PinoyBIX Engineering Problem Solving and Reference

Below are the answers key for the 100 items set of Practice Examination 13 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. b) Perigee

2. b) FM/TV Stereo

3. c) 1540 kHz

4. b) Refraction

5. b) Reflectometer

6. d) Increase its directivity

7. b) Major lobe radiation

8. b) Efficient use and equitable access.

9. a.) 205 Ω

10. a.) 405.050 MHz

11. b.) Can handle high power signal

12. b.) They process digital information

13. d.) A radio telegraph operator

14. d.) 6.312 Mb/s

15. b.) 90

16. b.) 4.75 MHz

17. d.) Antenna which can be used on more than one band due to the use of parallel LC networks.

18. b.) 20 Hz

19. b.) Sleeve

20. d.) 1.55 ft.

21. d.) Properties of the medium

22. b.) Intermodulation

23. a.) Injection laser diode

24. c.) DCS-1800

25. c.) Digital, analog

26. a.) A3F

27. c.) Bandwidth

28. c.) ITU-T

29. d.) 3-30 kHz

30. d.) A fixed point in an electromagnetic wave

31. c.) Stereo multiplex

32. b.) Direct to Home TV

33. b.) Noise margin

34. b.) Bits are transferred simultaneously

35. d.) 150 MHz

36. c.) 2000 Ω

37. d.) Effective boresight area

38. d.) Serial transmission

39. c.) Aperture antenna

40. d.) 600 ms.

41. c.) Grounded

42. b.) A higher refractive index than the cladding

43. d.) Provide loading coil

44. c.) Increase

45. d.) High power

46. d.) Riser terminal

47. c.) Blocked call

48. c.) Baseband signals

49. a.) Geocenter

50. c.) Yellow

51. c.) Corona discharge

52. c.) Modulation

53. c.) Loading coil

54. c.) C

55. d.) To minimize interference between signals at received end

56. c.) Very weak signals might not be received.

57. c.) Employment of highly directional spot-beam

58. c.) Frequency

59. c.) 4.5 MHz

60. d.) Executive Order 467

61. d.) Council

62. d.) Ratio of the total cross-sectional area to the total cross-sectional area of the fiber bundle

63. b.) 1085 kHz

64. b.) Regulated supply

65. b.) For receiving low and high band stations.

66. c.) Snow

67. d.) Troposphere

68. d.) National Telecommunications Communication

69. d.) Carrier Harmonics

70. b.) Photoresistive Layer

71. d.) 535-1605 kHz

72. d.) Building cable

73. c.) 1.48 MHz to 1.4995 MHz

74. b.) Call completion

75. c.) 24 satellites

76. c.) Antenna efficiency

77. c.) 458 THz

78. b.) Diameter of the core must be very much greater than the wavelength of the light to be carried.

79. d.) Mechanical filter

80. b.) Serial interference standard

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• Communications Engineering Exam 14: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 12 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. c.) Impulse Noise

2. c.) The strong part.

3. d.) Desensitizing

4. d.) Advance Mobile Phone Services (AMPS)

5. c.) Ship Earth Station

6. b.) 190 mV/m

7. d.) 935-960 MHz; 890-915 MHz

8. d.) 9 kHz

9. b.) 4.5 MHz

10. c.) Double-Conversion

11. b.) Crosstalk

12. b.) By using push-pull amplifier

13. a.) FM

14. b.) Cross-modulation Interference

15. c.) To improve the receiver’s noise figure.

16. b.) ERP

17. d.) The antenna will be physically very large.

18. c.) Ribbon cable

19. d.) Integrity of data

20. b.) Allocates frequency bands for the services and determine the principle of distribution of orbit/spectrum resources

21. b.) Optical fiber

22. c.) Hub

23. c.) Bus

24. d.) Mesh

25. c.) Protocol analyzer

26. a.) Distress

27. d.) 40-75 GHz

28. a.) The numerical ratio relating the radiated signal strength of an antenna to that of another antenna.

29. d.) It may be used for multiband operations

30. c.) 0.25 wavelength

31. c.) N.S. Kapany

32. a.) It is about 5% longer.

33. a.) At the ends

34. d.) To tune out the capacitive resistance.

35. a.) A circuit for detecting FM signals

36. a.) The time required to complete one cycle.

