This is the Section 3 Module 7 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 7
· Sound energy steam packets
Ans: Phonon
· Unsolicited messages
Ans: Flooding
· Table of GPS satellites
Ans: Ephemeris
· Broadcasting and MMS violated send time
Ans: 9:00 AM to 7:00 PM
· Programmable antenna
Ans: Smart antenna
· Waveguide frequency
Ans: 3000 MHz and above
· Equivalent Cassegrain
Ans: Hoghorn antenna
· Rhombic antenna over others
Ans: Cheaper
· Changing refractive index due to acoustic energy
Ans: Acousto-optic effect
· Vertical loop antenna
Ans: Bidirectional in the Horizontal plane
· Lens used to reduce excess weight
Ans: Zoned lens
· Increase frequency with constant power
Ans: Increase the skip distance
· First avionic to be installed
Ans: Radio transmitter and receiver equipment
· Coupler split
Ans: Beam splitting coupler
· Cut off IF amplifier
Ans: no video but sound is normal
· Amplifier on the output of TV transmitter
Ans: Grid Modulated Class C
· SSB deviation voice communication
Ans: 250 Hz
· SILO
Ans: Signal Intercept for Low Orbit
· Advantage of orbital over synchronous
Ans: No jet propulsion
· Cannot be corrected
Ans: Adjusting the length of the transmission line
· Wavelength of Fiber Optic
Ans: 7000 to 12000 A
· Diameter of coasting of Fiber Optic
Ans: 250 um to 750 um
· Satellite and the sun
Ans: Satellite Sun Conjunction
· Battery of the satellite during eclipse period
Ans: NiCad
· Perpendicular to the misalignment
Ans: Microbend
· Most common AM demodulator
Ans: Envelope detector
· Diode detectors is diodes acts like
Ans: Switches
· Added electric field
Ans: Transverse Magnetic
· Most modulating LASER
Ans: Semiconductor
· SDLC transparency scheme
Ans: Zero Bit Insertion
· VoIP service provider
Ans: P5M
· VoIP reseller
Ans: P1M
· Nighttime
Ans: 1000-2200 UTC
· Daytime
Ans: 2200-1000 UTC
· Delay of satellite
Ans: 270 ms
· Troposcatter hopping range
Ans: 800 km
· Frequency frogging
Ans: Reduce crosstalk
· Clear color TV or more vivid TV
Ans: Comb filter
· POTS
Ans: Plain Old Telephone System
· Video conferencing on telephone lines
Ans: H.261
· Increases height to set in the final orbit
Ans: Apogee Kick motor
· Second satellite
Ans: Secondary Payload
· Location of celestial bodies
Ans: Ephemeris
· Ionic disturbance
Ans: Aurora Borealis
· Coined the word cyberspace
Ans: William Gibson
· Critical frequency for F2 layer
Ans: 8 MHz
· Critical frequency for E layer
Ans: 4 MHz
· MEO distance
Ans: 8000 – 20000 km
· Not to be used at temp more than 52 degrees Celsius
Ans: Crystal microphone
· Used in aviation
Ans: Dynamic microphone
· Varying refraction index
Ans: Fiber grating
· Keyed on/off switching
Ans: Oscillator
· Collects CATV signal
Ans: Head end
· Ultra wideband
Ans: 500 MHz
· PCS narrowband
Ans: 900 MHz
· Uplink rate of GPRS
Ans: 14 kbps
· Vary permanent magnet
Ans: Static convergence
· Vary current (coil)
Ans: Dynamic convergence
· MP3 equivalent in North America
Ans: Dolby AC-3
· Main accelerating element in TV
Ans: Ultor
· Higher Q in smaller dimensions at higher frequencies
Ans: Cavity Resonator
· Light measurement
Ans: Photometry
· X-ray radiation measurement
Ans: Dosimeter
· Mels equivalent to frequency (Hz)
Ans: 40 dB
· Ticking of watch
Ans: 20 phons
