(Last Updated On: December 8, 2017)
This is the Section 5 Module 10 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 10
# |
Questions |
Answers |
1 |
new name of CCITT |
ITU-T |
2 |
Impedance matching ratio of a coax balun |
4:1 |
3 |
load matching over a range of frequencies |
double stub |
4 |
T1 for TDM system |
24 |
5 |
the final amplifier of either FM or AM transmitter operates as class ____ |
C |
6 |
8 bits |
|
7 |
where maximum current and minimum voltage values on a resonant Hertz dipole exist |
center of the antenna |
8 |
circuit that is turned on |
request to send |
9 |
emission designation for facsimile |
A3E and F3C |
10 |
In satellite communication, the geostationary satellites are conveniently located with respect to the equator at ______ |
0 degrees latitude |
11 |
refers to a double sideband full carrier |
A3E |
12 |
the voltage node of a half-wave antenna exists |
at feed point |
13 |
the modulation technique used by GSM cellular system |
Gaussian Minimum Shift Keying |
14 |
ferrite device that can be used in line of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna |
Circulator |
15 |
in shipboard satellite dish antennas system, azimuth is referred as the _____ |
horizontal aiming of the antenna |
16 |
the total useful information processed or communicated over a specific amount of time |
throughput |
17 |
approximate percentage of earth coverage of a geostationary satellite at zero degree elevation |
42.5% |
18 |
very early standard that defines binary digits as space/mark line conditions and voltage levels |
V.1 |
19 |
required minimum power output of an international AM BC stations |
50 kW |
20 |
one of the first satellite system catering personal based communications services scheduled for operation |
Iridium system |
21 |
propagation condition is usually indicated when a VHF signal is received from a station over 5000 miles away |
tropospheric ducting |
22 |
signal to noise ratio that is required for a satisfactory television reception |
40dB |
23 |
emission F3F |
television |
24 |
single booster installed on the antenna dish of satellite receiver |
low noise amplifier |
25 |
noise generated that primarily determines the signal-to-noise ratio in a VHF (150MHz) marine-band receiver |
in the receiver front end |
26 |
latest government regulation in the telecommunication which provides policy for the provision of local exchange carrier service |
E.O. 109 |
27 |
frequency tolerance of an AM radio broadcast station |
20 Hz |
28 |
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 |
Packet Mode |
29 |
type of beam antenna which uses two or more straight elements arranged in line with each other |
Yagi Antenna |
30 |
used to connect non-ISDN equipment to ISDN line |
Terminal Adapters |
31 |
executive branch of government in charge of policy making in the telecommunications |
Department of Transportation and Communications |
32 |
forward link channel |
pilot channel |
33 |
phase reversal keying |
binary phase |
34 |
each point on a spherical wavefront may be considered a source of secondary spherical wavefronts |
Huygen’s Principle |
35 |
term used to describe a spread spectrum communications system where the center frequency of a conventional carrier is altered many times per second in accordance with a pseudo-random list of channels |
Frequency hopping |
36 |
frequency bands can be refracted during the day by the D layer |
both VLF and LF |
37 |
considered the most frequently used transmission line |
flexible coaxial line |
38 |
height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence |
virtual height |
39 |
optimum volume per person of rooms for speech |
2.8 |
40 |
optimum reverberation time at 500 Hz for a cinema |
0.8 to 1.2 sec |
41 |
establishes the receiver bandwidth |
IF amplifier |
42 |
Flicker noise is a poorly understood form of noise which may be completely ignored about above ____ |
500 Hz |
43 |
typical gain of a rhombic antenna |
between 15 to 60 |
44 |
voice band channels in a superjumbogroup |
10,800 |
45 |
illumination factor is normally considered in computing parabolic antenna gain in microwave communications |
0.54 |
46 |
in acoustics, reference pressure in lb/ft2 unit |
2.089 |
47 |
organization that published safety guidelines for the maximum limits of RF energy near the human body |
American National Standards Institute (ANSI) |
48 |
measuring a transmitter’s frequency against a suitable standard, the frequency to be |
final RF stage |
measured is taken from the |
||
49 |
ionosphere most ionized |
midday |
50 |
cellular radios use FM with a maximum deviation of ± ______ |
12 kHz |
