This is the Section 1 Module 1 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 1 Module 1
1. GPRS – does not need packets
2. 9476 mi – average height of GPS
3. GPRS uplink – 14 kHz or 14 kbps
4. preamble – for synching Ethernet
5. 15 to 60 – gain of rhombic antenna
6. ½ to 2/3 – effective height of antenna compared to actual antenna height
7. Erlang B – traffic model used
8. Poisson’s equation - It is used, for instance, to describe the potential energy field caused by a given charge or mass density distribution.
9. Class III Catv channel – auxiliary equipment required
10. turnstile antenna – 2 dipoles 90 degrees apart
11. REM = RBE x RAD
12. 1 RBE = 10 for alpha particles and fast neutrons
13. reb – roentgen effective bio
14. rep - roentgen effective physical
15. rem – roentgen effective man
16. GPRS – 172.2 kbps
17. Auditorium reverberation time – 1.6 to 1.8 s
18. Neodymium Laser – 1.3µs or 1.3µm light
19. plastic fiber cables – red LED used
20. A and B weighting curve – response of human ear
21. Max Bluetooth range – 10m
22. MPEG 7 – Multimedia content Description Interface
23. Beverage antenna – “wave antenna”; 2 lambda
24. 4 degrees separation = 1833 miles
25. P 300 – maintenance cost for CATV
26. 52 degrees C – damage a crystal microphone
27. IMT 2000 – 1920 to 1980 MHz
28. Low Z microphones – dynamic, carbon, ribbon
29. High Z microphones – crystal, condenser, electret
30. TWT – interaction between e beam and RF field; linear path
31. Tunnel Diode – low power microwave oscillator
32. klystron and magnetrons – high power oscillators
33. secondary payload – smaller satellite
34. BNC – (Bayonet Neill–Concelman) connector for oscillators and lab instruments
35. Bell Labs – first cellular phone in 1924
36. Doghouse – temperature controlled enclosure for equipment
37. Erbium-doped fiber – 1.53µm to 1.63µm light
38. Celotex – high absorption of sound
39. Ethernet – bus topology most common
40. Network admin – gives passwords to LAN
41. Foster-Seeley discriminator – requires limiters
42. Ratio detector – does not require limiter
43. 50Ω - typical impedance of waveguide
44. RG62 – 93Ω
45. AWG 22 - Telephones – 120 Ω/loop mile
46. pink noise – flicker noise
47. discordant interval – unpleasant intervals of sound
48. 40% - microwave maximum obstructions
49. autodyne – LO + mixer in one
50. 1 mel = 1 Hz at 40dB
51. via net loss – to reduce singing or echo
52. root note – 1st note in musical scale
53. C – root note of diatonic scale
54. 1st octave of human hearing – 20 to 40 Hz
55. telephone channel – 4 octaves
56. Xmodem – used check sum
57. microwave transmission lines:
a. stripline = coax
b. microstrip = parallel wire
58. power of CB radio – 4W
59. X.25 – packet switching
60. ATM – 1 byte = 1 octet
61. ATM – virtual circuit identifier
62. Videocom – vacuum tube picture tube
63. sound carrier cable – 41.25 MHz
64. video carrier cable – 45.75 MHz
65. MIN + ESN (electronic serial number) – for billing tracking
66. phone – number assignment mobile (NAM) – for assignment of phone number
67. Local no. Portability – returning same features when switching carriers
68. GPRS – GMSK
69. EDGE – PSK
70. Lambertian effect/scattering – part of incoming light is absorbed part is radiated
71. Intensity Modulator – analog mod used for fiber optics
72. FDDI – fiber distribution data interface
73. LMDS – local multipoint distribution service; 28 GHz; internet, for home
74. MMDS – multichannel multipoint distribution service; many people; wireless cable; 2.5 – 2.686 GHz
75. Hotline – no need for dial tone
76. dial tone delay – interval between off hook and dial tone
77. comb filter – separates Y and chroma
78. North and South poles – hard to service by geosynch satellites because of low elevation angle
79. FCC – phase out analog TV by 2006 in US
80. 19.2 kbps – Cellular Digital Packet Data (CDPD); packets over voice channel
81. AMPS – supervisory audio tone
82. D-AMPS – CDVCC (Coded Digital Verification Color Code)
83. 10/13/1983 – 1st commercial telephone service by NTT
84. TACAN – 960 M to 1215 M
85. VOR – 108 to 118M
86. Smith chart – transmission line calculator
87. VDSL – 52 Mbps downstream/ 2.3 Mbps upstream
88. H21 – 32.768 Mbps
89. B channel of ISDN – email; 4.8 to 64 kbps
90. chirp – SS technique; carrier frequency is linearly moved or shifted through its BW
91. WAP - for sharing via wireless access instead of wires
92. WEP – wired equivalent privacy; 64/128/256 bit encryption
93. SEG – for special effects in TV (special effects group)
94. IVDS – Interactive Video and Data Service; 218-218.5/218.5-219 MHz
95. rad – amount of exposure
96. rbe – biological impact
97. Y video – requires 0.8µs delay
98. temporary permit of MPSCD – 3 months
99. Office Order 86-8-2004 – permit for MPSCD
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