37. a.) EO 467

38. a.) GMDSS

39. c.) Bridge

40. a.) TDM

41. c.) f_IF

42. c.) Better Signal Penetration

43. b.) Secondary service area

44. a.) Non-resonant Type

45. c.) D

46. c.) 2 kHz

47. d.) Excite

48. a.) Vertical

49. a.) 3

50. d.) 500 MHz

51. a.) Infrared

52. c.) Fax modem

53. b.) DSB

54. a.) J3E

55. b.) F3E

56. b.) Spectrum Analyzer

57. d.) 140 dB

58. b.) Hand-off

59. b.) MTSO

60. c.) Rhombic

61. c.) P

62. d.) Spurious Signal

63. b.) Broadcasting

64. b.) Add an inductor in series

65. b.) ½ wavelength

66. b.) Node

67. d.) Dial-up

68. b.) Descending node

69. a.) C-Band

70. a.) Local area network

71. c.) Coaxial cable

72. c.) Free space medium

73. b.) Type of modulation of the main carrier

74. c.) Handshake

75. b.) Signal generator

76. c.) Gateway

77. a.) Frequency-division multiplexing

78. d.) Protocol

79. d.) Mobile earth station

80. b.) FM receiver is basically insensitive to amplitude modulation

81. b.) Holding memory

82. a.) The only way to produce an emission F3E signal is with a reactance modulator on the oscillator.

83. c.) Newtons per meter squared

84. c.) Congestion control

85. b.) Detector speed

86. b.) IMTS

87. c.) Nonsynchronous satellite

88. c.) Stereo multiplex

89. d.) High attenuation

90. d.) Cladding thickness is greater than the radius of the core and the diameter of the core must be much greater than the wavelength of the light to be carried.

91. b) WAN

92. c) Polling

93. d) To improve the receiver’s noise figure.

94. d) Use of less repeaters.

95. a) Interconnection

96. b) Λ/4

97. d) Cell to Mobile unit

98. b) Duplex Operation

99. d) First

100. c. A3C

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• Communications Engineering Exam 13: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 11 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. a.) EO 59

2. c.) 50 Hz

3. d.) Horizontal

4. d.) Horizontal

5. a.) Index of Refraction

6. a.) Doughnut Shape

7. a.) Shock Wave

8. b.) High Usage Hour

9. d.) Presbycusis

10. b.) HF

11. a.) Vocoder

12. d.) Ferrite Isolator

13. a.) Guard

14. a.) Pacing

15. c.) Detector

16. a.) Minimum

17. a.) GSM

18. d.) Posigrade

19. b.) An equipment resistance that would dissipate the same amount of power as that radiated from an antenna

20. b.) Direct connection with the use of a null modem.

21. a.) Frequency Discriminator

22. b.) Modal Delay Spreading

23. c.) Three Lines

24. c.) Master Oscillator

25. c.) Regulate the power supply voltage

26. d.) Velocity Factor

27. b.) Weak Part

28. a.) 15 kHz

29. d.) The loudest signal received is the only demodulated signal.

30. c.) Bicone

31. c.) Echo time of the object to the source.

32. d.) 29.15 mi

33. b.) 300 – 3400 Hz

34. a.) NMT

35. b.) Interlaced Scanning

36. d.) Ultraviolet

37. d.) It is about 5% shorter.

38. b.) Antenna Gain

39. a.) High SWR

40. a.) Modem

41. a.) Antenna Bandwidth

42. b.) Cache

43. a.) Electric and Magnetic Field

44. b.) Using heat that would burn the image into heat.

45. a.) Service Entrance

46. a.) coaxial cable

47. a.) National Telecommunication Commission

48. a.) 95 – 100 dB

49. a.) F3E

50. b.) F₂

51. a.) modulation

52. c.) 0.34 m

53. a.) scanning

54. b.) variable resistance

55. a.) Public Telephone System

56. d.) Secondary Service Area

57. a.) bandwidth

58. b.) 262.5

59. d.) Period

60. a.) The characteristic impedance decreases.

61. c.) NTC

62. a.) PAM

63. b.) b and c

64. b.) SONAR

65. c.) Installing a filter at the receiver

66. d.) Transmitter

67. b.) Frequency Multiplier

68. a.) The radio of deviation frequency and modulating

69. d.) Multi frequency band operation

70. d.) Longitudinal

71. b.) Provision of radio telegraph operator

72. a.) Centripetal acceleration

73. d.) Silicon Crystal

74. c.) PL-259

75. d.) 1MHz – 500MHz

76. a.) 1

77. d.) Desensitizing

78. d.) Analog

79. b.) Can be used for multiband operation.

