Communications Engineering Coaching Materials: Section 3 Module 4

Print Friendly, PDF & Email
(Last Updated On: December 8, 2017)

Communications Coaching Materials: Section 3 Module 4

This is the Section 3 Module 4 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 3 Module 4

· Modem

Ans: PSK

· Absorption of impedance Tube

Ans: α = 4A1A2 / (A1+A2)2

· Impedance acoustics

Ans: Newton seconds per cubic meter

· WiMax data rate

Ans: 500 kbps – 8 Mbps

· Formula

Ans: ft = fo + kfoΔT

· Blind velocity

Ans: Vb = PRF(nλ/2)

· Spacing of transmission line

Ans: S = λL/360

· Transfer of one adjacent walls to another

Ans: Flanking transmission

· Range that accepts signal interference

Ans: Blocking range

· Sound deduction index

Ans: Transmission loss

· Internet cable 6 MHz

Ans: 27 Mbps

· Not terrestrial TV

Ans: 8-V.58

· Lowest attenuation UHF

Ans: N-type

· HF

Ans: affected by the solar cycle

· Pag tinanong linear bit PCM code

Ans: n-1

· Photon

Ans: E = hf/c h=6.634 x 10-34


Ans: HF

· High Z

Ans: Crystal

· U600 bandwidth

Ans: 2520 MHz

· Standard VB

Ans: 300 – 3400 Hz

· Voice grade

Ans: 0 – 4 kHz

· 170 Ω/km Customer loop

Ans: AWG22

· Determine attenuation to troposcatter

Ans: Scatter angle

· Compression

Ans: SSB = 20 log cot(φ/2)

· Klystron

Ans: n +3/4

· Time

Ans: TD = 1.016 √ξr (length) ns/ft

0 = 360 TD / T

· One tenth of the wavelength

Ans: Elementary doublet

· FOC data rate

Ans: data rate = 1/5Dd

· Minimum height

Ans: λ/4

· Theoretical height

Ans: λ/2 vertical antenna

· LORAN C/D accuracy

Ans: 460 m

· COR/DME ground navigation

Ans: 108 – 118 MHz

· Repeater fiber optic cable

Ans: 10 – 30 km

· dBa

Ans: 1 uV/m

· Bridge

Ans: Physical and data link

· Transmission and reception of information

Ans: Session

· Transmission of bits

Ans: Physical

· Start bit

Ans: 0

· Stop bit

Ans: 1

· Noise temperature

Ans: 17°C

· AC cable

Ans: All of the above

· Not specification of 3G

Ans: IMT2000

· BW efficiency

Ans: Information density

· Resolution

Ans: Resolution = Vmax / DR

· Quantization error

Ans: Q = (1/2)Res

· Isolation CATV

Ans: 28 dB

· Output terminal match CATV

Ans: 16 dB

· Disadvantage of plastic over glass

Ans: High attenuation

· Mnimum illumination for reading

Ans: 8000 Ix

· Impedance at open end of half wave antenna

Ans: 2500 ohms

· Max data rate of fiber optic system

Ans: 10 Gbps

· Data rate of TDMA

Ans: 8 kbps

· WiMax

Ans: 500 kbps to 8 Mbps

· H21 broadband ISDN

Ans: 32.786 Mbps

· Data rate of terrestrial digital TV

Ans: 32.28 Mbps

· V.34

Ans: 33.6 kbps


Ans: 172.2 kbps

· Bluetooth

Ans: 72 kbps

· V.22

Ans: 1200 kbps

· V.90

Ans: 56 kbps

· V.32

Ans: 9.6 kbps

· Speed of IS-95 CDMA

Ans: 1.23 Mbps

· WiFi / wireless internet service provider

Ans: 11 Mbps

· WiFi spec

Ans: IEEE 802.11b

· Spacing between M88 loading coils

Ans: 9000 ft

· Area above the vertical antenna

Ans: curve of silence

· under the influence of the induction field

Ans: near field

· FM luminance frequency for VCR recording

Ans: 3.5 MHz

· Measure of comparison of sound intensity with another

Ans: decibel

· Used in optical system and satellite telemetry links

Ans: biphase codes

· Divide into 4 by ITU

Ans: Facsimile groups

· Code transparency with frequency

Ans: bit oriented protocol

· ERP of class 2 cellular mobile

Ans: 1.6 W

· Max power for class I analog mobile

Ans: 600 mV

· Appears at night

Ans: F2 layer

· High frequency daytime propagation

Ans: E layer

· MF range wavelength

Ans: Hectometric waves

· Protocol for packet switching networks

Ans: X.75

· Electronic serial number

Ans: 32 bits

· Most luminance

Ans: Yellow

· Used by Marconi antenna

Ans: below 2 MHz

· Mogul-Dellinger fadeout

Ans: sudden ionospheric disturbance frequency

· Most commonly used characters are represented in fewer bits

Ans: Huffman encoding

· On time of FETs

Ans: Acquisition time

· Term for byte in ATM

Ans: Octet

· Used in 10/100 Mbps Ethernet

Ans: ISTP cable

· Not used in TV

Ans: 108 MHz – 114 MHz

· Does not use error checking

Ans: Physical layer

· Demodulates audio signal in TV

Ans: Discriminator

· Together with mixer

Ans: local oscillator

· Not used in mobile tel.

