(Last Updated On: December 8, 2017)
This is the Section 5 Module 9 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 9
# |
Questions |
Answers |
1 |
current frequency band given most attention for Satellite Communications |
Ku |
2 |
X-rays |
30 to 0.3 Angstorms |
3 |
space diversity transmission means transmitting and receiving on ______ |
two or more antennas operating on the same frequency |
4 |
Ship-to-ship communications system is plagued by fading. Best solution seems to be the use of |
Frequency Diversity |
5 |
American concert pitch A is equivalent to |
440Hz |
6 |
International concert pitch A is equivalent to |
435Hz |
7 |
d band |
2.20 to 3.30 |
8 |
lowest layer of ionosphere |
D |
9 |
highest layer of the atmosphere |
Ionosphere |
10 |
don’t disappear at night |
F2 |
11 |
next lowest layer |
E |
12 |
highest layer |
F2 |
13 |
velocity factor of coaxial cable |
0.6 to 0.8 |
14 |
velocity factor of transmission lines |
0.5 to 0.9 |
15 |
government and military communication |
NITA |
16 |
related to mental processes of knowledge, reasoning, memory, judgment and perception |
Cognitive |
17 |
for navigation as well as marine and aeronautical communications and radar, ____ band is used |
L |
18 |
accepted official dimension of a mini-DV cassette package used in video recording in millimeters |
66x48x12.2 |
19 |
NTC memorandum circular governs the rules and regulations about the manufacture, acquisition, sale and service of radio communication equipment |
MC no. 02-05-88 |
20 |
a radio frequency in the UHF band of the radio spectrum |
0.31250 GHz |
21 |
when a space-wave signal passes over a mountain ridge, a small part of the signal is diffracted down the far side of the mountain |
knife-edge diffraction |
22 |
angle of inclination of GPS system |
55° |
23 |
bending of radius for fiber optic |
350 mm |
24 |
an analog video signal that carries the video data as two separate signals (brightness and color) is called |
S-Video |
25 |
a satellite beam that covers almost 42.4% of earth’s surface |
global beam |
26 |
V.42 |
link access protocol modem |
27 |
multiple access technique used in GSM cellular system |
TDMA |
28 |
Connector is popular in attaching test instruments like oscilloscopes, frequency counters, spectrum analyzers. |
BNC |
29 |
to increase the transmission distance of UHF signal |
increase antenna height |
30 |
medium used by IBM token ring network that operates at either 4 Mbps or 16 Mbps |
twisted pair |
31 |
loudness level in which permanent damage to hearing is possible |
150dB |
32 |
coaxial cable connector is at least expensive and is widely used for TV sets, VCRs and cable TV |
F-type connector |
33 |
attenuator which connects passive two-ports |
Calibration |
34 |
primary cause of ionization |
Ultraviolet Radiation |
35 |
increase in sound level commonly perceived by most people |
6 to 10 dB |
36 |
sound pressure level if RMS sound pressure is 100microbars |
114dB |
37 |
coaxial connector is a more complex and expensive but do a better job in maintaining the electrical characteristics of the cable through the interconnections |
N-type connector |
38 |
PCS(personal communication system) |
50 kHz |
39 |
cocktail-end |
binaural discrimination |
40 |
capture effect |
FM |
41 |
acoustic behavior of gases |
all of the choices (density, temperature, pressure) |
42 |
spectrum bandwidth of a single GSM carrier |
200kHz |
43 |
noise figure having lowest noise |
1.6dB |
44 |
transistor having lowest noise figure |
MESFET |
45 |
noise outside the solar system |
cosmic noise |
46 |
ECT can apply for registration without examination |
5years |
47 |
ionosphere propagate by |
space wave |
48 |
maximize the skip distance |
using the smallest possible radiation angle and highest possible frequency |
49 |
space diversity |
two or more antennas on the same wavelength |
50 |
frequencies in the UHF range propagate by means of |
space waves |
51 |
VLF waves are used for some types of services because |
they are very reliable |
52 |
greatest advantage of FM over AM |
