(Last Updated On: December 8, 2017)
This is the Section 4 Module 1 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 4 Module 1
95% |
PIN diode is important in detecting light in fiber optic system. Silicon PIN diode exhibits maximum quantum efficiency of______. |
0.10% |
GPS accuracy, Doppler frequency |
5% |
In order to maintain a loss less than 0.3 dB, the displacement of the fibers must be less than ____ |
0.2684 |
Eccentricity of tundra orbit |
30% |
CDMA system provides capacity of ____ greater than TDMA system |
30% |
DECT capacity _____ greater(?) than PHS |
95% |
Silicon PIN Diode … quantum efficiency of Erbium |
99.99% |
12 dB crest factor of a digital TV |
99.99% |
… _______ of the time |
3.3 |
In 16:9 HDTV, the optimal viewing distance is ____ times the picture height |
3.579545 |
Exact color subcarrier |
5 |
Home RF is ____ times greater than Bluetooth |
7 |
Number of categories of UTP cable. |
9.296 |
Morse Code |
12.355 |
Radar nautical miles in microseconds |
16 |
Number of ephemeris parameters |
127 |
Wireless USB (WUSB) can connect to how many interfaces? |
163 |
Number of countries that are members of ISO out of 203 countries |
191 |
Number of countries that are members of ITU |
802.14 |
IEEE standard for TV + data |
802.14 |
TV |
802.5 |
Token Ring |
1992 |
GSM900 |
1993 |
In what year did Bluetooth SIG complete Bluetooth Core Specification 4.0 |
1993 |
CIDR |
1994 |
GSM 1800 |
1996 |
GSM1900 |
10000 |
Number of bundles in flexible endoscopy (3 micron) |
21‐Apr‐10 |
Bluetooth V.4.0 |
11‐Jun‐10 |
Approval of MC 02‐06‐2010 |
65535 |
Unicode |
‐0.011 nm/°C |
Braggs gratings |
300 lb. |
Maximum tensile load for lashed aerial cable |
‐41.3 dBm/MHz |
Spectral density of Ultrawide band (UWB) |
‐41.3 dBm/MHz |
Spectral density of Ultrawide band (UWB) |
‐62°C |
Stratosphere |
>23 db across the channel |
|
0 degree latitude |
Position of geostationary satellite at equator |
‐0.011nm/°C |
Fiber bragg gradient |
0.1 dB |
Insertion loss of MEMS |
0.2 dB |
Average in‐channel insertion loss of DVB‐T |
0.275 ± 0.015 |
Numerical aperture of multimode |
0.5 dB/km |
Maximum attenuation that a fiber will still work |
0.5 dB/km |
Grit of less than ____ dB/km |
1 hop |
Fast hop if greater than ________ |
1.0 samples per second |
GPS and GLONASS data rate |
1.2 dB |
L to X |
1.6 Mbps |
Home RF data rate |
1.88 ‐ 1.90 GHz |
DECT |
1/10 λ |
Pair of conductors to be considered as transmission line |
1/2 of the original rate |
|
1/4 λ |
High voltage, minimum current, voltage is equal to zero at the center when ____ λ |
1/8 spacing |
|
1/m |
Unit of Bulk absorption coefficient |
10 ‐ 50 kW |
Permissible power in kW at night for Class B |
10 m |
Ultrawide band (UWB) operating at 3.1 to 10.6 GHz in 110 Mbps can operate at what distance? |
10 Mbps |
DOCSIS maximum data rate |
10 times |
802.11b range over Bluetooth |
10 times less |
How many repeater needed for coax to have the same performance fiber optic |
10^6 ‐ 10^8 |
Gain of effective radar receiver |
100 kb |
JPEG compression of 20:1 …. |
100 m |
Maximum distance of 10baseT |
100 m |
Maximum distance of 100baseT |
100 Mbps |
maximum data rate of CAT 5 UTP cable |
100 THz |
Past 10 years fiber optics is said to have what theoretical bandwidth |
1000baseT |
Which Gigabit Ethernet can support data rate up to 1000 Mbps? |
100‐200 kHz |
Low frequency Loran is modified as standard Loran operating at _______ kHz |
100baseT |
Generic name for Fast Ethernet standard |
10‐15 MHz |
Intermediate RFID |
10‐300 µm |
Successive approximation |
105 x 74 mm |
ID 2, German ID cards issued prior to the November 2010 |
10base5 |
10Mbps |
1100‐1280 nm |
Cut‐off wavelength of single mode glass optical fiber |
1150‐1350 nm |
Wavelength with minimum loss |
1200 bps |
Caller ID can sending rate |
1209Hz, 1336Hz, 1477Hz, 1633Hz |
In DTMF, the horizontal frequencies are ______. |
125 ± 3 µm |
Multimode glass optical fiber cladding diameter |
125 µm |
Cladding diameter of step index |
13.56 GHz |
Type A and Type B proximity cards |
14 GHz |
Common uplink frequency of Ku Band |
15 kV |
Dangerous when voltage increases beyond this value (X‐ray) |
150 km |
In fiber transmission, using a… source the speed is 1Gbps with the distance of 15 km to ____. |
150 m^3/min |
…. Peak power of 10kw |
155 Mbps |
PoS supports minimum data rate of _______ |
1575.42‐1227.6 MHz |
Center frequency of NAVSTAR GPS |
1600 GHz |
Bandwidth of fiber optic nowadays |
1602.15‐1615.5 MHz |
Center frequency of GLONASS |
18 m |
Diameter of horn‐driven paraboloid |
1895‐1918 MHz |
DECT |
19kHz |
Carrier of stereophonic signal |
2 to 3 |
CDMA can increase capacity up to _________ by sectorization |
Complete List of Communications Engineering Coaching Materials
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