Communications Engineering Coaching Materials: Section 5 Module 10

This is the Section 5 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  5 Module 10

This is the Section 5 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 5 Module 10

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Questions

Answers

1

new name of CCITT

ITU-T

2

Impedance matching ratio of a coax balun

4:1

3

load matching over a range of frequencies

double stub

4

T1 for TDM system

24

5

the final amplifier of either FM or AM transmitter operates as class ____

C

6

8 bits

7

where maximum current and minimum voltage values on a resonant Hertz dipole exist

center of the antenna

8

circuit that is turned on

request to send

9

emission designation for facsimile

A3E and F3C

10

In satellite communication, the geostationary satellites are conveniently located with respect to the equator at ______

0 degrees latitude

11

refers to a double sideband full carrier

A3E

12

the voltage node of a half-wave antenna exists

at feed point

13

the modulation technique used by GSM cellular system

Gaussian Minimum Shift Keying

14

ferrite device that can be used in line of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna

Circulator

15

in shipboard satellite dish antennas system, azimuth is referred as the _____

horizontal aiming of the antenna

16

the total useful information processed or communicated over a specific amount of time

throughput

17

approximate percentage of earth coverage of a geostationary satellite at zero degree elevation

42.5%

18

very early standard that defines binary digits as space/mark line conditions and voltage levels

V.1

19

required minimum power output of an international AM BC stations

50 kW

20

one of the first satellite system catering personal based communications services scheduled for operation

Iridium system

21

propagation condition is usually indicated when a VHF signal is received from a station over 5000 miles away

tropospheric ducting

22

signal to noise ratio that is required for a satisfactory television reception

40dB

23

emission F3F

television

24

single booster installed on the antenna dish of satellite receiver

low noise amplifier

25

noise generated that primarily determines the signal-to-noise ratio in a VHF (150MHz) marine-band receiver

in the receiver front end

26

latest government regulation in the telecommunication which provides policy for the provision of local exchange carrier service

E.O. 109

27

frequency tolerance of an AM radio broadcast station

20 Hz

28

basic mode of transmission system in the public data network in which data are transferred from the source to the network and from the network to the destination in the frame format

Packet Mode

29

type of beam antenna which uses two or more straight elements arranged in line with each other

Yagi Antenna

30

used to connect non-ISDN equipment to ISDN line

Terminal Adapters

31

executive branch of government in charge of policy making in the telecommunications

Department of Transportation and Communications

32

forward link channel

pilot channel

33

phase reversal keying

binary phase

34

each point on a spherical wavefront may be considered a source of secondary spherical wavefronts

Huygen’s Principle

35

term used to describe a spread spectrum communications system where the center frequency of a conventional carrier is altered many times per second in accordance with a pseudo-random list of channels

Frequency hopping

36

frequency bands can be refracted during the day by the D layer

both VLF and LF

37

considered the most frequently used transmission line

flexible coaxial line

38

height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence

virtual height

39

optimum volume per person of rooms for speech

2.8

40

optimum reverberation time at 500 Hz for a cinema

0.8 to 1.2 sec

41

establishes the receiver bandwidth

IF amplifier

42

Flicker noise is a poorly understood form of noise which may be completely ignored about above ____

500 Hz

43

typical gain of a rhombic antenna

between 15 to 60

44

voice band channels in a superjumbogroup

10,800

45

illumination factor is normally considered in computing parabolic antenna gain in microwave communications

0.54

46

in acoustics, reference pressure in lb/ft2 unit

2.089

47

organization that published safety guidelines for the maximum limits of RF energy near the human body

American National Standards Institute (ANSI)

48

measuring a transmitter’s frequency against a suitable standard, the frequency to be

final RF stage

measured is taken from the

 

49

ionosphere most ionized

midday

50

cellular radios use FM with a maximum deviation of ± ______

12 kHz

51

device that measures the angle between two radio frequencies and also the direction of propagation of a wave

goniometer

52

an automated ship-to-shore distress alerting system using satellites and advanced terrestrial communications systems