FM amplitude is constant at all times |
53 |
Companding |
correlation |
54 |
PCS(personal communication system) |
45MHz |
55 |
sound characteristic relates to a sonic time pattern |
rhythm |
56 |
typical center frequency spacing between adjacent channels (transponders) in satellites |
40 MHz |
57 |
orbital period of GPS constellation |
12hrs |
58 |
radiowave that is far from its source |
plane wave |
59 |
electric field that lies in a plane parallel to the surface of the earth |
horizontal polarization |
60 |
reference tone level for dBa |
-85dBm |
61 |
midband channel A-1 |
108 to 114 MHz |
62 |
Huffman coding character contains bits |
from 4 to 11 |
63 |
modulation technique used in data communications that is a variant of QAM that includes a method for forward error correction |
trellis coding modulation |
64 |
series modulation |
system capable of generating high power |
65 |
cellular standard known as the cdmaOne |
IS-95 |
66 |
medium range |
the one supported by IEEE 802.11 recommendation |
67 |
most often used for outer covering of coaxial cables |
PVC |
68 |
Ethernet system is restricted only to 100m |
10baseT |
69 |
principal musical intervals is considered dissonant |
7:8 |
70 |
light traveling in air optical fiber follow |
snell |
71 |
shortest wavelength in colors of light rays |
blue |
72 |
each point on a spherical wavefront may be considered a source of secondary spherical wavefronts |
Huygen’s Principle |
73 |
high frequency sound that cannot be heard by the human ear |
ultrasonic |
74 |
apparent loudness level of 80dB |
very loud |
75 |
ionoshpere causes radio signals to be |
refracted |
76 |
amount of sound reduction provided by a barrier-wall,floor or ceiling |
transmission loss |
77 |
perceptible sound repetition |
echo |
78 |
dispersion is the term used to describe |
splitting of white light into its component colors in reflection |
79 |
velocity of sound in air at 0 degrees Celcius |
331.5m/s |
80 |
in electromagnetic waves, polarization means |
physical orientation of electric field in space |
81 |
typical temperature range for installing fiber optical cable |
-40 to 80 °C |
82 |
station located on an object which is beyond and is intended to go beyond the major portion of the earth’s atmosphere |
space station |
83 |
atmospheric noise becomes less severe at frequencies |
above 30MHz |
84 |
a device that measures the internal open circuit voltage |
psophometer |
85 |
if the transmitter power remains constant, an increase in the frequency of the sky wave will |
lengthen the skip distance |
86 |
a light ray enters one medium from another along the normal. The angle of refraction is |
dependent on the indexes of refraction |
87 |
two directional antennas are pointed so that their beams intersect in the troposphere |
troposcatter |
88 |
run-length encoding |
compress |
89 |
best viewing distance of TV screen is ____ times the picture height |
4 to 8 |
90 |
dielectric constant of polyethylene (PE) insulator |
2.27 |
91 |
typical loudness level of an acoustic guitar 1 foot away |
80 dB |
92 |
IS-95 |
9.6kbps |
93 |
satellite speed increases and its height in orbits gets ____ |
lower |
94 |
satellite subsystem monitors onboard conditions such as temperature and battery voltage and transmits this data back to a ground station for analysis |
TTC |
95 |
normally associated with specifying the location of celestial body in space |
ephemeris |
96 |
satellite subsystem provides stabilization in orbit and senses changes in orientation |
attitude control subsystem |
97 |
range of speech power |
10 to 1000 microwatts |
98 |
how does spatial isolation technique satellite communications avoid interference |
employment of highly directional spot-beam antennas |
99 |
polytetrafluoroethylene(PTFE) is also widely used insulator and is known as |
teflon |
100 |
in installing fiber cable, ____is a long-time use |
tighter bends |
101 |
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 |
156.8 MHz |
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