This is the Section 5 Module 15 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 15
# |
Questions |
Answers |
1 |
One synch bit for every after 7bits |
invert-on-zero |
2 |
Bluetooth |
802.15 |
3 |
Bluetooth throughput |
723 kbps |
4 |
Bluetooth uses what multiple access |
spread spectrum |
5 |
SPADE uses |
QPSK |
6 |
Fast Ethernet 10 Mbps uses |
Manchester Coding |
7 |
Not 3G |
TD/CDMA |
8 |
3G October 2000 |
CDMA2000 1X |
9 |
IPS Radio and Satellite System Australia |
T index |
10 |
Try to send at baseband network cable |
contention |
11 |
Sending at baseband network cable |
collision |
12 |
Satellite 10-100 kg |
Microsat |
13 |
Spacecraft problem |
Satellite Anomaly |
14 |
Satellite actual user information |
Satellite Payload |
15 |
Commonly used has lesser number of bit than not commonly used |
Huffman Code |
16 |
AM uses |
nonlinear devices |
17 |
ITU designation J |
SSBSC(Single Sideband Suppressed Carrier) |
18 |
WIFI with broadband data rate |
EDGE |
19 |
Broadband data rate |
2 Mbps |
20 |
Telephone current |
20 – 80 mA |
21 |
Telephone ring |
90 V, 20 kHz |
22 |
WIFI |
802.11b |
23 |
2 or more antennas at same frequency |
Space diversity |
24 |
Type of diversity same as space diversity with two antennas |
Polarization |
25 |
Backup for 11 or more |
Diversity Protection |
26 |
Designated backup for each |
Hot-Standby Protection |
27 |
SRRS planning |
12.5 kHz |
28 |
Terrestrial Digital TV |
32.28 Mbps |
29 |
DVD laser diodes wavelength |
650 nm |
30 |
Prime meridian |
ITU |
31 |
Highly elliptical orbit |
Molniya of Russia |
32 |
Vertical and horizontally polarized but unequal magnitudes |
elliptical |
33 |
T1 interleaving method |
Word Interleaving |
34 |
E1 uses frame alignment bit rate |
28 kbps |
35 |
Capture range for 0 deg. Elevation |
42.5 % |
36 |
Facsimile |
Photodetector |
37 |
Fiber optic light source with narrow emission |
ILD (Injection Laser Diodes) |
38 |
Naturalness |
80 – 8000 Hz |
39 |
Monoaural |
160 – 8000 Hz |
40 |
Useful information capacity |
throughput |
41 |
Binary 6 zero coding |
T2 |
42 |
First Philippine Satellite launched |
Aug. 19, 1997 |
43 |
MP2 to HDTV ratio |
55 to 1 |
44 |
Microwave repeater angle should be set to |
small |
45 |
Using fundamentals of light |
Photonics |
46 |
Plastic cladding, glass core |
PCS |
47 |
Measuring of band of sound pressure level |
All of the above |
48 |
Advantages of SSB AM to AM |
All of the above |
49 |
The relation of index of refraction of core and clad |
index of refraction of core is greater than clad |
50 |
Sideband power comes from |
modulating amplifier |
51 |
Class of FM with antenna 500 in height |
Class B |
52 |
Mobile phones with GPRS and GSM functions but manually interchanged |
Class C |
53 |
Natural Sampling do not use |
Sample and Hold Circuit |
54 |
Spectral splitting due to strong magnetic fields |
Zeeman Effect |
55 |
Waveguide, superposition of two planar waves |
mode |
56 |
Provides ITU all over the world |
GPS |
57 |
3GSM |
3GPP |
58 |
Voice frequency transmission disadvantage |
Interference |
59 |
QAM disadvantage |
incompatibility with receivers |
60 |
Bad frames are detected by |
link layer |
61 |
Parallel resonant LC circuit |
Input impedance |
62 |
Downtime / (downtime + uptime) |
unavailability parameter |
63 |
CSMA / CD |
to detect collisions |
64 |
Most important Parameter of uWave Systems |
C/N |
65 |
Reflective upper atmosphere |
Heaviside-Kennelly |
66 |
Square of period is proportional to cube of distance |
harmonic law |
67 |
AM double sideband designation |
A |
68 |
High velocity of rotating video heads |
to increase write speed |
69 |
Image frequency |
frequency is added below and above the local oscillator which is equal to intermediate frequency |
70 |
Padders on receivers |
to improve tracking |
71 |
Flicker noise |
greater at low frequency |
72 |
Granular noise happens |
when the signal does not change |
73 |
Base station/Cell site to mobile unit |
forward link |
74 |
Test for intelligibility |
Articulation test |
75 |
Percent of correct syllables |
articulation efficiency |
76 |
Percentage to be considered in articulation test to be 100 % intelligent |
80 % |
77 |
Analog mobile comm. Fastest data rate |
AMPS |
78 |
Square wave harmonics |
odd |
79 |
8PSK has degrees separation |
45 degrees |
80 |
Hard-to-get stations |
Dxing |
81 |
100% modulation, RF amp voltage |
4 times voltage |
82 |
Sound is 0.5 of power compared to picture |
to minimize interference |
83 |
VLF antenna is impractical |
miles in length |
84 |
Mysterious radio wave propagation that occurs in the equator at minimum sunspot |
transequatorial |
85 |
FM modulation index |
increases with phase deviation, decreases with modulation frequency |
86 |
EHF |
millimetric waves |
87 |
Antenna parameters interchangeable between antenna and receiver |
reciprocity principle |
88 |
Back porch |
5.9 microseconds |
89 |
Measuring absorption coefficient |
impedance tube matching |
90 |
Space diversity domain |
vertical domain |
91 |
Deriving FM from PM |
integrate the PM wave before modulation |
92 |
Considered as loss in transmission systems |
fade margin |
93 |
The difference between driver and terminator |
noise margin |
94 |
Depends on the direction of magnetic field not on its magnitude |
Alfven wave |
95 |
Near region |
one wavelength |
96 |
Superframes consist of how many frames |
12 |
97 |
Magnetic field intensity at equator |
32,000nT |
98 |
Category of isdn digital service which is additional services |
Supplementary |
99 |
Transmission planning which is approaching to a zero transmission loss |
via net pulse |
100 |
Pulse “Blanked” out and is invisible in the receiver |
blanking pulse |
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