This is the Section 3 Module 6 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 6
· National Frequency IMT2000
Ans: 1920 – 1980 MHz
· Group 3 fax
Ans: between 6 and 15 sec
· Minimum lag
Ans: Plumbicon
· Not needed limiter
Ans: Ratio detector
· Needed limiter
Ans: Foster-Seeley discriminator
· Diameter of single mode of core
Ans: 3 times the wavelength
· 3.58 MHz class C
Ans: no color
· AM frequency
Ans: MF
· Requirements for modems for parallel data transmission using signal frequencies relevant to telephone networks
Ans: V.19
· Specifies full duplex transmission at 14.4 kbps over dial-up connections.
Ans: V.32bis
· Not TDMA
Ans: IS-95
· CDMA
Ans: IS-95
· Apparent loudness of 30 dB
Ans: Moderate
· Hearing range
Ans: 1 to 4 kHz
· At 6 MHz bandwidth
Ans: 3 dB
· Voltage of Ultor
Ans: 30 kV
· Reverberation time of churches
Ans: 7.1
· SSB common filter
Ans: Mechanical filter
· D-AMPS modulation technique
Ans: pi/4 DPQSK modulation
· Least impedance
Ans: Twin lead
· Laser that excites electron
Ans: Pump laser
· 1st tube USSR 1 mW output
Ans: Gyrotron
· Doherty amplifier
Ans: high efficiency
· CDPD data rate
Ans: 19.2 kbps
· Maximum CATV distribution amplifier
Ans: 4
· T1 modulation technique
Ans: PCM and TDM
· Bar code
Ans: 113 lines maximum
· Wireless Internet
Ans: Wi-Fi
· Father of Wi-Fi
Ans: Vic Hayes
· South Korean Wi-Fi
Ans: WiBro
· Bluetooth originates from
Ans: King Harold Blatand
· Glass fiber disadvantage
Ans: Brittleness
· Glass fiber advantage
Ans: Lowest loss
· Core of Plastic Clad Silica
Ans: Silicone Plastic
· Most popular fiber for plastic and glass
Ans: Plastic Clad Silica
· Transmitter on telephone
Ans: Carbon
· 1.6 W
Ans: Class 2
· Analog Microwave
Ans: FM and SSB
· Counterpart of Zigbee
Ans: Nanonet
· Citizen’s Band frequency
Ans: 26.965 – 27.405 MHz
· Inventor of magnetron
Ans: Randall and Boot
· Computer to computer without hub
Ans: crossover hub
· Device in network layer
Ans: Router
· 1 radar nautical
Ans: 12.4 us
· NIC consists of
Ans: BNC and RJ-49
· Chepest connector
Ans: F-connector
· Unsubscribe of service
Ans: opt-out
· Subscribe of service
Ans: opt-in
· Gas inside the tube
Ans: Blue Haze
· Combination of mixer and LO
Ans: Autodyne receiver
· Protects the personnel
Ans: Interlock
· Y signal time delay
Ans: 0.8 us
· Billing avoid fraud
Ans: MIN and ESN
· Nokia, IBM for Bluetooth Standards
Ans: 1998
· FDM telephone
Ans: Single sideband suppressed carrier AM
· Bipolar violation 2 successive 1’s with same magnitude
· … into electrical signal
Ans: FM
· Fiber optic modulation
Ans: Intensity modulation
· Oldest microwave diode
Ans: Point-contact diode
· Longest coverage of earth
Ans: Hemispheric beam
· Circuits family that cannot be interchanged
Ans: V.24
· Bit oriented protocol
Ans: SDLC
· Slope noise
Ans: Delta modulation
· GPS segment
Ans: User, control, and space segment
· Frequency with radar
Ans: Christian Hulsmeyer
· Change password for each user
Ans: Network Administrator
· Improve radials grounded
Ans: Counterpoise
· Losses of FOC
Ans: Scattering, Dispersion and Absorption
· Splicing is better than connector because
Ans: Splicing has no air gap
· Time constant of pre-emphasis network
Ans: 75 us
· Maximum modulating frequency of FM
Ans: 50 Hz
· Cellular phone deviation
Ans: ± 12 kHz
· Orientation of EM wave
Ans: Polarization
· Send end office to telephone when ringing
Ans: Ringback signal
· No synchronization
Ans: BISYNC
· 75% demodulated
Ans: Gray
· 3G standard
Ans: UMTS
· D-AMPS standard
Ans: IS-135
· Base to mobile frequency
Ans: 935 – 960 MHz
· First analogue cellular invented
Ans: NTT
· Rainfall attenuation
Ans: 10 GHz
· TWT frequency
Ans: 8 GHz
· Patent of transmission H scanning lines fiber optics
Ans: J. L. Baird
· Scintillation
Ans: 4 and 6 GHz
· Class B-1
Ans: 5 kW 200 ft.