80. b.) sample and hold

81. c.) Heating in the oscillator device causing a change in electrical characteristics.

82. b.) Cancellation of its authority.

83. c.) Bandwidth

84. a.) Poor soldered connections.

85. b.) 16H

86. d.) Bulky

87. c.) Connection

88. b.) Producing sum and difference of two frequencies from a combination of two signals.

89. d.) As pure inductor

90. d.) Carry out loopback test.

91. d.) System Network Architecture

92. d.) R.A. 7925

93. b.) Segmentation

94. c.) 22,300 mi

95. c.) Diplexer

96. b.) Threshold of Pain

97. c.) J

98. b.) 312 to 552 kHz

99. d.) Metric

100. c.) 4.5 MHz

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• Communications Engineering Exam 12: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 10 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. WAP

2. Impulse noise

3. 0.38 db

4. 20%

5. 70 MHz

6. X modem

7. Spacing bias distortion

8. 317 W

9. GPRS

10. COW

11. A variable LC oscillator with metered feedback current

12. Two or more antennas operating on the same frequency

13. Video detector

14. 258

15. In the nonlinear region

16. 64 kbps

17. 3 kHz

18. 50 dB

19. R3E

20. 30 MHz

21. Cathode end of the helix

22. Antenna directivity

23. 14

24. A3J

25. Free space

26. Loudness

27. 15

28. Homing

29. The amount of radiation received from the sun

30. The noise floor of the receiver

31. 1000 Hz

32. Poor front-end selectivity

33. VHF

34. H bend

35. 1.25 MHz

36. Horizontal

37. Zone of silence

38. 20 %

39. STX

40. Wow

41. When 60% of the capital is owned by Filipino citizens

42. Logatom

43. Because their power is increased by class C amplifiers

44. 1361.25 W

45. ITU-W

46. Neutralization

47. PLL

48. Logical

49. 0.635 to 15.24 cm

50. 44.736 Mbps

51. Nature of multiplexing

52. 500 Hz

53. ITU-T

54. 2174.5 kHz

55. Power margin

56. Load water

57. Dark conductance

58. One upper sideband

59. Directional coupler

60. Optical media board

61. AB test

62. V series

63. T4

64. 40 dB

65. 96

66. Lambertian source

67. 30 to 53 kHz

68. 125,000

69. Fresnel reflection

70. World telecommunication standardization conference

71. Fringe area

72. Grass

73. Vertical Marconi antenna

74. The audio section

75. Mush

76. Waveguide switch

77. 10 W

78. Quad

79. Double-balanced

80. X-rays

81. Convergence

82. Department Order No. 5

83. Master

84. Marconi antenna

85. Discriminator

86. Character

87. Interpolator

88. 239 ms

89. 1 pW

90. Sunspot

91. Prominence

92. Filament

93. 10.7 cm band

94. 32,000 nT

95. 62,000 nT

96. Picosat

97. Sputnik 2

98. CDMA

99. 2.5G

100. Bluetooth

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• Communications Engineering Exam 11: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 9 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. Timbre

