Communications Engineering Coaching Materials: Section 5 Module 19

This is the Section 5 Module 19 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 19

QUESTIONS	ANSWERS
1. K index which means “severe storm”	K7
2. K index which means extremely severe storm	K9
3. DVD standard meaning single sided, single layer	DVD-5
4. DVD standard meaning single sided, double layer	DVD-9
5. DVD standard meaning double sided, single layer	DVD-10
6. DVD standard meaning double sided, double layer	DVD-14
7. Blu-ray disc has a capacity of	50GB
8. Wavelength of laser diode light used by DVD	650 nm
9. Time it takes in sending a 1MB image via telephone modem with a speed of 28.8 kbps	300 sec
10. To avoid interference between adjacent satellites, geostationary satellites operating in C band must be separated by how many degrees?	2 degrees
11. The unidirectional propagation of a rhombic antenna is caused by its	Termination resistance
12. The radiation … of a grounded vertical antenna can be maximized by	Using top hats, loading coils and ground radials “ALL OF THE ABOVE”
13. Class of mobile phones that can be connected to GPRS and GSM one at a time	Class C
14. Class of mobile phones that can be connected to GPRS and GSM simultaneously	Class A
15. The word “Base” in 10BaseT means	the cable carries a baseband signal
16. 10BaseT cable typically uses	RJ45 connector
17. In CSMA/CD, all collisions must be	Detected
18. A backbone network equipment that works in the data and network layer	router
19. A point in the orbit of a planet that is farthest from the sun	Aphelion
20. Frequency range of Ku-band	12-14 GHz
21. Typically, the velocity factor of the materials used in transmission lines range from	0.6-0.9
22. The dielectric constants of materials commonly used in transmission lines range from about	2.8-3.5
23. Typical storage temperature range for fiber optical cable installation	-30 to 70 degrees Celsius
24. Standard diameter for cladding used in the single-mode step-index fiber used in communications	125 micrometers
25. Standard bending radius during fiber cable installation for external armored fiber cables	350 mm
26. Weight of fiber optic cable	10 pounds per 1000 feet
27. Connection-oriented, Used to transport large amounts of telephone and data traffic to allow interoperability between equipment and different vendors	ATM
28. Rate of digital communication that is achievable with single-mode step-index fiber	2GB
29. Transponder bandwidth used in satellite	36MHz
30. NAVSTAR GPS completes its orbital path in	12 hrs.
31. The low-level signal from the output of a detector is	Applied to the AF amplifier
32. The space craft that brought the first creature to space on November 3, 1957	Sputnik 2
33. Time constant of pre-emphasis	75 microseconds
34. “prime time” in Philippine cable television is from	6:00-11:00 PM
35. Frequency range of channel 6	82-88 MHz
36. Regional coding for DVD discs and players used in Asia.	Region 3
37. Usual heater voltage for picture tubes used in television	6.3 V
38. Typical anode capacitance of television picture tubes	2000pF
39. Typical voltage of ULTOR for 35-inch TV picture tubes	30kV
40. The maximum noise figure without equalizer for CATV at 54MHz must be kept at	7.5dB
41. In CCTV system,___ allows the observer to see the location, speed and direction of a person in the field of view. For this purpose, the image of the person must not be less than 5% of the screen height	Monitoring
42. For recognition purposes, the image of the person must not be less than ___ of the screen height	50%
43. In CCTV system, ___ allows the observer to locate a person with a high degree of certainty having been prompted to do so by a guard, police, alarm system or other means. For this purpose, the image of the person must not be less than 10% of the screen height	Detection
44. In CCTV system, ___ allows the observer to say with high degree of certainty that the person on the monitor is the same one they have seen before	Recognition
