Communications Engineering Coaching Materials: Section 5 Module 17

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(Last Updated On: December 8, 2017)

Communications Coaching Materials: Section  5 Module 17

This is the Section 5 Module 17 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 17

1. ATM used for video, voice and distance learning application where time is important

Constant bit rate

2. ATM service used where no service guarantees are required (email and file transfer)

Unspecified bit rate

3. ATM used for applications that require data transfer and distributed file service

Available Bit rate

4. ATM used for applications having end systems that can recover from variable traffic rats and small cell losses

Real-time Variable Bit Rate

5. Transferred electron bulk occurs in

Gallium Arsenide

6. Tropospheric scatter


7. IRIDUIM satellite network has how many spot beams?


8. Booth for TV observers (sponsors and VIPs)

Fish bowl

9. Frames per second in the US TV system


10. Intercarrier frequency in US color TV system

4.5 MHz

11. Number of lines per field in the US TV system

262.5 MHz

12. Lines per second in US TV system

15 750

13. Channel width in US TV system

6 MHz

14. Sets the standard for the computer languages, electrical specifications, communication protocol, etc.


15. Threshold current of laser

50 mA

16. International standard for optical connector and all the test standards


17. What IEC laser classification is very dangerous that even reflections are hazardous and the direct beam can cause fires and skin injury?

Class 4

18. What IEC laser classification where visible lasers with output within the visible spectrum of 400 to 700 nm can be found?

Class 2

19. Normal operating current of lasers used in FO

70 mA

20. Frames shorter than 64 bytes, invalid for Ethernet network


21. VF channel passband

0 – 4000 Hz

22. Electronic equipment that connects the downlink to the receiving site

Final mile or last mile

23. Electronic equipment that connects point of origin to the uplink

First mile

24. Asynchronous transmission has low-speed transmission less than ____kbps.


25. Nominal value of the dial pulse break interval in millisecond in the US is


26. To separate channels in TDM

AND gate

27. Difference between sound carrier and color subcarrier frequency

0.92 MHz

28. PIN diode

Microwave switch

29. In ISDN, what H-channel is designed for a variety of user-information functions, including enhanced video, compressed high definition television and telecasting?


30. In ISDN, how many more times is the speed of the H-O channel compared to the B-channel rate?


31. Category of ISDN digital services supports transfer of information without the network knowing or manipulating the content of the information?

Bearer services

32. ISDN assigned to telemetry and packet switched data


33. What category of ISDN digital services act at layer 4 to 7 of the OSI model and accommodate more complex data transfer needs?


34. The ISDN B-channel, which carries the subscriber communication, operates at what synchronous data rate?

64 kbps

35. GG is a CATV hyperband channel. What is its frequency band

336 – 342 MHz

36. A unit of luminance and a measurement of reflected brightness, used in describe light output of projection TV screens

Foot Lambert

37. When an electromagnetic waves are reflected at an angle from a wall, their wavelength along the wall is _____ the actual direction of propagation.

Greater than

38. In loose tube fiber design, optic fiber is up to _____ longer than the tube.


39. Non-resonant antenna

Rhombic antenna

40. In negative transmission, what is the relative amplitude of the modulated picture carrier wave for maximum white?


41. In negative transmission, what is the relative amplitude of the modulated picture carrier wave for black in the picture?


42. In negative transmission, what is the relative amplitude of the modulated picture carrier wave for blacking level?


43. In negative transmission, what is the relative amplitude of the modulated picture carrier wave for the tip of sync?


44. The baud rate is equal to ______ the bandwidth in ideal channel.


45. In satellite communication, what is the most powerful and popular subset of linear block codes because encoding and decoding can be implemented by using simple shift registers?

Cyclic code

46. Firewire developed by Apple Computer

IEEE 1394

47. What international standard for structured cabling concentrates on system and methods?


48. In synchronous network, what is recognized international standard?


49. CATV midband channel


50. FCC zones govern the separation of broadcasting stations within each zone. In zone 1, the minimum co-channel separation is ______ miles for VHF channels and ________ miles for UHF.