2. 3300 m/s

3. 20 phons

4. 2λ to 8λ

5. 3100 kHz

6. 800

7. Effective Isotropic Radiated Power (EIRP)

8. Effective Radiated Power (ERP)

9. Gain-to-Equivalent Noise Temperature Ratio (G/T_e)

10. Space noise

11. Hoghorn

12. 24

13. Space Division Multiplexing (SDM)

14. T2 carrier system

15. Metric

16. Spin stabilization

17. Membrane absorber

18. Syncom III

19. Calculate load admittance

20. A specially configured coaxial transmission line

21. Emission

22. 1887

23. Attenuation of radio wave

24. A parallel LC circuit

25. Courier

26. RA 9292

27. The President

28. 5

29. Within 15 days

30. 1

31. All of the choices

32. Solid

33. 1

34. Both A and C above

35. A 125-μs frame

36. L carrier

37. 564 – 3084 kHz

38. Dual polarization

39. 39.2 dB

40. 1.09

41. 275 ms

42. 0.5 s

43. 128

44. 5.4 MHz

45. 0.871 μW

46. 4 MHz

47. 4130 km

48. F₂ layer

49. 47

50. 1.6 octaves

51. 3 times

52. 44.736

53. 358

54. Superrefraction

55. Temperature inversion

56. Duct

57. 1.35 cm and 1.7 mm

58. 5 mm and 2.5 mm

59. Ionosonde

60. 1100 km

61. 11.53 m/s

62. 343 m/s

63. 120 Hz

64. 320 kHz

65. D

66. Refraction

67. Using the smallest possible radiation angle and highest possible frequency

68. 32 km

69. 3853 Hz

70. NTT

71. 0.704 fF

72. Transponder

73. 35.3

74. Critical frequency

75. Frequency response

76. water vapor and oxygen

77. either elliptical or circular

78. Employment of highly directional spot-beam antennas

79. footprint

80. 440 Hz

81. 435

82. lower

83. 39.7 W

84. IS-95

85. 31.5 W

86. 10 Base T

87. 150 W

88. PD 576-A

89. 37.6 W

90. 13 kbps

91. 126 W

92. MC No. 2-05-88

93. 60 W

94. Hash

95. Twisted pair

96. EDGE

97. 12:00 Midnight to 5:00 AM

98. public-key encryption

99. 8 kbps

100. 7:8

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• Communications Engineering Exam 10: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 8 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. 0.99

2. Huygen’s principle

3. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.

4. Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

5. Radio waves may be bent.

6. Tropospheric ducting

7. The ratio between the deviation of a frequency modulated signal and the modulating frequency.

8. knife-edge diffraction

9. 60 cm

10. Radiation resistance plus ohmic resistance

11. A wave consisting of an electric field and a magnetic field at right angles to each other

12. 300 – 3000 MHz

13. 90 degrees

14. 40 km

15. The electric field is parallel to the earth.

16. The electric field rotates

17. 72 km

18. 36 meters high

19. Microwave

20. Salt water

21. 300 ohms

22. Frequency hopping

23. 0.66

24. 6 watts

25. Dielectrics in the line

26. Direct sequence

27. 30 to 300 kHz

28. 3 MHz to 30 MHz

29. 700 MHz

30. D

31. lowest, highest

32. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum.

33. Velocity factor

34. RF energy moves slower along the coaxial cable

35. 3.51 meters

36. Optimum useable frequency (OUF).

37. 1.66

38. 300 MHz to 3 GHz

39. 4250 MHz to 4350 MHz

40. A frequency modulated continuous wave

41. Is the same direction as the electrostatic field of the antenna.

42. 1 watt

43. When comparing the gains of directional antennas

44. vertical, horizontal

45. Gain increases 6 dB

46. 118.000 MHz to 136.975 MHz (worldwide up to 151.975 MHz)

47. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station

48.1.5

49. 2ξ_d

50. Space wave

51. 100 Hz

52. Both VLF and LF

53. Virtual height

54. 300 km

55. Flexible coaxial line

56. ½ to 2/3

57. 100 x 10³ m/s

58. 0.25

59. 2.76 x 10^-9 S/m

60. 150 Ω

61. 1.67

62. 2.8

63. The beamwidth decreases as the gain is increased.

64. 660 kHz

65. 2500 Ω

66. 352 m³

67. 0.8 – 1.2 sec.

68. 99.7 MHz

69. 999.8 kHz, 1000 kHz, and 1000.2 kHz

70. IF amplifier

71. Space noise

72. 500 Hz

73. Between 15 to 60

74. 0.54

75. 10,800

76. 2.089

77. The standing wave ratio is one.

78. The power traveling from the transmitter to the antenna.

79. The American National Standards Institute (ANSI).

80. internal receiver noise.

81. final RF stage

82. Midday

83. ± 12 KHz

84. Goniometer

85. GMDSS

86. Helical

87. an impedance mismatch between the load and the line.

