This is 100 items set of Practice Examination 5 in Communications Engineering (Electronics Systems and Technology) composed of previous Board Exams Questions. Read each questions and choices carefully! Choose the best answer. In the actual board, you have to answer 100 items in Communications Engineering within 5 hours. You have to get at least 70% to pass the subject. Communications Engineering is 30% of the total 100% Board Rating along with Mathematics (20%), General Engineering and Applied Sciences (20%) and Electronics Engineering (30%). Familiarize each and every questions to increase the chance of passing the ECE Board Examination.
Start the Test Yourself Exam 5
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1. ECE Board Exam April 1998
Space diversity transmission means transmitting and receiving on _______.
- A. Two or more antennas operating on two different frequencies
- B. Two or more identical frequencies
- C. Two or more antennas operating on the same frequency
- D. Two or more different frequency
2. ECE Board Exam April 1998
An increase in the effective power radiated by an antenna in a certain desired direction at the expense of power radiated in other directions.
- A. Antenna gain
- B. Antenna back lobe ration
- C. Antenna total ration
- D. Antenna efficiency
3. ECE Board Exam April 1998
A radio land station in the land mobile service
- A. Mobile station
- B. Land station
- C. Base station
- D. Ship earth station
4. ECE Board Exam April 1998
A major and basic advantage for the use of a klystron.
- A. High power
- B. Efficiency
- C. Lesser noise
- D. Cheaper
5. ECE Board Exam April 1998
A band where most military satellite often operate
- A. Ku
- B. C
- C. X
- D. L
6. ECE Board Exam April 1998
The final power amplifier in an FM transmitter usually operates class ______.
- A. AB
- B. C
- C. B
- D. A
7. ECE Board Exam April 1998
In television broadcasting vivid strong colors are often referred as _______.
- A. Saturation
- B. Hue
- C. Chrominance
- D. Luminance
8. ECE Board Exam April 1998
Where do the maximum current and minimum voltage values on a resonant Hertz dipole exist?
- A. Center of the antenna
- B. Near the end of the antenna
- C. Near the center of the antenna
- D. Ends of the antenna
9. ECE Board Exam April 1998
How can the antenna efficiency of an HF grounded vertical antenna be made comparable to that of a half-wave antenna?
- A. By lengthening the vertical
- B. By installing a good ground radial system
- C. By shortening the vertical
- D. By isolating the coax shield from ground
10. ECE Board Exam April 1998
At what distance is VHF propagation normally limited?
- A. Around 500 miles
- B. Around 1500 miles
- C. Around 2000 miles
- D. Around 1000 miles
11. ECE Board Exam April 1998
What is meant by the term antenna efficiency?
- A. Efficiency = effective radiated power/transmitter output x 100%
- B. Efficiency = radiation resistance/ transmission resistance
- C. Efficiency = total resistance/radiation resistance x 100%
- D. Efficiency = radiation resistance/total resistance x 100%
12. ECE Board Exam April 1998
This is referred to as a fixed radio station that broadcasts program material from studio to transmitter by radio link.
- A. Aural BC intercity relay
- B. Aural broadcast STL
- C. Shortwave station
- D. Remote-pickup
13. ECE Board Exam April 1998
What law does a light traveling in air optical fiber follow?
- A. Millman
- B. Snell’s
- C. Maxwell
- D. Huygen
14. ECE Board Exam April 1998
Which of the following is designated as the international distress, safety and calling frequency for radio telephony for stations of the maritime mobile service when using frequencies in the authorized bands between 156 and 174 MHz?
- A. 165.8 MHz
- B. 156.8 MHz
- C. 158.6 MHz
- D. 168.5 MHz
15. ECE Board Exam April 1998
A device that connects two dissimilar networks and performs the protocol conversion.
- A. Gateway
- B. Coupler
- C. Transformer
- D. Converter
16. ECE Board Exam April 1998
The use of telecommunication for the transmission of signals to initiate, modify or terminate functions of equipment at a distance.
- A. Tracking
- B. space command
- C. Telecommand
- D. Trunking
17. ECE Board Exam April 1998
Best described a dip-meter.
- A. A variable LC oscillator with metered feedback current
- B. An SWR meter
- C. A counter
- D. A field strength meter
18. ECE Board Exam April 1998
Refers to an emission designation for facsimile?
