Description : A radio communications service use in radio regulation between specified fixed points provided primarily for the safety of air navigation and for the regular efficient and economical air transport ... operation service B. Space service C. Aeronautical mobile service D. Aeronautical fixed service
Last Answer : D. Aeronautical fixed service
Description : What is the current frequency band given most attenuation for satellite communications? A. Ku B. C band C. J D. P
Last Answer : A. Ku
Description : Which band of frequencies used by military for its satellites and radar? A. C band B. X band C. L band D. P band
Last Answer : B. X band
Description : Which of the following is not a common microwave application? A. Radar B. Data transmission C. Space communications D. Mobile radio
Last Answer : D. Mobile radio
Description : ____ system transmits frequency-division-multiplexed voice band signals over a coaxial cable for distances up to 4000 miles. A. T carrier B. X carrier C. L carrier D. F carrier
Last Answer : C. L carrier
Description : The time given in aeronautical communications is: a. Local mean time b. In minutes only c. UTC d. Daylight saving time
Last Answer : c. UTC
Description : Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150MHz) marine-band receiver? A. Man-made noise B. In the atmosphere C. In the receiver front end D. In the ionosphere
Last Answer : C. In the receiver front end
Description : Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150 MHz) marine-band receiver? A. In the ionosphere B. In the receiver rear end C. In the receiver front end D. In the atmosphere
Description : The frequency of Ku band for satellite communications. A. 6/4 GHz B. 14/11 GHz C. 12/14 GHz D. 4/8 GHz
Last Answer : B. 14/11 GHz
Description : What is the quardband between transponder channels in the commercial C-band for satellite communications? A. 6 MHz B. 36 MHz C. 4 MHz D. 2 MHz
Last Answer : C. 4 MHz
Description : Iridium satellites can provide data communications of up ____ bps data rate. A. 1200 B. 4800 C. 2400 D. 3840
Last Answer : C. 2400
Description : Most commercial satellite activity occurs in which band(s)? A. L B. C and Ku C. X D. S and P
Last Answer : B. C and Ku
Description : Who invented Radar? (1) J. H. Van Tassel (2) Wilhelm K. Roentgen (3) P. T. Farnsworth (4) A. H. Taylor and Leo C. Young
Last Answer : A. H. Taylor and Leo C. Young
Description : What band does VSAT first operate? A. L-band B. X-band C. C-band D. Ku-band
Last Answer : C. C-band
Description : What band of frequencies do these satellites operate? A. L band B. Ka band C. C band D. Ku band
Last Answer : A. L band
Description : A band where most military satellite often operate A. Ku B. C C. X D. L
Last Answer : C. X
Description : A band whereloften operate A. Ku B. C C. X D. L
Description : What band does VSAT first operate? A. X-band B. C-band C. Ku-band D. L-band
Last Answer : B. C-band
Description : Which of the following sensor work based on sound navigation ranging? A : Sonar B : Radar C : Intertial D : Biosensor
Last Answer : A : Sonar
Description : What is required for navigation in IMC? a. Radio equipment and equipment for guidance until visual point b. Anti-icing equipment c. A serviceable weather radar d. One VHF box and one HF box
Last Answer : a. Radio equipment and equipment for guidance until visual point
Description : Footprint refers to coverage area in the globe A. Satellite radiation polarization B. Satellite navigation C. Satellite radiation pattern D. Satellite coverage
Last Answer : C. Satellite radiation pattern
Description : ECE Board Exam March 1996 LORAN is a navigation system used primarily for A. approach control B. obtaining fixes over large distances C. blind landing D. automatic collision warning
Last Answer : B. obtaining fixes over large distances
Description : What do you call the random noise seen on radar display screen? A. Impulse noise B. Atmospheric noise C. Grass D. Johnson noise
Last Answer : C. Grass
Description : What determines the ability of radar to determine the bearing to a target? A. Speed of light B. Speed of target C. Antenna directivity D. Frequency of signal
Last Answer : C. Antenna directivity
Description : What is the most commonly used intermediate frequency of radar receivers? A. 40 MHz B. 60 MHz C. 70 MHz D. 30 MHz
Last Answer : D. 30 MHz
Description : What instrument normally measures the virtual height of ionosphere? A. Ionosonde B. Altimeter C. Field meter D. Radar
Last Answer : A. Ionosonde
Description : Which of the following systems is not used in radio detection and ranging? A. Frequency shift B. Frequency modulation C. Pulse radar D. Amplitude modulation
Last Answer : D. Amplitude modulation
Description : RADAR means A. Radio detection and rating B. Radio detection and ranging C. Radio distance and ranging D. Radio delay and ranging
Last Answer : B. Radio detection and ranging
Description : Low-power radar uses A. RIMPATT B. TRAPATT C. Magnetron D. IMPATT
Last Answer : D. IMPATT
Description : The main benefit of light-wave communications over microwaves or any other communications media is a. Lower cost b. Better security c. Wider bandwidth d. Freedom from interference
Last Answer : c. Wider bandwidth
Description : Which of the following is used as an optical receiver in fiber optics communications a. APD b. Tunnel diode c. Laser diode d. LED
Last Answer : a. APD
Description : Which of the following is used as an optical transmitter on the Fiber Optical Communications? a. APD b. LSA diode c. PIN diode d. LED
Last Answer : d. LED
Description : Is a non-coherent light source foe optical communications system. a. ILD b. LED c. APD d. PIN Diode
Last Answer : b. LED
Description : Which does not use vertical polarization antenna? A. AM Broadcasting B. FM Broadcasting C. Mobile Communications D. Satellite Communications
Last Answer : B. FM Broadcasting
Description : Which of the following is the most common application of satellite? A. Surveillance B. Military application C. Communications D. Newscasting
Last Answer : C. Communications
Description : What is the free space attenuation of a satellite communications system operating at 36,000 km above the earth at 5.0 GHz? A. 198 dB B. 202 dB C. 142 dB D. 138 dB
Last Answer : A. 198 dB
Description : The satellite communications channels in a transponder are defined by the A. LNA B. bandpass filter C. mixer D. input signals
Last Answer : B. bandpass filter
Description : The satellite subsystem that monitors and controls the satellite is the A. propulsion subsystem B. power subsystem C. communications subsystem D. telemetry, tracking, and command subsystem
Last Answer : D. telemetry, tracking, and command subsystem
Description : The key electronic component in a communications satellite is the A. telemetry equipment B. on-board computer C. command and control system D. transponder
Last Answer : D. transponder
Description : The main function of a communications satellite is a/ an A. repeater B. reflector C. beacon D. observation platform
Last Answer : A. repeater
Description : Repeaters inside communications satellites are known as A. Trancievers B. Transponders C. Transducers D. TWT
Last Answer : B. Transponders
Description : Name one or more sources of noise bearing on electronic communications. A. Steam boiler B. Galaxies C. Internal combustion engine D. Both B and C
Last Answer : D. Both B and C
Description : A large emission of hydrogen from the sun that affects communications. A. Solar flare B. Cosmic disturbance C. Ballistic disturbance D. Solar noise
Last Answer : A. Solar flare
Description : Is the interference coming from other communications channels? A. Jitter B. Crosstalk C. RFI D. EMI
Last Answer : B. Crosstalk
Description : Noise always affects the signal in a communications systems at the ________. A. transmitter B. channel C. information source D. destination
Last Answer : B. channel