Communications Engineering Coaching Materials: Section 5 Module 19

This is the Section 5 Module 19 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 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


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