Communications Engineering Coaching Materials: Section 4 Module 1

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(Last Updated On: December 8, 2017)

Communications Coaching Materials: Section 4 Module 1

This is the Section 4 Module 1 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 4 Module 1


95%

PIN diode is important in detecting light in fiber optic
system. Silicon PIN diode exhibits maximum quantum efficiency of______.

0.10%

GPS accuracy, Doppler frequency

5%

In order to maintain a loss less than 0.3 dB, the displacement
of the fibers must be less than ____

0.2684

Eccentricity of tundra orbit

30%

CDMA system provides capacity of ____ greater than TDMA system

30%

DECT capacity _____ greater(?) than PHS

95%

Silicon PIN Diode … quantum efficiency of Erbium

99.99%

12 dB crest factor of a digital TV

99.99%

… _______ of the time

3.3

In 16:9 HDTV, the optimal viewing distance is ____ times the
picture height

3.579545

Exact color subcarrier

5

Home RF is ____ times greater than Bluetooth

7

Number of categories of UTP cable.

9.296

Morse Code

12.355

Radar nautical miles in microseconds

16

Number of ephemeris parameters

127

Wireless USB (WUSB) can connect to how many interfaces?

163

Number of countries that are members of ISO out of 203
countries

191

Number of countries that are members of ITU

802.14

IEEE standard for TV + data

802.14

TV

802.5

Token Ring

1992

GSM900

1993

In what year did Bluetooth SIG complete Bluetooth Core
Specification 4.0

1993

CIDR

1994

GSM 1800

1996

GSM1900

10000

Number of bundles in flexible endoscopy (3 micron)

21Apr10

Bluetooth V.4.0

11Jun10

Approval of MC 02‐06‐2010

65535

Unicode

0.011 nm/°C

Braggs gratings

300 lb.

Maximum tensile load for lashed aerial cable

41.3 dBm/MHz

Spectral density of Ultrawide band
(UWB)

41.3 dBm/MHz

Spectral density of Ultrawide band
(UWB)

62°C

Stratosphere

>23 db across the channel

0 degree latitude

Position of geostationary satellite at equator

0.011nm/°C

Fiber bragg gradient

0.1 dB

Insertion loss of MEMS

0.2 dB

Average in‐channel insertion loss of DVB‐T

0.275 ± 0.015

Numerical aperture of multimode

0.5 dB/km

Maximum attenuation that a fiber will still work

0.5 dB/km

Grit of less than ____ dB/km

1 hop

Fast hop if greater than ________

1.0 samples per second

GPS and GLONASS data rate

1.2 dB

L to X

1.6 Mbps

Home RF data rate

1.88 1.90 GHz

DECT

1/10 λ

Pair of conductors to be considered as transmission line

1/2 of the original rate

1/4 λ

High voltage, minimum current, voltage is equal to zero at the
center when ____ λ

1/8 spacing

1/m

Unit of Bulk absorption coefficient

10 50 kW

Permissible power in kW at night for Class B

10 m

Ultrawide band (UWB) operating at
3.1 to 10.6 GHz in 110 Mbps can operate at what distance?

10 Mbps

DOCSIS maximum data rate

10 times

802.11b range over Bluetooth

10 times less

How many repeater needed for coax to have the same performance
fiber optic

10^6 10^8

Gain of effective radar receiver

100 kb

JPEG compression of 20:1 ….

100 m

Maximum distance of 10baseT

100 m

Maximum distance of 100baseT

100 Mbps

maximum data rate of CAT 5 UTP cable

100 THz

Past 10 years fiber optics is said to have what theoretical
bandwidth

1000baseT

Which Gigabit Ethernet can support data rate up to 1000 Mbps?

100200 kHz

Low frequency Loran is modified as standard Loran operating at
_______ kHz

100baseT

Generic name for Fast Ethernet standard

1015 MHz

Intermediate RFID

10300 µm

Successive approximation

105 x 74 mm

ID 2, German ID cards issued prior to the November 2010

10base5

10Mbps

11001280 nm

Cut‐off wavelength of single mode glass optical fiber

11501350 nm

Wavelength with minimum loss

1200 bps

Caller ID can sending rate

1209Hz, 1336Hz, 1477Hz,
1633Hz

In DTMF, the horizontal frequencies are ______.

125 ± 3 µm

Multimode glass optical fiber cladding diameter

125 µm

Cladding diameter of step index

13.56 GHz

Type A and Type B proximity cards

14 GHz

Common uplink frequency of Ku Band

15 kV

Dangerous when voltage increases beyond this value (X‐ray)

150 km

In fiber transmission, using a… source the speed is 1Gbps with
the distance of 15 km to ____.

150 m^3/min

…. Peak power of 10kw

155 Mbps

PoS supports minimum data
rate of _______

1575.421227.6 MHz

Center frequency of NAVSTAR GPS

1600 GHz

Bandwidth of fiber optic nowadays

1602.151615.5 MHz

Center frequency of GLONASS

18 m

Diameter of horn‐driven paraboloid

18951918 MHz

DECT

19kHz

Carrier of stereophonic signal

2 to 3

CDMA can increase capacity up to _________ by sectorization

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