- A. J3E and F4E
- B. A3J and A4E
- C. A3E and F3C
- D. R3E and A3E
19. ECE Board Exam April 1998
How does a SSB transmitter output power normally expressed?
- A. Average power
- B. In terms of peak envelop power
- C. In terms of peak-to-peak power
- D. Peak power
20. ECE Board Exam April 1998
In satellite communication, the Geostationary satellites are conveniently located with respect to the equator at _______.
- A. 45 degrees latitude
- B. 90 degrees latitude
- C. 0 degrees latitude
- D. 5 degrees latitude
21. ECE Board Exam April 1998
Known as the technique for adding a series inductor at or near the center of an antenna element in order to cancel the capacitive reactance of an antenna.
- A. Dipole
- B. Center loading
- C. Reflector
- D. loading coil
22. ECE Board Exam April 1998
What is meant by the term antenna bandwidth
- A. Antenna length divided by the number of elements.
- B. The angle between the half-power radiation points
- C. The frequency range over which and antenna can be expected to perform well
- D. The angle formed between two imaginary line drawn through the ends of the elements
23. ECE Board Exam April 1998
A multiple access technique used in GSM cellular system
- A. TACS
- B. FDMA
- C. TDMA
- D. CDMA
24. ECE Board Exam April 1998
Refers to an effect of selective fading.
- A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.
- B. A fading effect caused by small changes in beam heading at the receiving station.
- C. A fading effect caused by the time differences between the receiving and transmitting stations.
- D. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station.
25. ECE Board Exam April 1998
Where the voltage node of a half-wave antenna does exists?
- A. At feed point
- B. Near the center
- C. At center
- D. Near the feed point
26. ECE Board Exam April 1998
This is a flexible vertical rod antenna commonly used on mobiles.
- A. Marconi
- B. Hertz
- C. Whip
- D. Ground plane
27. ECE Board Exam April 1998
Referred to as an average power from the radio transmitter supplied to the antenna transmission line taken during one radio frequency cycle under no modulation.
- A. Carrier power
- B. Rated power
- C. Peak envelop power
- D. Mean power
28. ECE Board Exam April 1998
_______ is a major cause of the sporadic-E condition
- A. Temperature inversions
- B. Sunspots
- C. Meteors
- D. Wind shear
29. ECE Board Exam April 1998
Which of the following refers to a double side band full carrier?
- A. A3E
- B. A3J
- C. F3
- D. R3A
30. ECE Board Exam April 1998
What is the basic qualification of an applicant for public carrier network before a certificate of public convenience or a provisional authority is issued?
- A. Franchise
- B. SEC document
- C. Business permit
- D. Radio station license
31. ECE Board Exam April 1998
How wide is the spectrum bandwidth of a single GSM carrier?
- A. 100 kHz
- B. 200 kHz
- C. 50 kHz
- D. 16 kHz
32. ECE Board Exam April 1998
With which emission type is the capture-effect most pronounced?
- A. CW
- B. FM
- C. SSB
- D. AM
33. ECE Board Exam April 1998
What is a dummy antenna?
- A. One which is used as a reference for gain measurements
- B. And antenna used for hand-held radio
- C. An non-directional transmitting antenna
- D. A non-radiating load for a transmitter used for testing
34. ECE Board Exam April 1998
Best description of a collinear and broadside antenna radiation pattern.
- A. Bidirectional
- B. Perfect circle
- C. Unidirectional
- D. Omnidirectional
35. ECE Board Exam April 1998
A satellite beam that covers almost 42.4% of earths surface.
- A. Spot beam
- B. Global beam
- C. Zone beam
- D. Hemispheric beam
36. ECE Board Exam April 1998
The modulation technique used by GSM cellular system
- A. Phase shift keying
- B. Frequency shift keying
- C. Gaussian minimum shift keying
- D. QAM
37. ECE Board Exam April 1998
________ generates light beam at a specific visible frequency.
- A. Glass fiber
- B. Infrared
- C. Light waves
- D. Laser
38. ECE Board Exam April 1998
The most common application of satellites
- A. Surveillance
- B. Reconnaissance
- C. Defense systems
- D. Communication
39. ECE Board Exam April 1998
Referred to the dielectric constant of a transmission line material.
