(Last Updated On: December 8, 2017)
This is the Section 5 Module 12 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 12
# |
Questions |
Answers |
1 |
The HDTV has an aspect ratio of |
16:9 |
2 |
The maximum frequency deviation in FM TV signal |
25kHz |
3 |
What is the mode of the waveguide is both the magnetic and electric field is parallel in the z-component |
HE |
4 |
What is the baseband frequency for basic super group? |
312 – 552 kHz |
5 |
What is the most commonly used antenna for satellite? |
cassegrain antenna |
6 |
At what speed do electromagnetic wave travel in free space |
about 300 million meters per second |
7 |
An electromagnetic field consists of |
electric and magnetic field |
8 |
the depth of an object submerged in a transparent liquid |
always seems less than its actual |
9 |
when a magnetic field is perpendicular to the surface of the earth, what is the polarization |
horizontal |
10 |
indicate which one of the following terms applies to troposcatter propagation |
Fading |
11 |
the grounds wave eventually disappear as one moves away from the transmitter because of |
tilting |
12 |
the shortest distance measured along the earth’s surface that a sky wave is returned to earth |
skip distance |
13 |
super refraction |
ducting |
14 |
commonly used for LNA |
tunnel diode |
15 |
channels 2, 4, 5, are |
low band VHF |
16 |
filter used for channel 2 to 13 |
band-reject filter |
17 |
frequency for reverberation |
500 Hz |
18 |
space noise is observable at what range of frequencies |
8 to 1.43 GHz |
19 |
a mechanism or device which enables the TC camera to move in lateral and tilting motion |
pan/tilt device |
20 |
which is the first component of any MATV system to receive broadcast signals |
antenna |
21 |
time duration for horizontal trace |
52 us |
22 |
listing of the date and time of events, program etc malfunction and corrections in comm. Systems |
log |
23 |
the CCIR transmission standards for FM sound broadcast at VHF |
Rec. 450.1 |
24 |
which of the class station is a regional channel |
class III-B |
25 |
CCIR standards for internal exchange of programmes on film for television |
rec. 265.6 |
26 |
The channel for cable TV range frequency 5.75 – 11.75 MHz |
T-1 |
27 |
The permissible power in kW of station II-A during nighttime is |
0.25 – 50 |
28 |
MPEG -4 uses what media format |
Divx |
29 |
Glass tube of TWT in coating the aquadag _______ |
Provide attenuation |
30 |
Maximum deviation ratio for TM |
5 |
31 |
TV frequency band of channel 9 |
186 – 192 MHz |
32 |
A means of beyond the line of sight propagation of UHF signals |
Troposcatter propagation |
33 |
Jet thrusters are usually fired to |
maintains the altitude |
34 |
The main function of a communication satellite is as a/an |
repeater |
35 |
A satellite stays in orbit because the following two factors are balanced |
gravitational force and the centrifugal force |
36 |
The maximum distance of an apogee of the ISS |
358 km |
37 |
What modulation is normally used with digital data? |
QPSK |
38 |
When the satellite are spaced 4 degrees of the 360 degrees complete circle, how many parking space or orbit slots are available |
90 |
39 |
In ITU frequency allocation, the earth is divided into |
3 |
40 |
What is the lifetime of ILDs? |
50,000 hrs |
41 |
Light goes from medium A to medium B at an angle of incidence of 40degrees, the angle of refraction is 30 degrees. The speed of light in B |
is less than that in A |
42 |
In a vacuum, the speed of an electromagnetic wave |
is a universal constant |
43 |
Distance near skip distance should be used for sky wave propagation |
to prevent sky-wave and upper ray interference |
44 |
Frequencies in the UHF range normally propagate by means o |
space wave |
45 |
Tropospheric scatter is used with frequencies in the following range |
UHF |
46 |
light of which the following has the shortest wavelength (red,yellow,blue,green) |