88. Calorimeter

89. . Dominant mode

90. Doppler effect

91. 1.35 cm and 1.7 mm

92. 5 mm and 2.5 mm

93. 4130 km

94. F₂ layer

95. distance-to-reuse ratio (D/R)

96. Frequency agility

97. Hexagon

98. 6

99. 10^-12 W/m²

100. 5150 m/s

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• Communications Engineering Exam 9: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

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Below are the answers key for the 100 items set of Practice Examination 7 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. 14.14 mi

2. 25 mi

3. 179 dB

4. 6.065 GHz

5. 72 Mbps

6. 4 MHz

7. 36 MHz

8. 500 MHz

9. 5.925 GHz

10. 12

11. X band

12. L

13. Ku

14. TTC

15. Attitude control subsystem

16. 40 MHz

17. 14 to 14.5 GHz

18. Iridium

19. Polar

20. L band

21. 2400

22. GPS

23. 10,898 nmi

24. 12 h

25. Ephemeris

26. 55˚

27. PVC

28. 2.27

29. teflon

30. 301 Ω

31. 50 Ω

32. 0.1

33. 0.219 ft

34. 0.82 ft

35. PL-259

36. BNC

37. F-type connector

38. N-type connector

39. 0.5 to 0.9

40. 0.6 to 0.8

41. 0.9

42. Twin-lead

43. 0.68

44. 75 ns

45. Delay line

46. 115.6 ns

47. 166.5˚

48. 93 Ω

49. 116.8 nH/ft

50. Either A or C

51. Cognitive

52. Rhythm

53. Speech

54. Simple

55. 40 dB

56. 4

57. interval

58. 2 to 1

59. 106

60. 5^th, 6^th and 7^th

61. 4 times louder

62. 6 to 10 dB

63. 80 dB

64. Echo

65. Transmission loss

66. 76 kHz

67. 15.6 dB

68. 3.2 x 10^-4 W/m²

69. 1 x 10^-7W/m²

70. 14.5 dB

71. 10.5 dB

72. Very loud

73. 150 dB

74. 114 dB

75. 3300

76. 1.6 to 1.8 s

77. 3.1

78. Reverberation

79. Helmholtz resonator

80. 1250

81. 30

82. 16.28

83. -1.25 dB

84. 49

85. 7.04°

86. 4.4 MHz

87. 9.1 W

88. James C. Maxwell

89. . Polarization

90. Troposcatter

91. 0°

92. 112 Ω

93. Ultrasonic

94. 30.72 kHz

95. 618

96. 11.07

97. 10 – 1000 microwatts

98. 5.6

99. 11.16

100. 40

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• Communications Engineering Exam 8: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 6 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. 150 watts

2. During experimental period

3. High VHF band

4. DC and RF heating of resistors, causing then to change values.

5. E

6. Mobile radio

7. Carrier

8. 100 times bigger

9. Helical

10. Pulse generator laser

11. com

12. An equivalent resistance that would dissipate the same amount of power as that radiated from an antenna

13. Back wave

14. Immunity to noise

15. Photovoltaic effect

16. Telstar I

17. 30 to 300 GHz

18. Suppressed white noise

19. Secondary

20. F

21. Computer data

22. 401.00625 MHz

23. 80,000 watts

24. Clear to send

25. 0% modulation

26. Radio operator telegraphy onboard

27. Binary form

28. Necessary bandwidth

29. Local oscillator

30. One at a time

31. Loose connections in the oscillator, amplifier, or antenna circuits.

32. Antenna

33. Mean power

34. 235.50 MHz

35. 8

36. video stage gain

37. 6 dB

38. gov

39. Dept. order 88

40. UHF band

41. Four

42. Electromagnetic

43. 1.0025 MHz

44. Dynamic instability

45. Transmitter, channel and receiver

46. CCIR

47. Call waiting tone

48. Bandwidth

49. 401.0125 MHz

50. Closer coupling between the oscillator and the antenna.

51. Double sideband full carrier

52. 405.050 MHz

53. Value-added service provided

54. Two way simultaneous transmission

55. A

56. Balun

57. Contrast

58. Mu-law

59. Type of modulation of the main carrier

60. NTC

61. Antenna efficiency

62. MF band

63. Dielectrics in the line

64. Uniform resource locator

65. Spark emission

66. Geosynchronous satellite

67. Hertzian waves

68. 20

69. The transmitter and receiver

70. The ratio of the maximum carrier frequency deviation to the highest audio modulation frequency

71. Retarder

72. R.A. No. 3396

73. Time division

74. Technical, legal and financial

75. MOPA

76. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum

77. Physical dimension

78. Semi-graded multimode

79. Spot beam

80. Phase control

81. Local oscillator, mixer and RF amplifier

82. Use of dummy antenna

83. Balanced line

84. Use of regulated power supply

85. 120 ohms

86. By application of antireflection coating

87. To reduce the possibility of internal arcing

88. Optic regenerators

89. Sputnik I

90. Frequency

91. Propagation delay

92. Thunderstorm

93. Modem

94. Power margin

95. Modem

96. Holding time

97. More bandwidth than analog

98. 3 ch.