- A. Inductance and capacitance
- B. Velocity factor
- C. Characteristic impedance
- D. Propagation velocity
40. ECE Board Exam April 1998
Referred to as a ferrite device that can be used in lieu of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna.
- A. Isolator
- B. Circulator
- C. Coupler
- D. Diode.
41. ECE Board Exam April 1998
_______ is more prevalent in analog signals that have steep slopes or whose amplitudes vary rapidly.
- A. Peak limiting
- B. Quantization noise
- C. Granular noise
- D. Slope overload
42. ECE Board Exam April 1998
Station located on an object which is beyond and is intended to go beyond the major portion of the earth’s atmosphere.
- A. Terrestrial station
- B. Space station
- C. Satellite station
- D. Mobile satellite station
43. ECE Board Exam April 1998
A radio frequency in the ultra high frequency band of the radio spectrum band.
- A. 235.50 MHz
- B. 450.50 MHz
- C. 150.50 GHz
- D. 0.31250 GHz
44. ECE Board Exam April 1998
Technical study which deals with production, transport and delivery of a quality signal from source to destination.
- A. Transmission system engineering
- B. Communication system engineering
- C. Telephony engineering
- D. Telegraphic engineering
45. ECE Board Exam April 1998
It is used to connect computers in the same building or in same area
- A. MAN
- B. LAN
- C. SWITCH
- D. WAN
46. ECE Board Exam April 1998
Referred by radio regulation as the station in the mobile service not intended to be used while in motion.
- A. Fixed station
- B. Base station
- C. Land station
- D. Coast station
47. ECE Board Exam April 1998
What is the mixing process?
- A. Distortion caused by auroral propagation
- B. The combination of two signals to produce sum and difference frequencies.
- C. The elimination of noise in wideband receiver by phase differentiation
- D. The elimination of noise in a wideband receiver by phase comparison
48. ECE Board Exam April 1998
Which of the following systems is not used in radio detection and ranging?
- A. Frequency shift
- B. Frequency modulation
- C. Pulse radar
- D. Amplitude modulation
49. ECE Board Exam April 1998
Considered as the main source of an internal noise.
- A. Device imperfection
- B. Thermal agitation
- C. Temperature change
- D. Flicker
50. ECE Board Exam April 1998
In shipboard satellite dish antennas system, azimuth is referred as the _______.
- A. 0 to 90 degrees
- B. Vertical aiming of the antenna
- C. North to East
- D. Horizontal aiming of the antenna
51. ECE Board Exam April 1998
What is the period of a wave?
- A. The number of degrees in tone cycle
- B. The number of zero crossing in one cycle
- C. The amplitude of the wave
- D. The time required to complete one cycle
52. ECE Board Exam April 1998
Is the total useful information processed or communicated over a specific amount of time
- A. Baud rate
- B. Bit rate
- C. Information theory
- D. Throughput
53. ECE Board Exam April 1998
What is the approximate percentage of earth coverage of a geostationary satellite at zero degree elevation?
- A. 33.3%
- B. 45.2%
- C. 42.5%
- D. 30.5%
54. ECE Board Exam April 1998
This refers to an area in the memory used for temporary storage of information on the basis of “Last in First out”.
- A. Core
- B. Register
- C. Flag
- D. Stack
55. ECE Board Exam April 1998
What is a driven element of an antenna?
- A. Always the rearmost element
- B. Always the forward most element
- C. The element fed by the transmission line
- D. The element connected to the rotator
56. ECE Board Exam April 1998
Which of the following term best described the overload distortion?
- A. Peak limiting
- B. Quantization noise
- C. Granular noise
- D. Slope distortion
57. ECE Board Exam April 1998
What do you mean by the outward flow of and energy from any source in the form of radio waves?
- A. Radiation
- B. Emission
- C. Encoding
- D. Tracking
58. ECE Board Exam April 1998
Refer to the deviation of the operating frequency of a crystal oscillator from its nominal value due to temperature variations.
- A. Drift
- B. Flash over
- C. Frequency deviation
- D. Deviation ratio
59. ECE Board Exam April 1998
Find the product of the following binary number 100 to 101.
- A. 11000
- B. 10100
- C. 10010
- D. 11100
60. ECE Board Exam April 1998
Which of the following is and impedance matching ration of coax balun?
