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
ยท Modem
Ans: PSK
ยท Absorption of impedance Tube
Ans: ฮฑ = 4A1A2 / (A1+A2)2
ยท Impedance acoustics
Ans: Newton seconds per cubic meter
ยท WiMax data rate
Ans: 500 kbps โ 8 Mbps
ยท Formula
Ans: ft = fo + kfoฮT
ยท Blind velocity
Ans: Vb = PRF(nฮป/2)
ยท Spacing of transmission line
Ans: S = ฮปL/360
ยท Transfer of one adjacent walls to another
Ans: Flanking transmission
ยท Range that accepts signal interference
Ans: Blocking range
ยท Sound deduction index
Ans: Transmission loss
ยท Internet cable 6 MHz
Ans: 27 Mbps
ยท Not terrestrial TV
Ans: 8-V.58
ยท Lowest attenuation UHF
Ans: N-type
ยท HF
Ans: affected by the solar cycle
ยท Pag tinanong linear bit PCM code
Ans: n-1
ยท Photon
Ans: E = hf/c h=6.634 x 10-34
ยท SSB
Ans: HF
ยท High Z
Ans: Crystal
ยท U600 bandwidth
Ans: 2520 MHz
ยท Standard VB
Ans: 300 โ 3400 Hz
ยท Voice grade
Ans: 0 โ 4 kHz
ยท 170 ฮฉ/km Customer loop
Ans: AWG22
ยท Determine attenuation to troposcatter
Ans: Scatter angle
ยท Compression
Ans: SSB = 20 log cot(ฯ/2)
ยท Klystron
Ans: n +3/4
ยท Time
Ans: TD = 1.016 โฮพr (length) ns/ft
0 = 360 TD / T
ยท One tenth of the wavelength
Ans: Elementary doublet
ยท FOC data rate
Ans: data rate = 1/5Dd
ยท Minimum height
Ans: ฮป/4
ยท Theoretical height
Ans: ฮป/2 vertical antenna
ยท LORAN C/D accuracy
Ans: 460 m
ยท COR/DME ground navigation
Ans: 108 โ 118 MHz
ยท Repeater fiber optic cable
Ans: 10 โ 30 km
ยท dBa
Ans: 1 uV/m
ยท Bridge
Ans: Physical and data link
ยท Transmission and reception of information
Ans: Session
ยท Transmission of bits
Ans: Physical
ยท Start bit
Ans: 0
ยท Stop bit
Ans: 1
ยท Noise temperature
Ans: 17ยฐC
ยท AC cable
Ans: All of the above
ยท Not specification of 3G
Ans: IMT2000
ยท BW efficiency
Ans: Information density
ยท Resolution
Ans: Resolution = Vmax / DR
ยท Quantization error
Ans: Q = (1/2)Res
ยท Isolation CATV
Ans: 28 dB
ยท Output terminal match CATV
Ans: 16 dB
ยท Disadvantage of plastic over glass
Ans: High attenuation
ยท Mnimum illumination for reading
Ans: 8000 Ix
ยท Impedance at open end of half wave antenna
Ans: 2500 ohms
ยท Max data rate of fiber optic system
Ans: 10 Gbps
ยท Data rate of TDMA
Ans: 8 kbps
ยท WiMax
Ans: 500 kbps to 8 Mbps
ยท H21 broadband ISDN
Ans: 32.786 Mbps
ยท Data rate of terrestrial digital TV
Ans: 32.28 Mbps
ยท V.34
Ans: 33.6 kbps
ยท GPRS
Ans: 172.2 kbps
ยท Bluetooth
Ans: 72 kbps
ยท V.22
Ans: 1200 kbps
ยท V.90
Ans: 56 kbps
ยท V.32
Ans: 9.6 kbps
ยท Speed of IS-95 CDMA
Ans: 1.23 Mbps
ยท WiFi / wireless internet service provider
Ans: 11 Mbps
ยท WiFi spec
Ans: IEEE 802.11b
ยท Spacing between M88 loading coils
Ans: 9000 ft
ยท Area above the vertical antenna
Ans: curve of silence
ยท under the influence of the induction field
Ans: near field
ยท FM luminance frequency for VCR recording
Ans: 3.5 MHz
ยท Measure of comparison of sound intensity with another
Ans: decibel
ยท Used in optical system and satellite telemetry links
Ans: biphase codes
