This is the Section 5 Module 16 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 16
# |
QUESTIONS |
ANSWERS |
1 |
A doctoral degree is equivalent to how many additional credit units upon the completion of the degree |
45 |
2 |
The band of frequencies allocated to cable television relay services by the NTC by |
12.17 to 13.20 Ghz |
3 |
Low-power proximity readers for RFID tags have effective radiated power not exceeding |
500mW |
4 |
Unauthorized servicing is any service rendered to alter the ___ number or code of any mobile phone unit |
IMEI |
5 |
As specified by the NTC, each Voip service resellers must post a performance bond in the amount of _____ to guarantee the delivery of VOIP service to the public |
Php 1,000,000 |
6 |
What section RA 7925 states that Value Added Services (vas) providers are exempted from securing from the Philippine legislature as long as they don’t set up their own network |
Section 11 |
7 |
Electronics game providers and developers must secure a certificate of registration from NTC, which is valid for a maximum period of |
5 years |
8 |
Minimum validity/expiration period of prepaid load php300.00 |
75days |
9 |
Optical media board has |
5 regular members |
10 |
“optical media act of 2003” |
RA 9239 |
11 |
For FM stations outside Metro Manila, what is the primetime block |
6:00 am to 8:00pm |
12 |
For radio station outside Metro Manila, program interrupted for the airing of commercials must not exceed ___ breaks in every program hour |
6 |
13 |
IEEE designation of iso-enet (isochronous Ethernet) |
IEEE 802.9A |
14 |
Fast token ring, also called as high speed token ring uses the standard token ring topology, protocols, and media access control but runs at ___ Mbps |
100 |
15 |
IEEE 802.3z |
Gigabit Ethernet |
16 |
In what year did ITU-T adopted v.42 recommendation for error detection modems |
1988 |
17 |
All modem standards has maximum symbol rate of 2400 except |
v.34 |
18 |
Refers to videoconferencing standards |
ITU H.26 |
19 |
Fourth symbol used in emission |
Details of signals |
20 |
Collegiate body that possesses through its member a thorough knowledge of radio communications and problem of their use |
IFRB |
21 |
Defined under international telecommunication convention, Nairobi, 1982, first part, chapter 1, article 2, no. 83 |
CCIR duties |
22 |
Collegiate body possesses through its members a thorough knowledge of radio communications and the problem of their use |
International frequency registration board |
23 |
CCITT formed in |
1956 |
24 |
CCITT study group number 17 |
Data transmission over the telephone network |
25 |
CCIR study group is responsible for broadcasting service – sound |
10 |
26 |
CCIR study group responsible for fixed satellite services |
Study group 4 |
27 |
CCITT structure has a numbers of study groups that provides the networks classification or specialization for developing the recommendations |
Study group 17 |
28 |
CCITT study group responsible for the definition and operational aspect of telegraph and user services |
Study group 1 |
29 |
CIRR study group dealing with particular aspect of radio communications |
Study group 11 |
30 |
Ds-1 signal consist of ____ channels in multiplexed |
24 |
31 |
Refers to software type that helps group of people to work together |
Groupware |
32 |
FDDI assumes a maximum of 1000 stations and a ___ kilometers path that requires a repeater every 2 kilometers |
120 |
33 |
Another name for IP switches can message based on their network layer address |
Layer 3switches |
34 |
___- can understand several different network layer protocols |
Multiprotocol router |
35 |
Connects network with different data link protocols and simply surround a packet using one protocol |
Encapsulating bridge |
36 |
Type of switches examines the destination of the incoming packet and immediately connecting the port with the incoming message to the correct outgoing port |
Cut through switches |
37 |
Developed TCP/IP |
Vinton cerf and bob kahn |
38 |
Developed TCP/IP for |
US department of Defense |
39 |
Fiber channel class of service also called connection less |
Class 2 |
40 |
Fiber class channel of services where a virtual circuit is established that is guaranteed to provide the requested data transmission |
Class1 |
41 |
Another name for ATM |
Cell relay |
42 |
Atm class of service means that the data transmission rate in the circuit will vary and that the application is tolerant of delays |
VBR-RT |
43 |
Atm class of service means that the data transmission rate in the circuit will vary but that all cells received must be switched immediately upon arrival |
VBR-NRT |
44 |
Fiber optic able is much lighter weighing less than __ pounds per 1000 feet |
10 |
45 |
Cable modems use in tv system and provide data rates |
3 and 50 Mbps |
46 |
Impedance of RG 11 cable |
75 |
47 |
Minimum run length of RG 11 |
700 meters |
48 |
Impedance of RG-58/U |
50 |
49 |
Typical loss of RG-59 cable per 100 meter at 5Mhz |
2.25 |
50 |
Impedance of RG-59 |
75 |
51 |
RS485 can support up to how may devices on one twisted pair |
32 |
52 |
CCIR group that deals with sound broadcasting service |
10 |
53 |
CCIR study group that deals with television broadcasting service |
11 |
54 |
Audio portion of video tape has a bandwidth of |
50 to 10 kHz |
55 |
Video information using mpeg 2 data compression can be reduced in a ratio of |
55:1 |
56 |
Mpeg- 2 data compression can reduced the amount of High definition TV data by |
55 :1 |
57 |
Frame per second are there in a low level mpeg 2 |
30 |
58 |
Cctv system, monitoring, image of person must not be less than |
5% |
59 |
CCTV system, detection, |
10% |
60 |
CCTV system, recognition |
50% |
61 |
Typical wavelength for cctv lighting units |
715 – 850 nm |
62 |
Camera housing index of IP, protection against dirt and dust only |
IP50 |
63 |
Camera housing protection against dirt, dust and moisture |
IP66 |
64 |
Refers to the technology provide enormous storage capacity be daisy-chaining hard disk |
SCSI technology |
65 |
Technology where hard disk are grouped into arrays to provide enormous storage |
RAID technology |
66 |
Equivalent IRE of 0.3 Vsync pulse |
42 IRE |
67 |
For video signals, noise figure less than ___ will result to unacceptable amounts of noise |
40 db |
68 |
S-VHS |
400 |
69 |
VHS |
240 |
70 |
Which office class is the local central office?
|
5 |
71 |
If the code word is only 4 bits for a T1 system with a frame of 193 bits, how many channels can be transmitted?
|
48 |
72 |
The no. of frame alignment bits in DS-1
|
1 |
73 |
Modems use what type of modulation
|
· Phase modulation · Frequency modulation · Amplitude modulation
|
74 |
Pulse dialing rate
|
10 pulse per second |
75 |
added performance feature of modern modems
|
56000 bps |
76 |
Coaxial cable for distribution systems has an impedance |
75 |
77 |
Noise generated by TDM carrier is ____ that generated analog carrier system |
Much less than
|
78 |
The line speed of bell system T1 carrier system is
|
1.544 Mbps |
79 |
ABS-CBN effective radiate power |
346.2 kw |
80 |
Backporch period for horizontal sync |
5.9 micro sec |
81 |
Front porch period for horizontal sync |
1.2 micro sec |
82 |
Impedance UMT cable |
75 |
83 |
Measure using Physical orientation, appearance (keyword lng) |
Geometric datum |
84 |
Presidential decree OMB |
PD 1986 |
85 |
Year turned of SA for better sensitive effectient of GPS system |
2000 |
86 |
Founded IEEE |
1963 |
87 |
Communication _____ fast it generates.... |
Speed |
88 |
Wide area network |
x.25 |
89 |
Greater antenna |
Greater transmit capacity |
90 |
FDDI maximum stations |
1000 |
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