blue |
47 |
when a beam light enters one medium from another, a quality that never changes is its |
frequency |
48 |
a means of beyond the line of sight propagation of UHF signals |
troposcatter propagation |
49 |
type of radio wave responsible for long distance communication by multi skips is the |
sky wave |
50 |
System network Architecture uses what protocol |
SDLC |
51 |
EDGE stand for |
Enhanced Data Rates for Global Evolution |
52 |
AM type of emission |
A3 |
53 |
Vestigial sideband emission |
C3F |
54 |
Fiber optics range of temperature during installation |
0 – 60 degrees celcius |
55 |
Range of Bluetooth |
10 meters |
56 |
Using GSM for EDGE, the date transfer rate is _____kbps |
384 |
57 |
Multiplexing used for GSM, 1800 and 1900 MHz |
CDMA |
58 |
Most commercial satellite activity occurs in which band |
C and Ku |
59 |
when a magnetic field is parallel to the surface of the earth, what is the polarization |
vertical |
60 |
when a electric field is perpendicular to the surface of the earth, what is the polarization |
vertical |
61 |
local exchange area defined by the NTC that shares the same local exchange rates |
local exchange service area |
62 |
A sub-discipline of acoustics, it is the study of how sound is generated |
Transduction |
63 |
States the regulations on radio stations and communications |
Act no. 3846 |
64 |
Frequency band of TDM |
1900-1920 MHz ; 2010-2025 MHz |
65 |
Numerical value of the gain of a n isotropic antenna |
1.66 |
66 |
Maximum frequency deviation for FM |
75 KHz |
67 |
Frequency for color black |
2300 Hz |
68 |
Speech coding of 3G system |
Adaptive multirate |
69 |
Waveguide used by lower cut-off frequency is _____ attenuator |
piston |
70 |
Frequency band of industrial, scientific and medical purpose is ___ to ___ GHz |
2.40 to 2.48 |
71 |
Class of radio station with 100kW effective radiated power |
class C |
72 |
Determining the amplitude of an FM sideband requires |
Bessel function |
73 |
SAW device can be used as |
filter |
74 |
Cordless phones beyond 300 ft uses how much power |
10 W |
75 |
Not an advantage of LEO satellites for wireless media |
it uses digital signaling technique |
76 |
Wi-Fi use |
single carrier, direct sequence |
77 |
Not a major section of laser |
monitor |
78 |
Noise reduction coefficient at perfect absorption |
1.0 |
79 |
In fiber optics, splicing |
active |
80 |
Category 6 UTP has how many twisted pair |
4 |
81 |
Advantage of PCM over PAM |
superior noise immunity |
82 |
How long is a 1Mbit image is transmitted using ISDN(64kbps) |
120s |
83 |
In power class E1, the nominal power radiated is ___ dBm |
33 |
84 |
The ionosphere is a region of ionized gas in the upper atmosphere. The ionosphere is responsible for |
long-distance radio communications |
85 |
The main power source for a satellite are |
solar cells |
86 |
Most commercial satellite activity occurs in which band |
C and Ku |
87 |
Common Frequency used for Handy Phone |
1.9 GHz |
88 |
The lowest amount of frequency |
resolution |
89 |
The television picture tube magnetic field can be used for |
beam focusing and beam deflection |
90 |
AM image signal is rejected |
prior to the mixer stage |
91 |
The frequency of oscillation by a magnetron is mainly determined by |
the dimension of each cavity resonator |
92 |
In accordance with ITU specifications, the rate of the dispersion with wavelength for a a single mode fiber must be less than _____- ps/nm^2/km |
0.95 |
93 |
Threshold point of QPSK is plus minus |
0.875 |
94 |
Citizen frequency band radio service is _____ |
26.965 – 27.405 MHz |
95 |
____ GHz/km |
50 – 100 |
96 |
is a signalling message transmitted from the data communications equipment (DCE) indicating to the data terminal equipment (DTE) that it may begin data transmission |
Clear to send |
97 |
9-10 |
|
98 |
Videotext |
|
99 |
30 |
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