ยท Divide into 4 by ITU
Ans: Facsimile groups
ยท Code transparency with frequency
Ans: bit oriented protocol
ยท ERP of class 2 cellular mobile
Ans: 1.6 W
ยท Max power for class I analog mobile
Ans: 600 mV
ยท Appears at night
Ans: F2 layer
ยท High frequency daytime propagation
Ans: E layer
ยท MF range wavelength
Ans: Hectometric waves
ยท Protocol for packet switching networks
Ans: X.75
ยท Electronic serial number
Ans: 32 bits
ยท Most luminance
Ans: Yellow
ยท Used by Marconi antenna
Ans: below 2 MHz
ยท Mogul-Dellinger fadeout
Ans: sudden ionospheric disturbance frequency
ยท Most commonly used characters are represented in fewer bits
Ans: Huffman encoding
ยท On time of FETs
Ans: Acquisition time
ยท Term for byte in ATM
Ans: Octet
ยท Used in 10/100 Mbps Ethernet
Ans: ISTP cable
ยท Not used in TV
Ans: 108 MHz โ 114 MHz
ยท Does not use error checking
Ans: Physical layer
ยท Demodulates audio signal in TV
Ans: Discriminator
ยท Together with mixer
Ans: local oscillator
ยท Not used in mobile tel.
Ans: balanced detector
ยท Guardband of C-band satellite comm.
Ans: 4 MHz
ยท Minimum quality circuit available in PTN
Ans: basic voice grade
ยท Multichannel network
Ans: broadband
ยท Standard test tone
Ans: 1000 Hz
ยท Average human absorption
Ans: 4.7 units or sabines
ยท Max. critical angle
Ans: Acceptance angle
ยท Software used in preparing packets
Ans: internet protocol
ยท No modulation
Ans: Rest frequency
ยท CMTS(AMPS)
Ans: Less than 2%
ยท Speed of longitudinal waves
Ans: is proportional to the compressibility of the medium
ยท EIRP Class II Cellular
Ans: 1.6 watts
ยท Pulse dialing
Ans: 10 pulses/sec or 600 pulses/minutes
ยท Single-sideband full-carrier
Ans: H3E
ยท Retain local number to access (migration)
Ans: Local number portability
ยท โracewayโ
Ans: Header
ยท Fastest multimedia peripherals
Ans: Firewire
ยท Output Class I mobile output minimum
Ans: 600 mV
ยท Smallest unit data for network
Ans: Packet
ยท UTC
Ans: UTA
ยท Mod used for IS-95
Ans: QPSK (DSSS)
ยท Propagation delay for TDM period
Ans: 577 us
ยท Difference freq for forward and backward transmission
Ans: 45 MHz
ยท Gain at the direction of the major lobe
Ans: Directivity Gain
ยท Code transparency
Ans: Bit-oriented protocol
ยท AM broadcast antenna height
Ans: ฮป/2 vertical antenna
ยท Synchronization 1 V
Ans: Scanning line
ยท Can be eliminated using helical antenna
Ans: Faraday rotation
ยท Companding
Ans: protect small signals from quantizing distortion
ยท Current Maximum for ยผ wavelength Marconi Antenna
Ans: at the base
ยท Synchronous data transfer
Ans: CMT
ยท Electrical signals converted for microphone
Ans: 25 โ 8000 Hz
ยท Reference sound level
Ans: 0 dBm
ยท Bessel 1.0 modulation index
Ans: 3 pairs of sidebands
ยท Common coaxial characteristic impedance
Ans: 50โฆ and 75โฆ
ยท Dead space
Ans: due to shading of hills and trees
Complete List of Communications Engineering Coaching Materials
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