GMDSS

53

device that measures RF power by measuring the heat the rf power generates

Calorimeter

54

considered the most efficient mode in terms of energy transfer in waveguides

Dominant Mode

55

In acoustics, ______ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener

Doppler Effect

56

oxygen molecule absorption peaks to electromagnetic wave are at what wavelengths

5 mm and 2.5 mm

57

in cellular system, the _____ defines the geographic distance that is required between cells using identical frequencies in order to avoid interference between the radio transmissions at these cells

distance-to-reuse ratio (D/R)

58

the ability of a mobile phone to change from one channel (frequency) to another

Frequency agility

59

in cellular system, the average lead time to install a new base station is approximately ____ months to a year

6

60

at one atmospheric pressure, what is the approximate speed of sound in steel

5150 m/s

61

noise observable up to 8 MHz

space noise

62

in the American standard, the aural transmitter maximum radiated power is ____ of peak visual transmitter power

20 %

63

end impedance of half-wave dipole

2500 Ω

64

standardized as part of GSM phase 2+ that can offer theoretical data speeds up to 115 kbit/s

GPRS

65

channel number of an FM station with a carrier frequency of 99.5 MHz

258

66

comparing the capacities of a DVD and an ordinary CD, DVD is ____ times bigger than CD

15

67

waveguide passive component that brings a smooth change in the direction of axis maintained perpendicular to the plane of polarization

h bend

68

a low frequency audible periodic variation in pitch of sound output in high fidelity sound reproduction system

Wow

69

_____ is a term in the test language for noise testing in telephone circuits that means a one-syllable word consisting of a consonant, a vowel, and another consonant

Logatom

70

why are frequency modulation transmitters more efficient

Because their power is increased by class C amplifiers

71

not an ITU sector

ITU-W

72

a component that samples the microwave signal traveling in one direction down to the transmission line

Directional coupler

73

signal-to-noise ratio is required for satisfactory television reception

40 dB

74

telephone channels in AT 2 line

96

75

maximum power that can be obtained from a microwave tube at 10 GHz

10 W

76

circuit detects frequency modulated signal

Discriminator

77

form of regenerative repeater for transmitting signals over a long cable received through a relay in a clearer form

Interpolator

78

particular wavelength is solar flux measured

10.7 cm band

79

enhancement of GSM including the GPRS

2.5G

80

In television, sync-pulse is ____ IRE

40

81

base-to-mobile frequency assignment of a GSM system

935-960 MHz

82

bits of PREAMBLE in Ethernet frame

56

83

frequency used in communicating for submerged submarines

100 Hz

84

frequency range of radio altimeter

4240 to 4350 MHz

85

used for high definition video and data storage

blu-ray

86

fiber number of multi-core fiber colored white and black

18

87

camera tubes uses lead oxide (PbO) for the photoconductive target plate

plumbicon

88

in accordance with the ITU specifications, the cutoff wavelength of a single-mode fiber is from ____ to _____

1100,1280

89

RS232C uses ____ circuits for protocol handshaking

9

90

standard adopted by the grand alliance in digital broadcasting for multi-channel audio source encoding in America

Dolby standard AC-3

91

the cable type used in CCTV that has a maximum run-length of 250 meters

URM-70

92

lossy real impedance

resistance

93

typical diameter of an external diameter direct burial fiber cable

14.8 mm

94

latitude of international space station

350 km

95

bluetooth

piconet

96

shotckky??? diode or ____ diode

hot carrier

97

decimetric wave

space wave

98

cryptographic

cryptomeria ciper

99

commercial load for TV

18 mins per hour

100

in a single sideband suppressed carrier, what is the maximum instantaneous peak power if PEP is 50 W

10 W

101

cleaving is a process of _____ connecting two fibers

cutting an end fiber in preparation to

Complete List of Communications Engineering Coaching Materials


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