

42. High frequency range of CATV amplifier

300 MHz- 50 000 MHz

43. What do you call the vertical edge distortion of screen image

Barrel effect

44. MPEG-2 data compression can reduce the amount of high-definition TV data by a ratio of

55 to 1

45. A satellite classified as BIG LEO, which is used for voice and data services, operates in what range of frequencies?

>10 GHz

46. Telstar 1 was considered as the world’s first active communications satellite. In what year was Telstar 1 launched


47. A telephone, often an 800 toll-free number, which spells something, such as 1-800-EXCELRC is called

Vanity line

48. IMT-2000 is the standard family for 3G mobile communications systems. If it is called UMTS in Europe, what is it called in Japan?


49. The encryption standard is a ____ -bit private key. (unclassified computer data)


50. Types of earth station

VSAT, short, long earth station

51. Long distance data transmission

21 to 4000 ft.

52. Medium distance data transmission

More or less 20 ft.

53. Cable modems are used in cable tv systems and provide data rates of typically between

3 and 50 Mbps

54. In fiber optics, VSR or very short reach is a physical layer specification that operates upto 10GHz over distances of less than __

300 m

55. The RS-232C has how many pins


56. Maximum speed on an RS-232 cable


57. Local Multipoint Distribution system (LMDS) is a system developed for wireless local loop application, supports voice and high speed interactive data, with the potential to provide bandwidth as much as ___


58. Most popular standard for communication and connection between DCE and DTE


59. Data rate of CSMA/CD


60. Bit rate of DS-1 signal over a T-1 line


61. LOS


62. Theoretical range of WIMAX


63. Practical range of WIMAX


64. IEEE 802.15


65. Wireless LAN

IEEE 802.11b

66. GPS was first used in what year


67. 3G bit rate for stationary


68. 3G bit rate for high speed vehicle


69. 3G bit rate for slow moving pedestrian


70. In fiber optics, LED can provide light output in ___ window

All of the above (850 nm, 1300nm, 1550nm)

71. It is the term used to describe a GSM and EDGE based 200kHz Radio access network


72. G3 facsimile equipment


73. Group 3 Fax machines


74. In PC, infrared port (Infrared serial data link), used to synchronize with other devices. It can provide up to ____


75. When the PLL is locked the phase detector is…

76. Voice channels in DS-2


77. Number of groups in supermastergroup (CCITT’s TDM hierarchy)


78. Ethernet bit rate for CDMA/CD


79. Teletext is ___ times faster than Telex


80. The Hertz antenna is predominantly using frequencies above


81. It is the accidental transmission of VHF radio waves beyond the horizon that is probably caused by the temperature inversion at the lower atmosphere

anomalous propagation

82. Degree of protection of camera enclosure

Index of protection

83. 14400bps and 12200bps modem used on four wire leased line


84. _____protocol in X.25 for routing and addressing function similar to IP

Packet Layer

85. The function of the payload pointer is to facilitate synchronous operation to minimize network delay and to aid_____

All of the above

86. In data networks what occurs when the network runs out of capacity to pass all data submitted


87. A process that condenses entire NTSC or PAL Video bandwidth into digital signals that can be recorded on tape

Adaptive range coding

88. In a single gun color CRT, What electron beam travels straight through the tube


89. Ratio of the picture quality to the RF bandwidth

Bandwidth efficiency

90. Satellite……

Linear…..block and convolution…

91. Frequency range of fiber optic cable


92. The gateway is a backbone network device that is operating in the ____

Network layer

93. Satellite position


94. …. LPTV operates in the frequency band __

All of the above

95. Frequency range for wifi


96. iDEN

All of the above

97. Integrated Digital Enhanced Network (iDEN) is a mobile telecommunications technology, developed by Motorola, which provides its users the benefits of

All of the above

98. End-user-to-network interterface(s) in ISDN

All of the above (Basic access, primary access, broadband access)

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