Communications Engineering Coaching Materials: Section 5 Module 20

(Last Updated On: December 21, 2017)

Communications Coaching Materials: Section  5 Module 20

This is the Section 5 Module 20 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 20


QUESTIONS

ANSWERS

1.       A parabolic antenna in
which the feed
radiator
 is mounted at or behind the surface of the concave
main parabolic
reflector
 dish.

Cassegrain antenna 

2.       The
downlink frequency or base station to mobile station frequency band in GSM
1800.

1805-1880 MHz

3.       The
nominal channel spacing of time division duplexing (TDD).

5 MHz

4.       In
the IS-95A cellular service, the base station transmit frequency is ___ above
the mobile station transmit frequency.

45 MHz

5.       The
installation tension that can be given to a lightweight internal cable
without causing damage.

100 N

6.       Class
B-1 FM broadcast stations with an authorized transmitter power of 500 watts,
shall in no case have an effective radiated power lower than ____.

1000 W

7.       The
fiber number that has the typical color of orange in multi-core fiber cables.

orange

8.       The
installation tension that can be given to a more rugged fiber cable without
causing damage.

10000 N

9.       Aqua
is the typical color of fiber number ___ in a multi-core fiber.

12

10.    A
signaling path provided by a cable television system to deliver to subscriber
terminal signals that are intended for reception by equipment other than a
television broadcast receiver only when used with auxiliary equipment.

Class III

11.    The
time it takes to transmit 1000 kbps graphic image via a 10 Mbps cable modem.

60 seconds

12.    A
proprietary channel bonding equipment that can boost network up to 108 Mbps
in the Wi-Fi world.

Super G

13.    In
cable television, the receiving antenna should be cut to respective channel
frequency for optimum reception with a front-to-back ratio not less than ___dB

18

14.    The
ideal reverberation time of which is 0.8-1.2 s

Cinema

15.    What
should be avoided inside an acoustical room?

Long echoed voice

16.    One
of the sources of errors of GPS signal is ionospheric effect which
contributes ___ of error.

+/- 5 m

17.    The
first Atlantic telephone cable to use optical fiber that went into operation
in 1988.

TAT-8

18.    When
placing cardiods-patterned microphones, each microphone should be at least
four times as far as from the next one as it is from the sound source. This
is known as a ___ rule.

4-to-1

19.    The
ITU-T recommendation for data compression that was issued in 1990 and uses
the Limpel-Ziv Welch compression algorithm.

V.42bis

20.    A
TV broadcast mainly used in Western Europe.

PAL B/G

21.    A
tape format used in video recording that has a track scanning rotation seep
of 1800 rpm.

Hi8

22.    The
error correction code used by digital video cassette (DVC).

REED-SOLOMON CODE

23.    In
composite video signal measurement, what corresponds to 0 IRE value? 

Blanking pulse

24.    In
composite video signal measurement, what corresponds to 100 IRE value? 

Pure white

25.    The
equation for luminance for TV.

0.3R-0.59G+.11B

26.    The
TV standard which tends to replace PAL/SECAM in Europe.

DVB-T

27.    At
what channel does superband cable television starts.

Channel 23

28.    The
aural deviation for television. 

+/- 25KHz

29.    A3A
is previously known as _____, reduced carrier.

R3E

30.    It
has the compression of 200:1.

MPEG 2

31.    In
microwave communications, the maximum obstruction which a microwave link can
overcome. 

40%

32.    In
Hamming code, there are ___ bits and ____ bits for each parity checking.

4, 3

33.    How
many mastergroups are there in a jumbogroup.

6

34.    This
is done to digital bits of data due to circuitry action so as not to have an
undesired shift.

Reduction of jitter

35.    Aperture
for microwaves

10-60 m

36.    Ratio
of radiographic contrast with  grid to that without a grid.

Contrast Improvement Factor

37.    Antenna
used when there are LC.

Trap antenna

38.    In
_____ 1G Mobile phone with the Nordic Mobile Telephone (NMT) system was
introduced.

1981

39.    The
"call handoff" feature was invented to allow mobile-phone users to travel
during the same conversation.

1984

40.    For
FM stereo, the maximum distance covered is significantly reduced, this is due
to the presence of the _________ kHz subcarrier modulation

38

41.

0.45-0.55

42.
Private operational fixed microwave is on the range of ________ dB.

12.2-12.7

43.
Measurement for protocols.

dBx

44.
Rate for the scanning of 525 lines.

1/30

45.
As per Philippine standard, frequency allocation of AM Radio Broadcasting is
from__________KHz.

526.5-1705

46.
Type of AM which operates at nighttime under 250 W or off-air, field strength up
to 140 mV/m at
1 km.

Class D

47.