- A. 2:8
- B. 1:2
- C. 4:1
- D. 2:1
61. ECE Board Exam April 1998
Quantity that do not change when a beam of light enters on e medium to another.
- A. Frequency
- B. Wavelength
- C. Direction
- D. Speed
62. ECE Board Exam April 1998
Which of the following described the very early standard that defines binary digits as space/mark line condition and voltage levels?
- A. V.4
- B. V.2
- C. V.1
- D. V.5
63. ECE Board Exam April 1998
A form of single sideband emission where the degree of carrier suppression enable the carrier to be reconstituted and be used for demodulation.
- A. Half carrier single sideband emission
- B. Full carrier single sideband emission
- C. Reduced carrier single sideband emission
- D. Double sideband emission
64. ECE Board Exam April 1998
An instrument for recording waveforms of audio frequency.
- A. Oscilloscope
- B. Phonoscope
- C. Radioscope
- D. Audioscope
65. ECE Board Exam April 1998
How much is the required minimum power output of an international AM BC stations?
- A. 5 kW
- B. 30 kW
- C. 10 kW
- D. 50 kW
66. ECE Board Exam April 1998
What is the equivalent of decimal 51 in binary?
- A. 111011
- B. 110011
- C. 111001
- D. 100011
67. ECE Board Exam April 1998
One of the first satellite system catering personal based communications services scheduled for operation.
- A. Iridium system
- B. Plutonium system
- C. Indium system
- D. Gallium system
68. ECE Board Exam April 1998
What do you call a circuit that controls the magnetron output?
- A. Inverter
- B. Impeller
- C. Modulator
- D. Converter
69. ECE Board Exam April 1998
Known as the satellite transmitted signal form a satellite transponder to earth’s station.
- A. Uplink
- B. Down link
- C. RHCP
- D. Vertically polarized
70. ECE Board Exam April 1998
Which of the following colors of light rays has the shortest wavelength?
- A. Yellow
- B. Violet
- C. Red
- D. Blue
71. ECE Board Exam April 1998
Antenna which is not properly terminated
- A. Isotropic
- B. Non-resonant
- C. Whip
- D. Resonant
72. ECE Board Exam April 1998
Term in communication which is referred, “to send out in all direction”.
- A. Announce
- B. Broadcast
- C. Transmit
- D. Media
73. ECE Board Exam April 1998
At the ends of a half-wave antenna, what values of current and voltage exist compared to the remainder of the antenna?
- A. Minimum voltage and minimum current
- B. Equal voltage and current
- C. Minimum voltage and maximum current
- D. Maximum voltage and minimum current.
74. ECE Board Exam April 1998
One of the following stands for SONET acronym in telecommunication
- A. System optical network
- B. Simple operation network
- C. Synchronous optical network
- D. System operating network
75. ECE Board Exam April 1998
How can intermodulation interference between two transmitters in close proximity reduced or eliminated?
- A. Through installing a band-pass filter in the antenna feed line
- B. Through installing terminated circulator or ferrite isolator in the feed line of the transmitter and duplexer
- C. By using a class C final amplifier with high driving power
- D. By installing a low-pass filter in the antenna feed line
76. ECE Board Exam April 1998
What propagation condition is usually indicated when a VHF signal is received from a station over 5000 miles away?
- A. Moonbounce
- B. D-layer absorption
- C. Tropospheric ducting
- D. Faraday rotation
77. ECE Board Exam April 1998
In radio High frequency communications the higher the radio frequency the ______.
- A. Higher it can reach
- B. Shorter it can reach
- C. Effect is null
- D. Longer it can reach
78. ECE Board Exam April 1998
The signal to noise ratio that is required for a satisfactory television reception.
- A. 30 dB
- B. 40 dB
- C. 10 dB
- D. 20 dB
79. ECE Board Exam April 1998
What is meant by referring to electromagnetic waves as horizontally polarized?
- A. The electric field is parallel to the earth
- B. Both the electric and magnetic fields are vertical
- C. Both the electric and magnetic fields are horizontal
- D. The magnetic fields is parallel to the earth
80. ECE Board Exam April 1998
What is emission F3F?
- A. Facsimile
- B. Modulated CW
- C. RTTY
- D. Television
81. ECE Board Exam April 1998
How can receiver desensitizing be reduced?