99. Heating of capacitor in the oscillator

100. Over-modulated

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• Communications Engineering Exam 7: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 5 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. Two or more antennas operating on the same frequency

2. Antenna gain

3. Base station

4. High power

5. X

6. C

7. Saturation

8. Center of the antenna

9. By installing a good ground radial system

10. Around 500 miles

11. Efficiency = radiation resistance/total resistance x 100%

12. Aural broadcast STL

13. Snell’s

14. 156.8 MHz

15. Gateway

16. Telecommand

17. A variable LC oscillator with metered feedback current

18. A3E and F3C

19. In terms of peak envelop power

20. 0 degrees latitude

21. loading coil

22. The frequency range over which and antenna can be expected to perform well

23. TDMA

24. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.

25. At feed point

26. Whip

27. Carrier power

28. Sunspots

29. A3E

30. Franchise

31. 200 kHz

32. FM

33. A non-radiating load for a transmitter used for testing

34. Bidirectional

35. Global beam

36. Gaussian minimum shift keying

37. Laser

38. Communication

39. Velocity factor

40. Circulator

41. Slope overload

42. Space station

43. 0.31250 GHz

44. Transmission system engineering

45. LAN

46. Land station

47. The combination of two signals to produce sum and difference frequencies.

48. Amplitude modulation

49. Thermal agitation

50. Horizontal aiming of the antenna

51. The time required to complete one cycle

52. Throughput

53. 42.5%

54. Stack

55. The element fed by the transmission line

56. Peak limiting

57. Radiation

58. Drift

59. 10100

60. 4:1

61. Frequency

62. V.1

63. Reduced carrier single sideband emission

64. Phonoscope

65. 50 kW

66. 110011

67. Iridium system

68. Modulator

69. Down link

70. Violet

71. Resonant

72. Broadcast

73. Maximum voltage and minimum current.

74. Synchronous optical network

75. Through installing a band-pass filter in the antenna feed line

76. Tropospheric ducting

77. Longer it can reach

78. 40 dB

79. The electric field is parallel to the earth

80. Television

81. Decrease the receiver squelch, gain.

82. Optical repeater

83. Low noise amplifier

84. Facsimile

85. Crossfire

86. In the receiver front end

87. Synchronous data transfer scheme

88. Vestigial sideband

89. 8.36 kW

90. Class C

91. E.O. 109

92. Mixer

93. 20 Hz

94. A wave consisting of an electric field and a magnetic field at right angles to each other.

95. 3.4 to 6.424 GHz

96. Packet mode

97. Yagi antenna

98. A circuit for detecting FM signals

99. Terminal adapters

100. Department of transportation and communications

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• Communications Engineering Exam 6: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

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Below are the answers key for the 100 items set of Practice Examination 4 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. 8 to 1.43 GHz