15.27

48.
The coding scheme which has the easiest….

BPRZ

49.
The bandwidth covered by the FM for hearing.

50 Hz-15KHz

50.
The most sensitive frequency for human hearing.

1-5 KHz

51.
What type of curve does our ear for telephone used.

A-weighted curve

52.
How many ISDN channels are there?

6

53.
For a reflection of 20 dB, __% is for loss and __% is absorbed by the load.

1, 99

54.
Payment for a 1 MHz bandwidth

500,000

55.
Paid up capital on 3G.

100M

56.
How many horizontal lines are blanked in TV?

42

 57.
Downlink (receiving) assigned to GPRS

28-64 kbps

58.
Disadvantage of slope detection of FM

No noise discrimination

59.
The next channel if there is accommodating the 88.1 MHz channel.

94.1 MHz

60.
The reverberation time for clear speech.

2 secs

61.
The maximum BER for 99.97%

1 in 10 ^3

62. For
illuminating the transducer through the fiber, tungsten halogen lamps or
broadband, ____________ light emitting diodes are suitable.

GaAlAs

63. 802.11
legacy data rates approximately

2 Mbps

64.
High definition TV picture contains about __________ times as much as info as
the present NTSC TV.

5

65.
IMTS2000 maximum data rate for stationary user is 

2Mbps

66.
The process of adjusting the orbit of a geostationary satellite so that it
appears to remain stationary above a point on the earth.

Station keeping

67.
The wavelength commonly used on the modern long distance fiber communications
system.

1550 nm

68.
HDTV compare with NTSC analog.

12 to 18 dbm

69.
Super refraction

Ducting

        70. In
microwave communication, what concepts may be used to analyze interference by
obstacles near the path of a radio beam?

Fresnel zone

71.

connector

72.
In data communications, a 2400 bps modem running Class 4 would appear to
operate at ______ bps.

2900

73.
The full IEEE 1394b specification supports optical connections up to 100
meters in length and data rates all the way to _______ gbps.

3.2

 74. What
wavelength has the minimum loss in optical fibers?

1550 nm

75.
Fine for unauthorized servicing of mobile telephone.

5000/year

76.
What is the maximum power allowable for remote pick up stations used as
broadcast auxiliary services for AM and FM broadcast stations.

35 W

77.
Absorption coefficient of a surface material to absorb sound energy.

0

78.
It is an error-correcting code used for correcting transmission errors in
synchronous data streams.

Hamming in Code

79.
Variation in signal loss.

Fading

80.
It is often defined as the loss incurred by an electromagnetic wave as it
propagates in a straight line through a vacuum with no absorption or
reflection of energy from nearby objects.

Free Space Path Loss

81.
Sampling of an analog signal using a sample-and-hold circuit that the sample
has the same amplitude for its whole duration.

Flat-topped Sampling

82.
Caused by the difference in the propagation times of light rays that take
different path down a fiber.

Acceptance Modal dispersion

83.
Closely related to acceptance angle and is the figure of merit commonly used
to measure the magnitude of the acceptance angle.

Numerical Aperture

84.
Actual user info conveyed through the system.

Payload

85.
A navigational technique that determines position by extrapolating a series
of measured velocity increments.

Dead reckoning

86.
Standard that describes Ethernet-type networks is

IEEE 802.3

87.
The word “Base” in 10BaseT means

The cable carries baseband signals

88.
The primary audio channel remained at 50Hz to 15KHz, while an additional SCA
channel is frequency translated to the   _________ passband.

60 KHz to 74 KHz

89.
The fastest output rate of change (baud) is also equal to ______ of the input
bit rate.

½

90.
The sampling process alters the frequency spectrum and introduces an error
called

Aperture Error

91.
Signal rate of RS 232 normally used as interface between DTE and DCE.

20 kbps

92.
An AM broadcast service area in which groundwave field of 1mV/m (60 dBu) is
not subjected to objectionable interference or objectionable fading.

Primary service area

93.
BW for fiber optics.

900 THz

94.
International frequency distress for radio telephony

2128 KHz

95.Bit
rate of STS-1

51.84 Mbps

96.
Telephone switch that connects only to other switches.

Tandem

97.
802.15.4 also known as

Zigbee

98.
typical range of vidicon dark current

0.2 microampere

99.Shifting
of antenna pattern so that the major lobe is at angle below the horizontal.

Down tilt

100.
Ethernet system that uses a special “Thick Ethernet”

A standard classical

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