· 1/106 Hz
Ans: ppm
· Sample and hold
Ans: Flat top sampling
· TV radiation
Ans: 0.5 milliroentgen
· Equivalent to RADAR
Ans: Light Detection and Ranging
· Light to sound
Ans: Optoacoustic transducer
· Wide aperture area, narrow
Ans: Letter Boxign
· Direct connection through microwave link
Ans: Class I cable TV
· Auxiliary equipment
Ans: Class III cable TC
· Decrease range / decrease interference
Ans: Down tilting
· Low data rate
Ans: Vocoder
· rest frequency
Ans: Carrier frequency
· Eliminate noise
Ans: Cryogenics
· High speed aircraft
Ans: Slot antenna
· Used in gigabit Ethernet
Ans: 4 pair of wire
· Bluetooth power
Ans: 1 mW
· Next technology for Bluetooth
Ans: Lisbon
· Next technology after Lisbon
Ans: Seattle
· Current addressing
Ans: IPv4
· 128 bits
Ans: IPv6
· OMEGA accuracy
Ans: 88% and 98 %
· IMT 2000
Ans: year 2000, 2000 Mhz
· GSM data rate
Ans: 13 kbps
· parity check
Ans: VRC
· Remodulate
Ans: Regenerative repeater
· Uses LC for direct FM transmission
Ans: Reactance modulator
· Speed of sound in steel
Ans: 5150 m/s
· HDTV ___ times information content than NTSC
Ans: 5
· PAL vertical
Ans: 50 Hz
· SEG
Ans: special effects generator
· Before sync pulses
Ans: Front porch
· Metal film resistor flicker noise
Ans: 0.02 to 0.2 uV
· Carbon-composition flicker noise
Ans: 0.1 – 2 uV
· Wire wound flicker noise
Ans: 0.01 – 0.2 uV
· Carbon film flicker noise
Ans: 0.05 to 3 uV
· BER satellite
Ans: 1 part per I billion send
· LMDS frequency range
Ans: 27 – 31 GHz
· WAV format
Ans: 3 minutes ; 30 MB
· MP3 –
Ans: 3 minutes ; 3 MB
· 9600 kbps
Ans: V.32
· Standard for terrestrial TV
Ans: 8-VSB
· GPRS modulation technique
Ans: 3 level Manchester code
· AMI succeeding one’s
Ans: Bipolar violation
· Flagbits HDLC
Ans: 01111110
· Interchanging frequency
Ans: Frequency frogging
· Stereo pilot subcarrier
Ans: 38 kHz
· Lowest note
Ans: Root note
· Printed circuit board – LAN
Ans: NIC
· 120 dB
Ans: Threshold of pain
· Radiation of cordless phone
Ans: 5 mW
· EDGE
Ans: 384 kbps
· Filter selectivity in TV
Ans: surface acoustic wave (SAW)
· SPS (vertical)
Ans: 156 m
· SPS (horizontal)
Ans: 100 m
· SPS (time)
Ans: 340 ns
· PPS (vertical)
Ans: 27.7 m
· PPS (horizontal)
Ans: 22 m
· PPS (time)
Ans: 200 ns
· smith chart (circle)
Ans: impedance repeats every half wavelength
· BISYNC protocol
Ans: Data Link layer
· Waveguide magic T
Ans: hybrid T
· Trapped gas
Ans: Blooming
· Transmit simultaneously
Ans: Contention
· Jet thrusters
Ans: Hydrazine
· GPS orbitals
Ans: 6
· GPS satellite per orbit
Ans: 4
· Ultrasound
Ans: U- weighting
· Pink noise
Ans: Flicker noise
· Exponential decaying
Ans: Maxwell equation
· Color change signal
Ans: Staircase
· Wired equivalent privacy
Ans: WiFi secure link
· Transmitter and receiver
Ans: Anisochronous
· Crystal lattice
Ans: Raman Scattering
· Superheterodyne receiver
Ans: Edwin Armstrong
· Can dial anywhere
Ans: Prepaid Phone card
· Embedded IC on a card
Ans: Smart Card
· 161, for services / emergency
Ans: Service Code
· Thin Ethernet
Ans: Chepernet
· 10 Base 5
Ans: thick Ethernet (standard classical)
· Power of class III mobile phone
Ans: 3 W
· CB
Ans: 40 channels ; 8 km distance
· Portable payphone booth
Ans: TDD
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