Communications Engineering Coaching Materials: Section 1 Module 10

This is the Section 1 Module 10 of the compiled Communications Coaching Materials taken from different sources including but not limited to Communications books, past Board Exams Questions, Journals and the Internet.

Communications Coaching Materials: Section 1 Module 10

This is the Section 1 Module 10 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 1 Module 10

ITEM

QUESTIONS

ANSWERS

1

Human hearing range in octaves

10

2

GPS satellite orbit period

12 hrs

3

GPS constellation radius

20,200 km

4

Advantage of discone

Broadband

5

The trouble when the color oscillator does not oscillate

No color

6

Term for ordinary telephone

POTS (plain old telephone system)

7

The beat frequency between the 3.58 MHz subcarrier and the 4.5 MHz sound signal

0.92 MHz

8

Final amplifier stage

Power amplifier

9

Threshold pain of acoustic shock

120 dB

10

EDGE enhanced GSM

358

11

Standard terrestrial TV transmission

8VSB

12

A call that cannot be completed

Blocked call

13

A vacuum tube used for microwave amplification and oscillation

Klystron

14

CATV level for sound interruption

40 dB

15

CATV is an ex. of Metropolitan area (?)

network

16

Radio system use to provide high speed data packet

GPRS

17

The law tat created the MTRCB

PD 1986

18

Vertical blanking considered as 3 horizontal lines wide

Vertical sync

19

System that does not use TDMA

IS 95

20

Accessory referred to as magic T

Hybrid T

21

For TV system, the horizontal flyback is 10%

6.4 micro seconds

22

Typical speech power of the human ear

10 to 1000 micro watts

23

When was the first mobile phone introduced

Oct 13, 1983

24

Number of HDTV horizontal lines

1125

25

Number of NTSC horizontal lines

525

26

Analog sampling rate (?)

PAM

27

Modulation technique that is noise resistant

PCM

28

Same as Polytetrafluoroethylene

Teflon

29

Coaxial cable insulator

PCV

30

Device located at the middle of a star topography

Hub

31

3 segments of GPS

Space segment, user segment, call(?)

32

WAN physical topography

Packet switching, leased line, circuit switching

33

In fiber optics, when electromagnetic waves scatter and are about equal or more than its wavelength

MIE scattering

34

Most significant part or stage of a launched satellite

Initial payload

35

What is a launched satellite that does not stay in the gravity of the earth and wanders in space

Space probe

36

Also acts as a high pass filter

Waveguide

37

Why is FM more efficient than AM?

Because FM uses class C amplifiers

38

What can achieve a maximum of 100% efficiency

Class C amplifier

39

What can achieve a maximum of 50% efficiency

Class B amplifier

40

Measures the entire electromagnetic wave spectrum

Radiometry

41

Divx (component? Similar format?)

MPEG4

42

When you get the code of a mobile & illegally use it in another mobile to make calls

Clone fraud

43

Why is sidetone necessary?

For the user to know if the telephone is working

44

Two data transmitted in different directions in different time intervals

Time division duplexing

45

Max power of class 3 analog mobile phones

3 Watts

46

Max power of class 2 analog mobile phones

600 milli watts

47

Presidential decree (?)

PD 2004

48

3G (?)

2001

49

When a mobile is simultaneously in the area of coverage/territory of to base stations

Soft handoff

50

Cost of building a base station

$500,000-$750,000

51

Exact frequency of color subcarrier signal (choose 1)

3.579545 MHz or (sadly) 3.579454 MHz

52

Uses lead oxide and has minimum lag

Plumbicon

53

In CATV internet, a 6MHz channel has a data rate of

27 MHz

54

Data rate of fiber optics

20 Gbps

55

AKA grounded antenna

Marconi antenna

56

Radiation pattern of the dipole antenna

Figure 8

57

Smallest block f data transmitted in a network

Packet

58

Time in a day that the human can be exposed to 110-120 dB

20 mins

59

Deafening level of sound for humans

120 dB

60

Navigation system used in ships, submarines, airplanes similar to radar

Inertial Navigation System (INS)

61

A kind of INS where in the sensor is mounted on the face of the ship for direction

Strap-down transducer

62

Multiple programs application run simultaneously without interference

Multitasking

 

Multiple programs run without interference

 

63

2 ships that sank leading to the creation of (INS?)

Republic and Titanic

64

Computer network

Server-client, Peer-to-peer

65

Combination of 2 pts whose magnitudes are equal and opposite in polarity separated by a small space with that of which the filed of dipole that it determines

Electronics doublet

66

In a client-server network ,what LAN software makes sure that data on the server is being changed by one station and is not simultaneously read by another

Record Locking

67

What do you think is the main disadvantage of grid-over plate modulation

Lower power efficiency, difficult to adjust

68

What is another term for pink noise

Flicker noise

69

What refers to a telephone that rings another phone without dialing

Hot line

70

Damage to cells other than reproductive cells due to exposure to intense RF radiation is what

Somatic

71

What do you call the range over… the reference frequency can be… and still achieve phase lock?

Capture range

72

What deice are to be inserted in a telephone channel if the total via net loss of a given trunk circuit exceeds about 2.5db?

Echo Suppressors

73

What is the main advantage of fiber optic cables made of plastic?

Inexpensive and more flexible

74

What LAN topology is used by the classical Ethernet system

BUS topology

75

If a broadcast station is transmitting but not modulating, what is heard in a receiver tuned to its frequency?

Nothing

Complete List of Communications Engineering Coaching Materials


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