Ans: balanced detector

· Guardband of C-band satellite comm.

Ans: 4 MHz

· Minimum quality circuit available in PTN

Ans: basic voice grade

· Multichannel network

Ans: broadband

· Standard test tone

Ans: 1000 Hz

· Average human absorption

Ans: 4.7 units or sabines

· Max. critical angle

Ans: Acceptance angle

· Software used in preparing packets

Ans: internet protocol

· No modulation

Ans: Rest frequency


Ans: Less than 2%

· Speed of longitudinal waves

Ans: is proportional to the compressibility of the medium

· EIRP Class II Cellular

Ans: 1.6 watts

· Pulse dialing

Ans: 10 pulses/sec or 600 pulses/minutes

· Single-sideband full-carrier

Ans: H3E

· Retain local number to access (migration)

Ans: Local number portability

· ‘raceway’

Ans: Header

· Fastest multimedia peripherals

Ans: Firewire

· Output Class I mobile output minimum

Ans: 600 mV

· Smallest unit data for network

Ans: Packet


Ans: UTA

· Mod used for IS-95


· Propagation delay for TDM period

Ans: 577 us

· Difference freq for forward and backward transmission

Ans: 45 MHz

· Gain at the direction of the major lobe

Ans: Directivity Gain

· Code transparency

Ans: Bit-oriented protocol

· AM broadcast antenna height

Ans: λ/2 vertical antenna

· Synchronization 1 V

Ans: Scanning line

· Can be eliminated using helical antenna

Ans: Faraday rotation

· Companding

Ans: protect small signals from quantizing distortion

· Current Maximum for ¼ wavelength Marconi Antenna

Ans: at the base

· Synchronous data transfer

Ans: CMT

· Electrical signals converted for microphone

Ans: 25 – 8000 Hz

· Reference sound level

Ans: 0 dBm

· Bessel 1.0 modulation index

Ans: 3 pairs of sidebands

· Common coaxial characteristic impedance

Ans: 50Ω and 75Ω

· Dead space

Ans: due to shading of hills and trees

Communications Engineering Coaching Materials: Section 3 Module 4

Complete List of Communications Engineering Coaching Materials

Print Friendly, PDF & Email
Help Me Makes a Difference!

P inoyBIX educates thousands of reviewers/students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.

“Will you make a small $5 gift today?”

Add Comment

© 2014 PinoyBIX Engineering. © 2019 All Rights Reserved | How to Donate? | Follow me on Blogarama Protection Status
Do NOT follow this link or you will be banned from the site!

Math Solution

Advanced Math problem age work mixture digit motion Analytic Geometry 01 problem Analytic Geometry 02 problem clock variation progression misc Combination problem Differential Calculus 01 Problem Differential Calculus 02 Problem Differential Equations Problem Fundamentals in Algebra Fundamentals in Algebra Problem Integral Calculus problem Permutation problem Plane Geometry problem Plane Trigonometry problem Probability problem quadratic equation binomial theorem logarithms Solid Geometry problem Spherical Trigonometry problem System of Numbers Problem Venn Diagram Problem

Questions and Answers in Mathematics

Advanced Math Age Work Mixture Digit Motion Algebra and General Mathematics Analytic Geometry 01 Analytic Geometry 02 Calculus Clock Variation Progression Misc Differential Calculus 01 Differential Calculus 02 Differential Equations Engineering Mathematics Geometry Integral Calculus Plane Geometry Plane Trigonometry Probability and Statistics Quadratic Equation Binomial Theorem Logarithms Solid Geometry Spherical Trigonometry System of Numbers Trigonometry


Pre-board in Electronics Engineering

Pre-board in Electronics Engineering - Answers

Questions and Answers

Basic Television - Grob TV Boylestad Questions and Answers Computer Principles Electrical Circuit Electricity and Magnetism Fundamentals Electronic Circuits Floyd Questions and Answers Floyd Self-test Grob Questions and Answers Industrial Electronics Principles and Applications Malvino Questions and Answers Microelectronics Power Generators / Sources / Principles and Applications Solid State Devices Tests and Measurements Vacuum Tubes

Pre-board in Communications Engineering

Pre-board in Communications Engineering Pre-board in Communications Engineering - Answers

Questions and Answers

Acoustics Antennas Blake Questions and Answers Broadcasting and Cable TV System Digital Communication Networks Forouzan Frenzel Self-test Kennedy Questions and Answers Microwave Communications Miscellaneous Questions in Communications Modulation Navigational Aids and Radar Systems Noise Optical Fiber Communications Radiation and Wave Propagation Satellite Communications Transmission Fundamentals Wire and Wireless Communications

GEAS Solution

Dynamics problem Economics problem Physics problem Statics problem Strength problem Thermodynamics problem

Pre-board in GEAS

Questions and Answers in GEAS

Engineering Economics Engineering Laws and Ethics Engineering Management Engineering Materials Engineering Mechanics General Chemistry Physics Strength of Materials Thermodynamics
Online Tool: Electrical Charge Conversions
Online Tool: Electrical Charge Conversions
Online Tool: Color Code Conversions
Online Tool: Color Code Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Temperature Measurement Conversions
Online Tool: Temperature Measurement Conversions
Consider Simple Act of Caring!: LIKE MY FB PAGE

Our app is now available on Google Play, Pinoybix Elex

Get it on Google Play