Communications Engineering Coaching Materials: Section 5 Module 3

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(Last Updated On: December 8, 2017)

Communications Coaching Materials: Section  5 Module 3

This is the Section 5 Module 3 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 3


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Questions

Answers

1

What is the distance of density diminishes per gravity
distance?

Inverse square law

2

sensitivity

IF amplifier

3

The channel of TV cable frequency range of 5.75MHz-11.75MHz

T1

4

Mechanical splice attenuation loss is

0.1

5

The velocity of sound is considered to be constant at

330 m/s

6

Commonly used telephone wire

AWG #19

7

A low loss dielectric material is used to cover a dish

Radome

8

What is the highest frequency that can be sent straight upward
and return?

critical frequency

9

NAM stands for?

Numeric assignment module

10

RF stage preceeds a superhet reciever ,1 advantage of a good RF
stage is

Better rejection ratio

11

What is the input impedance of a quarter wave length shorted
stub?

Maximum impedance

12

The maximum power output of subscriber

1mW

13

The medium frequency band

0.3-3MHz

14

The acoustics of most auditoriums when the room is full

different

15

Any device to be used as a frequency multiplier

non linear

16

What is a continuous impulse with spikes with short duration
with high amplitudes?

jitter

17

What is the traffic model?

Erlang B

18

Independent side band

B8E

19

The advantage of a cable communication system over a broadcast
system

higher capacity

20

What happens in a capacitor is added in series in an antenna?

It increases the antennas resonate frequency

21

Refers to the relative refractive index

0.1-0.3 %

22

What is the most commonly used intermediate frequency of radar
receivers?

30MHz

23

Not more than___ digits make up an international telephone
number as amended by CCITT

12

24

Twists in twisted wire pairs

Produce electromagnetic interference

25

What is made by the term ?????????????????????

The frequency range over which is expected to perform
well

26

Area of earth the covered by a satellite radio beam

footprint

27

Speaking of antenna, __ is a section of antenna in which would
be a complete antenna by itself

bay

28

Is the process by which a customer maybe accepted with the
absence of establish interference standards that corresponds to the specifications

type acceptance

29

What is the horizontal angle?

azimuth

30

In the TV system is a measure of ability to tell the lining
picture

resolution

31

KBP radio code handles the station provides a minimum of ____
commercial

45 minutes

32

Which of the following is the basic component for satellite
receiver?

transponder

33

In radio communication the term trap antenna is referred to
one of the following statements

Antenna which can be used more than 1 band due to the use
of power in LC
networks

34

The current maximum in a marconni antenna is found at ____

The base of the antenna

35

The antenna effective height is _ to _ actual height

½ to 2/3

36

A computer terminal that will program the perform function

Intelligent terminal

37

The most commonly used Transmission Line in TV system

coaxial cable

38

What type of emission is produced when a frequency modulated
is modulated on TV signal?

F3F

39

What causes quantization in a PCM system?

The approximation of quantized signal

40

With lights not polish into fiber it produces a loss of

4%

41

Frequency division is useful to implementation of a ____

Frequency synthesizer

42

An advantage of FM over AM

Signal to noise improvement

43

Characters that must be transmitted other than data

Overhead

44

What is used in antenna in order to increase it effective
height?

Top Loading

45

Which modulation methods are the most widely used?

Intensity modulation with polarization modulation

46

If the diameter of conductors are two wire Transmission Line

Decrease the impedance

47

Is the aural monochrome television broadcast channel?

4.5 MHz

48

sound generating Modulating waveform for FM will cause a
greater ____

Frequency Deviation

49

The modulation index of an AM is changed from 0 to 1 the
transmitted power is

Increased by 50%

50

What will happen in a quarter wave Transmission Line is
opened?

Behaves as a series short circuit

51

Every time the telephone is answered the handset is of the _
state

On hook state

52

Most fiber optic light sources emit light in which spectrum

infrared

53

Lightning rods mounted at top of structure

30cm

54

What particular stage does frequency provides fidelity?

audio stage

55

Which of the following is not a common light detector

photovoltaic

56

The Gunn diode oscillator

Depends on the formation of charge

57

Creators shall require to provide local exchange service

3

58

Which major element has super heterodyne receiver must be nonlinear?

mixer

59

The SWR is infinite

purely reactive

60

The most commonly used filter SSB generators uses ____

crystals

61

Klystron oscillators frequency range of _____

3000-30000MHz

62

Shortening effect

end effect

63

What is the average insertion loss of fusion splice in Fiber
Optic Cable?

0.09 dB

64

Which of the reception problem that is not multipath?

slow fading

65

mush

66

it is a protocol used to connect the other packets

X.75

67

What is the power loss of a telephone hybrid?

3 dB

68

index multimode optical

0.05

69

What is a measure of reliability express as an average number?

MTBF

70

Term that refers to the numerical range which relates the
performance of one antenna to theoretical antenna

Antenna Gain

71

What is the gateway telecommunications T2?

6.312 Mbps

72

High speed LANs data rate

50-150Mbps

73

rainfall is an important factor of frequency above ____

10GHz

74

What is the basis of the first generation wireless?

Analogue cellular technology

75

When microwave signals follow the curvature of the earth?

ducting

76

quantizing noise occurs in ____

PCM

77

What network provides the greatest?

Pi-L

78

What type of signal selectivity?

SSB voice

79

What circuit is used to detect frequency modulated signal?

Discriminator

80

Number of voice transmission that can be ?????????????????

4

81

popular line wavelength Fiber Optic Cable

1.3 micrometer

82

Which is the simplest effective in changing?

Semiconductor

83

are used in all communication system when propagation time
exceeds ___

50 milliseconds

84

Which stands for dB relative?

dBr

85

atmospheric attenuation

Water vapor and oxygen

86

minimum propagation delay of geo satellite

– 239ms

87

cable consists of twisted pairs of conductors, each separately
insulated

Quad

88

stereophonic FM

30 -53 KHz

89

signal to noise ratio required for satisfactory TV reception

40 dB

90

Start of test for BISYNC

STX

91

Short bit sequence 128 bits

hash

92

rules and description binary

V.1

93

affected by the distance

loudness

94

information about satellite send to earth

TTC

95

if away from source

plane wave

96

measures speed

doppler’s effect

97

measures virtual height of ionosphere

ionosonde

98

sound travels fastest at

solid

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