170, 155

51. Important class of nonbinary BCH class code in which the symbols are blocks of bits

Reed-Solomon code

52. GIF compression is lossless, supports transparency but allows a max of _____ colors only


53. What type of transmitter has been replaced by the use of microphones in many modern telephones?


54. Switching system improves the _____ of the data transfer.


55. Gray scale is usually divided into ______ steps.



Electron Bombardment Induced Conductivity

57. Multitone ringing generator

Anti-tinkle Circuitry

Output amplifier

Tone generation

58. ISDN channel type is reserved conventional analog telephone communication


59. Circuit that conform to ITU-T recommendations G.703 and G.704 for a primary rate operating at 2.048 Mbps?


60. FDDI

100 Mbps

61. For low attenuation, the best transmission medium is _____ waveguide.


62. A 35mm frame of film that measures 36 x 24 mm has aspect ratio of ____.


63. CATV midband channel range

162 – 168 MHz

64. The wavelength of a wave in a waveguide is _______ in free space.

Lesser than

65. Key element for both ISDN access and Intelligent Network Access


66. What internet firewall uses the IP address and TCP port number to decide if a packet can pass through the routers?

Packet filter

67. What Internet Firewall uses a comparison-based where a packet technique under filtering is compared with the saved state of the previously forwarded packets?

Dynamic Firewall

68. Basic group B

60 – 108 MHz

69. Horizontal scan rate for NTSC system

15.734 KHz

70. Public-key encryption method used for email

Pretty Good Privacy (PGP)

71. Video Conferencing standard for PSTN


72. Multiband HF antenna

Log periodic antenna

73. Microwave link repeaters are typically ______ apart because of earth curvature

50 km

74. Latency in voice communication … delay over

100 ms

75. Horizontal scan rate for the NTSC system

63.556 ms

76. Protocols may be ______ oriented

Bit, character, byte

77. If the antenna diameter in a radar system is increased by a factor of 4 the maximum range will be increased by a factor of ____.


78. What laser specification is quoted only in a typical value?


79. In FO, ________-size cables have counts increasing in multiples of 6 or 8 to give sizes of 12, 18, 24, 30 and 36.


80. E4 bit rate

139.264 Mbps

81. Microprocessor require in order to work with a telephone circuit


82. The operating temperature of lasers in FO is typically from ______ to ______ degrees Celsius.

-5, 65

83. How many different tones may be produced by a 4-column keypad?


84. Filter used for SSB generation


85. Bit rate of frame alignment of E1 system

28 kbps

86. Symmetrical DSL was developed to provide high speed communications on a single cable pair, but at distances n greater than ________ feet.


87. Max deviation of FM sound signal


88. Pretty Good Privacy(Internet security) based on

Rivest-Shamir Adleman Algorithm

89. # of Unique tones for a 12-key dual-tone multi-frequency keypad


90. Typical response time of light detector in FO

3.5 ns

91. Antenna best excited by waveguide


92. Transport capacity of SONET virtual tributary frame (VT1.5)

1.728 Mbps

93. Percent power saving, if carrier of a 100% modulated AM is suppressed


94. What category of ISDN digital services adds an additional layer including reverse charge, call waiting, message handling and etc.

Supplementary Services

95. Transfer electron bulk modulus occurs in ______________.

Gallium Arsenide

96. In radar, the transmitter power is increased by a factor of 16, the maximum range will be increased by a factor of __________.


97. Iridium satellite network has _____ number of spot beams?


98. What are the functions provided by the multi-frequency ringer generator?

Output Amplifier, Tone Generator, Anti-Tinkle

99. The voice frequency channel passband?


100. Normal operating current of laser in fiber optics.


What matters most is that when you are really doing your part. =b

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