2. Ultraviolet

3. Dipole

4. Type of modulation of the main carrier

5. Half-duplex operation

6. Emission

7. Type of information to be transmitted

8. Television

9. Omnidirectional

10. Chroma keying

11. 50 dB

12. Telemetry

13. 1 dB

14. All of these

15. Isotropic

16. PAM

17. Ionospheric scatter

18. All of these

19. Pitch

20. Stereo multiplexing

21. Out of the band

22. Circular polarization

23. Impulse noise

24. Reflectometer

25. Reduce carrier single sideband emission

26. Land station

27. Vertical polarization

28. Telstar 1

29. T1

30. 768 kbps

31. APDs

32. 4.78 µV

33. 1.28 x 10^-19 J

34. 34.61 ns

35. 4 KHz

36. Space diversity

37. Noise improvement factor

38. Huygen’s Principle

39. Continuous modulation

40. 30 MHz

41. F1 layer

42. Bidirectional

43. 28.17 dB

44. Linearly

45. Optical attenuator

46. TE

47. Necessary bandwidth

48. Smith chart

49. 8.2345 MHz

50. Horizontal polarization

51. Telecommand

52. ERP

53. 14/11 GHz

54. ASK

55. Beamwidth

56. NPR

57. Administration

58. Woofer

59. Below 2 GHz

60. 511

61. 8.8 dB

62. Satellite disk

63. Interference to adjacent channel

64. Carrier power

65. Volume

66. E.O. 109

67. Mobile service

68. More

69. Aeronautical fixed service

70. Low pass filter

71. Diffraction

72. Geosynchronous

73. Noise equivalent power

74. Major lobe radiation

75. 300 - 3400 Hz

76. 5925 MHz

77. Input and output

78. dP/dA

79. Fundamental

80. Parasitic elements

81. A higher index of refraction than the cladding

82. Adding C in series

83. 66.66 W

84. Pulsed modulation

85. Troposcatter

86. Spot beam

87. 1.76 dB

88. Satellite network

89. Quantizing noise

90. Stack

91. Coast station

92. Pulse modulation

93. A

94. Rayleigh scattering loss

95. No answer

96. Analogue cellular

97. Effective boresight area

98. 20 kHz

99. TVRO

100. Flare

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• Communications Engineering Exam 5: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

---

Below are the answers key for the 100 items set of Practice Examination 3 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. 100 Ω

2. 156 Ω

3. Single line wire

4. 6 dB

5. Balun

6. 75 Ω

7. 3

8. Shannon-Hartley theorem

9. Duplex

10. 15 to 160 Mhz

11. 290 Kelvin

12. 800 Hz

13. Quantizing level

14. Noise

15. NPR

16. pWp

17. 50%

18. A3J

19. Limiter

20. Much better noise immunity

21. 71

22. Constant peak amplitude

23. H3E

24. Class C

25. Varying of some parameters of a carrier such as its amplitude to transmit information

26. Assures that the telephone is working

27. 0 dBm

28. 36 CCS

29. Facsimile

30. 100

31. 1 TU

32. Refraction

33. Maximum usable frequency

34. James Clerk Maxwell

35. Ionospheric scatter

36. F2

37. Wavelength

38. F layer

39. 8500 km

40. Vertical

41. Azimuth

42. Rhombic

43. Orthomode transducer

44. 10.89 times

45. Standing waves

46. 200 kph

47. 3

48. Dummy antenna

49. Antenna

50. 42.9 MHz

51. Two-way simultaneous transmission

52. Polling

53. They have clock recovery circuits

54. 2B+D

55. Data communication equipment

56. STX

57. To protect small signals in PCM from quantizing distortion

58. Is concerned with the boundaries between characters

59. Spectral analysis

60. X.75

61. Asynchronous

62. Folding frequency

63. Baseband

64. Huffman code

65. Shannon-hartley theorem

66. Totally different

67. Sampling, quantizing, and coding

68. Duplex

69. LNB

70. Gallium Arsenide solar panel

71. Satellite radiation pattern

72. 38

73. 0.38 dB

74. LED

75. Step-index multimode

76. 800 THz

77. 50,000 h

78. Sound intensity

79. Flanking transmission

80. 89.1 dB

81. Fundamental

82. 10 log I/I(ref)

83. Diffraction

84. Volume unit meter

85. 995 to 2055 KHz

86. Low band VHF

87. Antenna

88. Pan/tilt device

89. 5

90. 52 µs

91. Due to water vapor and oxygen

92. Distances involved are greater

93. 60 GHz

94. Radio detection and ranging

95. Terrestrial link

96. Shorten waveguide link

97. PD 223

98. E.O. No. 266

99. Act. No.`3846

100. Log

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• Communications Engineering Exam 4: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

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Below are the answers key for the 100 items set of Practice Examination 2 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. MF