- A. Increase the receiver bandwidth
- B. Ensure good RF shielding between the transmitter and receiver
- C. Increase the transmitter audio gain
- D. Decrease the receiver squelch, gain.
82. ECE Board Exam April 1998
Circuit used to amplify the optical signal in fiber optics communications links.
- A. Attenuator
- B. Optical repeater
- C. Optical amplifier
- D. Generator
83. ECE Board Exam April 1998
What do you call the single booster installed on the antenna dish of satellite receiver?
- A. Low noise amplifier
- B. Single amplifier
- C. Noise amplifier
- D. Rectifier
84. ECE Board Exam April 1998
Term for the transmission of printed pictures by radio?
- A. Facsimile
- B. ACSSB
- C. Xerography
- D. Television
85. ECE Board Exam April 1998
An interfering current in a telegraph or signaling channel due to telegraph or signaling current by another channel.
- A. Crosstalk
- B. Noise current
- C. Crossfire
- D. Intermodulation
86. ECE Board Exam April 1998
Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150 MHz) marine-band receiver?
- A. In the ionosphere
- B. In the receiver rear end
- C. In the receiver front end
- D. In the atmosphere
87. ECE Board Exam April 1998
Known as the data transfer scheme that used handmaking principle.
- A. Synchronous data transfer scheme
- B. DMA data transfer scheme
- C. Asynchronous data transfer scheme
- D. Uninterrupted data transfer scheme
88. ECE Board Exam April 1998
Type of modulation used in TV broadcast visual transmitter.
- A. Pulse modulation
- B. DSBFC
- C. Vestigial sideband
- D. SSBFC
89. ECE Board Exam April 1998
A transmitter supplies 8 kW to the antenna when it is unmodulated, determine the total radiated power when modulated at 30%.
- A. 5 kW
- B. 20 kW
- C. 15 kW
- D. 8.36 kW
90. ECE Board Exam April 1998
Best describe as an amplifier used in radio telephony.
- A. Magnifier
- B. Class B
- C. Class C
- D. Class A
91. ECE Board Exam April 1998
The latest government regulation in the telecommunication which provides policy for the provision of local exchange carrier service.
- A. E.O. 546
- B. E.O. 109
- C. Act 3948
- D. E.O. 59
92. ECE Board Exam April 1998
Referred to as the stage in the radio receiver that contributes most of the noise.
- A. IF amplifier
- B. Supply stage
- C. Speaker
- D. Mixer
93. ECE Board Exam April 1998
The frequency tolerance of an AM radio broadcast station
- A. 200 Hz
- B. 2000 Hz
- C. 20 Hz
- D. 2 Hz
94. ECE Board Exam April 1998
What are electromagnetic waves?
- A. A wave consisting of two magnetic fields at right angles to each other
- B. A wave consisting of an electric field and a magnetic field at right angles to each other.
- C. Alternating currents in the core of an electromagnet
- D. A wave consisting of two electric fields at right angles to each other
95. ECE Board Exam April 1998
What is the frequency range of C-band?
- A. 10.95 to 14.5 GHz
- B. 27.5 to 31 GHz
- C. 3.4 to 6.424 GHz
- D. 1.53 to 2.7 GHz
96. ECE Board Exam April 1998
Determine from the following the basic mode of transmission system in the public data network in which data are transferred from the source to the network and from the network to the destination in the frame format.
- A. Voice mode
- B. Asynchronous mode
- C. Synchronous mode
- D. Packet mode
97. ECE Board Exam April 1998
Refers to a type of beam antenna which uses two or more straight elements arranged in line with each other.
- A. Dipole antenna
- B. Yagi antenna
- C. Whip antenna
- D. Rhombic antenna
98. ECE Board Exam April 1998
What is a frequency discriminator?
- A. A circuit for filtering two closely adjacent signals
- B. A circuit for detecting FM signals
- C. An FM generator
- D. An automatic bandswitching circuit.
99. ECE Board Exam April 1998
These are used to connect non-ISDN equipment of ISDN line.
- A. Digipeaters
- B. Terminal adapters
- C. Local repeaters
- D. Terminal repeaters
100. ECE Board Exam April 1998
The executive branch of government in charge of policy making in the telecommunications.
- A. National telecommunications commission
- B. Telecommunications control bureau
- C. Department of transportation and communications
- D. Bureau of telecommunications
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