· Class B
Ans: 30 kW 500 ft.
· Stripping effect fiber optic
Ans: Leaky mode
· Maximum spacing of FM
Ans: 800 kHz
· RF combines with superheterodyne
Ans: Better rejection Ratio
· Noise digital filter
Ans: Zipper noise
· Balun impedance ratio
Ans: 4:1
· Transequatorial propagation
Ans: Afternoon or early evening
· Length of coaxial
Ans: 1.5 km
· Submarine
Ans: Sonobuoy
· Klystron frequency
Ans: 3 – 30 GHz
· Floating
Ans: Buoy antenna
· Analog demodulation of submarine
Ans: TASI
· Area not accepting primary service
Ans: white area
· Field intensity for primary service area
Ans: 1mV/m
· Medium communication military aircraft
Ans: 250 – 400 MHz
· GPS accuracy for civil aircraft
Ans: 100 m
· GPS accuracy for military aircraft
Ans: 16 m
· Short range commercial air navigation
Ans: 30-100 MHz
· Satellite rocket
Ans: Ion propulsion
· Radar range
Ans: Bearing and distance
· Long range civil aircraft
Ans: 2 – 30 MHz
· Camera tube in live TV broadcast
Ans: Image orthicon
· Code Spread Spectrum
Ans: Gold code
· Camera tube shooting still pictures
Ans: Flying spot
· Aluminum screen
Ans: Brighter picture
· Electrical equipment data altitude
Ans: Sun sensor
· GPS altitude
Ans: 20,183 km
· Aeronautical Distress Signal
Ans: 121.5 MHz
· Radiotelegraphy International Distress
Ans: 500 kHz
· ECE Board Resolution number
Ans: 2
· Radio amateur
Ans: Log periodic
· Surface of vehicle airplane
Ans: Skin antenna
· Minimum power hearing
Ans: 0 dB
· Speech power
Ans: 10 – 1000 uW
· Psophometric
Ans: 800 Hz
· FDM-FM
Ans: 1000 mW
· Television education
Ans: ITFS
· Antenna loading, TLC coupling
Ans: Helix House
· Loran A 2H4
Ans: The specific PRR
· Bad language
Ans: Bad filter
· Solar cycle
Ans: 11 years
· Solar noise at 1 GHz
Ans: 280,000 K
· Not bearing and distance
Ans: LORAN C
· Treble below
Ans: 3 kHz
· Bass below
Ans: 300 Hz
· Telephone subscriber loop
Ans: AWG 19
· Day time propagation
Ans: E layer
· Fiber optic frequency range
Ans: 1014 – 1015 Hz
· Packet data, ATM
Ans: PSDN
· Problem of AGC
Ans: Electrolytic deterioration capacitor
· Adjust metallic surface of waveguide
Ans: Piston
· TFTS (Terrestrial Flight Telephone System)
Ans: 1.6 – 1.8 GHz
· Open ended slot antenna
Ans: Notch antenna
· Full wavelength antenna
Ans: Long wire antenna
· Eliminate Standing wave
Ans: Quarter wave Transformer
· Increase effective height
Ans: Adding L in series
· Purely reactive
Ans: SWR is infinite
· Serration
Ans: Horizontal Synchronization
· Monochrome effect cancel effect of signal
Ans: Color killer
· STL (Studio to Transmitter Link)
Ans: 15 W
· Back-up
Ans: 35 W
· Helicopter navigation
Ans: Doppler reference
· Characteristic of aircraft
Ans: Air Data System
· Common Dead Reckoning
Ans: Inertial Navigation
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