2. DTE

3. Data terminal equipment (DTE)

4. the approximation of the quantized signal

5. convert current variations into sound waves

6. inverted

7. attenuation

8. Standing waves

9. noise is amplified with voice when an FDM system is used

10. Modulation index

11. Shorten the time delay for each channel

12. polling

13. 6

14. LSB and USB

15. standards for interfaces between terminals and modems

16. Tie trunk

17. 312 to 552 kHz

18. 64 kbps

19. Reflectometer

20. 270 kbps

21. 2.6

22. PAM

23. 2.656 watts

24. Satellite dish

25. 128

26. 20 kW

27. 240 Hz

28. is decreased

29. repeaters regenerate digital pulses and remove distortion

30. bridge

31. Angle

32. mode

33. Polling

34. ICAO

35. Bipolar

36. flattening

37. both electric and magnetic fields

38. 2:1

39. Downlink

40. TDM

41. dBr

42. 1.3 MHz

43. 1.23

44. PSK

45. RF carrier

46. 1

47. All of these

48. 1952

49. the positioning of data within a frame

50. 10 Mbps

51. 92.4 + 20 log f + 20 log d

52. Rhombic antenna

53. Early bird

54. 4

55. Bockham and Kao

56. C-band

57. Frequency

58. Polarization

59. Band reject filter

60. has 132 characters including 32 control characters

61. low-wattage light bulb

62. resistive load at the resonant frequency

63. 140.89 dB

64. 40 dBm

65. ion propulsion system

66. IMPATT

67. transfer maximum power to the load

68. 300,000 km/sec

69. are reflected from the walls but do not travel along them

70. agreed upon in advance between sender and receiver

71. Discrete channel

72. Molten

73. dolby

74. The clocking is derived from the data in synchronous

75. 22

76. A3

77. Sound intensity

78. effective height

79. Induction coil

80. Moon

81. interface digital terminal equipment to analog communications channel

82. 3700 Hz

83. H3E

84. 0 to 4 kHz

85. 10^-6m

86. Surface loam soil

87. UHF

88. Mel

89. Electromagnetic

90. 64 kbps

91. horizontally polarized

92. 0.0465 cm

93. 14 ns

94. 52 µsec

95. 3 dB

96. 35

97. two or more antennas operating on the same frequencies

98. Isochronous

99. SIM

100. Radio survey

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• Communications Engineering Exam 3: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

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Below are the answers key for the 100 items set of Practice Examination 1 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.

1. Cladding

2. helical

3. 7 and ½

4. 300

5. 1 mW

6. obtaining your fixes location over large distances

7. less amplification for low signal levels

8. obtaining fixes over large distances

9. -90 dBm

10. Code

11. 4/3

12. 83 B

13. effective isotropic radiated power

14. frequency-shift keying

15. RS-422A

16. aperiodic

17. 174 K

18. Diffraction

19. all of these

20. length

21. Generates a 1kHz note for Morse code reception

22. perigee

23. 45

24. gain of the antenna

25. the telephone network will pass direct current

26. isotropic antenna

27. 115.56 dBSPL

28. Communications satellite

29. pulse duration modulation

30. Two rectifiers in parallel with opposite polarities

31. 30 days

32. 1.086

33. independent sideband emission

34. space or direct

35. All of these are true

36. twice

37. Phase shift

38. 0.12 W

39. the clocking is derived from the data in synchronous transmission

40. D

41. 25

42. ½

43. indirect

44. 320 bps

45. agreed upon in advance between sender and receiver

46. -90 dBm

47. Hertz

48. PWM

49. To prevent amplified noise from reaching the loudspeaker during the absence of an incoming signal

50. A. bearing and distance indication

51. synchronous

52. infinite

53. To provide an acceptable replica of the information at the destination

54. The numeric ratio relating the radiated signal strength of an antenna to that of another antenna

55. the components are simpler, less costly, and more reliable

56. 2

57. 120 kHz

58. determined by the sender and receiver

59. 14 dB

60. 83%

61. 1.14 volts

62. Broadside array

63. improve the efficiency of data transfer

64. Yagi-uda

65. definite

66. 256 to 2048 Hz

67. balun

68. no

69. input

70. detector stage

71. 245 Hz

72. 132.29 Ω

73. a two-wire or four-wire communication circuit between the customer’s premise and central office

74. The equatorial regions

75. Quantizing

76. Beamwidth

77. Light emitting diode

78. Undergrounding

79. The interfering effect of other frequencies in a voice channel compared with a reference frequency of one kilohertz

80. Lies in the different definitions of the modulation index

81. unbalanced

82. 6 dB over the gain of one antenna

83. Residual noise level

84. band stop

85. 1000 lines

86. Ultraviolet absorption

87. Limiter

88. 2

89. 30 to 53 kHz

90. load connected to the output end of a transmission line

91. character oriented

92. ground

93. 0.66

94. 0 dB

95. 93

96. all of these

97. Log normal fading

98. local oscillator

99. Modem

100. No transmitter power is wasted in the carrier

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• Communications Engineering Exam 2: ECE Pre-Board

Complete List of Communications Engineering Exams: ECE Pre-Board

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