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# Communications Engineering Mastery Test 5: ECE Pre-Board

This is 100 items set of Practice Examination 5 in Communications Engineering (Electronics Systems and Technology) composed of previous Board Exams Questions. Read each question and choice 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 question to increase the chance of passing the ECE Board Examination.

#### Start the Test Yourself Exam 5

Choose the letter of the best answer in each question.

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

Solution:

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 ratio

C. Antenna total ratio

D. Antenna efficiency

Solution:

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

Solution:

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

Solution:

5. ECE Board Exam April 1998

A band where most military satellites often operate

A. Ku

B. C

C. X

D. L

Solution:

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

Solution:

7. ECE Board Exam April 1998

In television broadcasting vivid strong colors are often referred to as _______.

A. Saturation

B. Hue

C. Chrominance

D. Luminance

Solution:

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

Solution:

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

Solution:

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

Solution:

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%

Solution:

12. ECE Board Exam April 1998

A. Aural BC intercity relay

C. Shortwave station

D. Remote-pickup

Solution:

13. ECE Board Exam April 1998

What law does a light traveling in air optical fiber follow?

A. Millman

B. Snellโs

C. Maxwell

D. Huygen

Solution:

14. ECE Board Exam April 1998

Which of the following is designated as the international distress, safety and calling frequency for radiotelephony 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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

C. Reflector

Solution:

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 lines drawn through the ends of the elements

Solution:

23. ECE Board Exam April 1998

A multiple access technique used in GSM cellular system

A. TACS

B. FDMA

C. TDMA

D. CDMA

Solution:

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.

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

29. ECE Board Exam April 1998

Which of the following refers to a double sideband full carrier?

A. A3E

B. A3J

C. F3

D. R3A

Solution:

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

Solution:

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

Solution:

32. ECE Board Exam April 1998

With which emission type is the capture-effect most pronounced?

A. CW

B. FM

C. SSB

D. AM

Solution:

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. A non-directional transmitting antenna

Solution:

34. ECE Board Exam April 1998

A. Bidirectional

B. Perfect circle

C. Unidirectional

D. Omnidirectional

Solution:

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

Solution:

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

Solution:

37. ECE Board Exam April 1998

________ generates light beam at a specific visible frequency.

A. Glass fiber

B. Infrared

C. Light waves

D. Laser

Solution:

38. ECE Board Exam April 1998

The most common application of satellites

A. Surveillance

B. Reconnaissance

C. Defense systems

D. Communication

Solution:

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

Solution:

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.

Solution:

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

Solution:

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 earthโs atmosphere.

A. Terrestrial station

B. Space station

C. Satellite station

D. Mobile satellite station

Solution:

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

Solution:

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

Solution:

45. ECE Board Exam April 1998

It is used to connect computers in the same building or in the same area

A. MAN

B. LAN

C. SWITCH

D. WAN

Solution:

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

Solution:

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

Solution:

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

D. Amplitude modulation

Solution:

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

Solution:

50. ECE Board Exam April 1998

In shipboard satellite dish antennas system, azimuth is referred to as the _______.

A. 0 to 90 degrees

B. Vertical aiming of the antenna

C. North to East

D. Horizontal aiming of the antenna

Solution:

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

Solution:

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

Solution:

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%

Solution:

54. ECE Board Exam April 1998

This refers to an area in the memory used for temporary storage of information on the basis of โLast in First outโ.

A. Core

B. Register

C. Flag

D. Stack

Solution:

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

Solution:

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

Solution:

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?

B. Emission

C. Encoding

D. Tracking

Solution:

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

Solution:

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

Solution:

60. ECE Board Exam April 1998

Which of the following is and impedance matching ratio of coax balun?

A. 2:8

B. 1:2

C. 4:1

D. 2:1

Solution:

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

Solution:

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

Solution:

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

Solution:

64. ECE Board Exam April 1998

An instrument for recording waveforms of audio frequency.

A. Oscilloscope

B. Phonoscope

D. Audioscope

Solution:

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

Solution:

66. ECE Board Exam April 1998

What is the equivalent of decimal 51 in binary?

A. 111011

B. 110011

C. 111001

D. 100011

Solution:

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

Solution:

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

Solution:

69. ECE Board Exam April 1998

Known as the satellite transmitted signal from a satellite transponder to earthโs station.

C. RHCP

D. Vertically polarized

Solution:

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

Solution:

71. ECE Board Exam April 1998

Antenna which is not properly terminated

A. Isotropic

B. Non-resonant

C. Whip

D. Resonant

Solution:

72. ECE Board Exam April 1998

Term in communication which is referred, โto send out in all directionโ.

A. Announce

C. Transmit

D. Media

Solution:

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.

Solution:

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

Solution:

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

Solution:

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

Solution:

77. ECE Board Exam April 1998

A. Higher it can reach

B. Shorter it can reach

C. Effect is null

D. Longer it can reach

Solution:

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

Solution:

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

Solution:

80. ECE Board Exam April 1998

What is emission F3F?

A. Facsimile

B. Modulated CW

C. RTTY

D. Television

Solution:

81. ECE Board Exam April 1998

How can receiver desensitizing be reduced?

B. Ensure good RF shielding between the transmitter and receiver

C. Increase the transmitter audio gain

D. Decrease the receiver squelch, gain.

Solution:

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

Solution:

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

Solution:

84. ECE Board Exam April 1998

Term for the transmission of printed pictures by radio?

A. Facsimile

B. ACSSB

C. Xerography

D. Television

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

90. ECE Board Exam April 1998

Best describe as an amplifier used in radiotelephony.

A. Magnifier

B. Class B

C. Class C

D. Class A

Solution:

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

Solution:

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

Solution:

93. ECE Board Exam April 1998

A. 200 Hz

B. 2000 Hz

C. 20 Hz

D. 2 Hz

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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.

Solution:

99. ECE Board Exam April 1998

These are used to connect non-ISDN equipment of ISDN line.

A. Digipeaters

C. Local repeaters

D. Terminal repeaters

Solution:

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

Solution:

### Complete List of Communications Engineering Exams: ECE Pre-Board

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