45. For ___ purposes, the image of the person must not be less than 120% of the screen height	Identification
46. What is the total number of C band transponders are there in Agila 2	30
47. Typical mating durability in fiber optics	0.2 dB per 1000 matings
48. TDM frame used in fiber optics	DS-5
49. Magnetic loops overlying a solar inversion	Arcade
50. Area between sunset and sunrise	Gray line
51. Rotatable antenna used in shortwave radio broadcasting	ALLISS
52. Bandwidth of GSM	200 KHz
53. Uplink data rate of GPRS	14Kbps
54. Download using GPRS	28-64KHz
55. Modem fax 4	120%
56. Area bounded by cellphone	26 sq. meter
57. FDDI that permits the transmission of voice and video over the same cable as the normal FDDI token passing	FDDI II
58. A frame that has a total content of 2430 bytes in SDH framing	STM-1
59. Class 3 UTP	16 Mbps
60. First cellular	1984
61. Tolerable deviation in SSB	+/- 50Hz
62. Maximum run-length of RJ59	350nm
63. Low level frequency	1 KHz-299 KHz
64. In the wifi world, a proprietary channel bonding equipment that can boost network upto 108 Mbps	Super G
65. In the radio spectrum, what frequencies are used for deep space radio communications?	2.29-2.3GHz
66. FCC digital radio	2.31-2.36 GHz
67. Capacity in Gibibyte (GiB) of a 12 cm type DVD	4.37
68. ISS orbital rotation	91.34 minutes
69. Characteristic attenuation of a plastic optic fiber	1 dB/m
70. Frequency range of P band	216-450 MHz
71. Frequency range of H band	7.05-10.10 GHz
72. Frequency range of R band	1.7-2.6 GHz
73. Maximum power output of PCS1900 E1	30 dBm`
74. Maximum power output of PCS1900 E2	26 dBm
75. Maximum power output of PCS1900 E3	22 dBm
76. EDGE GSM E1 mobile power class supporting 8-PSK modulation nominal power output	33 dBm
77. EDGE GSM E2 mobile power class supporting 8-PSK modulation nominal power output	27 dBm
78. EDGE GSM E3 mobile power class supporting 8-PSK modulation nominal power output	23 dBm
79. Number of symbols used in ASCII	128
80. Channel that allows only one dominant channel to operate during nighttime and covers a wide area	Clear channel
81. Reassembling packets and cells	ATM adaptive Channel
82. a phase-locked loop used for carrier phase recovery from suppressed-carrier modulation	Costas loop
83. Above 108 Mbps	Backscatter
84. Standard bending radius during installation for a lightweight fiber cable	70mm
85. Long term bend radius	50mm
86. Standard bending radius for long term use for an external armored fiber cables	175mm
87. Cable diameter of lightweight internal fiber cable	4.8mm
88. Long term bending radius for direct burial fiber cables	150mm
89. Typical value of vidicon dark current	0.2 micro Amperes
90. In CCTV system, for identification purposes the image of the person will not be less than ___ of the screen	120%
91. Tuning eliminates	Echo, jitter, harmonic distortion “ALL OF THE ABOVE”
92. In error control ion networks,___ refers to the opposite of controlled access where computers wait until the circuit is free and then transmit whenever they have data to send and commonly used in Ethernet LANS	Contention
93. Concert pitch	A440
94. Number of bits in the destination address in IPv6	1944 bits
95. Index of geomagnetic activity	A-K indeces
96. How much more is the feedpoint Z in a folded dipole than in a normal dipole	4 times
97. Requires fiber optics cable	DS-5
98. Use of loading coil	Increase the effective length
99. Efficiency of Class 4 modem	120%
100. Shielding the fiber optics cable eliminates	Crosstalk, intermodal noise “ALL OF THE ABOVE”
101. The velocity of sound that is equal to the square root of absolute temperature is ___ times greater at 20 °C	12
102. In TDMA framed D-AMPS, the number of bits per frame is ____	128
103. Propagation used when MUF is greater than 30GHz	Backscatter
104.	6 dB better

Complete List of Communications Engineering Coaching Materials

Communications Engineering Coaching Materials

---