51 |
device that measures the angle between two radio frequencies and also the direction of propagation of a wave |
goniometer |
52 |
an automated ship-to-shore distress alerting system using satellites and advanced terrestrial communications systems |
GMDSS |
53 |
device that measures RF power by measuring the heat the rf power generates |
Calorimeter |
54 |
considered the most efficient mode in terms of energy transfer in waveguides |
Dominant Mode |
55 |
In acoustics, ______ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener |
Doppler Effect |
56 |
oxygen molecule absorption peaks to electromagnetic wave are at what wavelengths |
5 mm and 2.5 mm |
57 |
in cellular system, the _____ defines the geographic distance that is required between cells using identical frequencies in order to avoid interference between the radio transmissions at these cells |
distance-to-reuse ratio (D/R) |
58 |
the ability of a mobile phone to change from one channel (frequency) to another |
Frequency agility |
59 |
in cellular system, the average lead time to install a new base station is approximately ____ months to a year |
6 |
60 |
at one atmospheric pressure, what is the approximate speed of sound in steel |
5150 m/s |
61 |
noise observable up to 8 MHz |
space noise |
62 |
in the American standard, the aural transmitter maximum radiated power is ____ of peak visual transmitter power |
20 % |
63 |
end impedance of half-wave dipole |
2500 Ω |
64 |
standardized as part of GSM phase 2+ that can offer theoretical data speeds up to 115 kbit/s |
GPRS |
65 |
channel number of an FM station with a carrier frequency of 99.5 MHz |
258 |
66 |
comparing the capacities of a DVD and an ordinary CD, DVD is ____ times bigger than CD |
15 |
67 |
waveguide passive component that brings a smooth change in the direction of axis maintained perpendicular to the plane of polarization |
h bend |
68 |
a low frequency audible periodic variation in pitch of sound output in high fidelity sound reproduction system |
Wow |
69 |
_____ is a term in the test language for noise testing in telephone circuits that means a one-syllable word consisting of a consonant, a vowel, and another consonant |
Logatom |
70 |
why are frequency modulation transmitters more efficient |
Because their power is increased by class C amplifiers |
71 |
not an ITU sector |
ITU-W |
72 |
a component that samples the microwave signal traveling in one direction down to the transmission line |
Directional coupler |
73 |
signal-to-noise ratio is required for satisfactory television reception |
40 dB |
74 |
telephone channels in AT 2 line |
96 |
75 |
maximum power that can be obtained from a microwave tube at 10 GHz |
10 W |
76 |
circuit detects frequency modulated signal |
Discriminator |
77 |
form of regenerative repeater for transmitting signals over a long cable received through a relay in a clearer form |
Interpolator |
78 |
particular wavelength is solar flux measured |
10.7 cm band |
79 |
enhancement of GSM including the GPRS |
2.5G |
80 |
In television, sync-pulse is ____ IRE |
40 |
81 |
base-to-mobile frequency assignment of a GSM system |
935-960 MHz |
82 |
bits of PREAMBLE in Ethernet frame |
56 |
83 |
frequency used in communicating for submerged submarines |
100 Hz |
84 |
frequency range of radio altimeter |
4240 to 4350 MHz |
85 |
used for high definition video and data storage |
blu-ray |
86 |
fiber number of multi-core fiber colored white and black |
18 |
87 |
camera tubes uses lead oxide (PbO) for the photoconductive target plate |
plumbicon |
88 |
in accordance with the ITU specifications, the cutoff wavelength of a single-mode fiber is from ____ to _____ |
1100,1280 |
89 |
RS232C uses ____ circuits for protocol handshaking |
9 |
90 |
standard adopted by the grand alliance in digital broadcasting for multi-channel audio source encoding in America |
Dolby standard AC-3 |
91 |
the cable type used in CCTV that has a maximum run-length of 250 meters |
URM-70 |
92 |
lossy real impedance |
resistance |
93 |
typical diameter of an external diameter direct burial fiber cable |
14.8 mm |
94 |
latitude of international space station |
350 km |
95 |
bluetooth |
piconet |
96 |
shotckky??? diode or ____ diode |
hot carrier |
97 |
decimetric wave |
space wave |
98 |
cryptographic |
cryptomeria ciper |
99 |
commercial load for TV |
18 mins per hour |
100 |
in a single sideband suppressed carrier, what is the maximum instantaneous peak power if PEP is 50 W |
10 W |
101 |
cleaving is a process of _____ connecting two fibers |
cutting an end fiber in preparation to |
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