Communications Engineering Coaching Materials: Section 5 Module 15

This is the Section 5 Module 15 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  5 Module 15

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

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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

Complete List of Communications Engineering Coaching Materials


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