Communications Engineering Coaching Materials: Section 5 Module 16

(Last Updated On: December 8, 2017)

Communications Coaching Materials: Section  5 Module 16

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


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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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