Description : Which transmit only one sideband? A. A3E B. 3AJ C. 11BE D. H3E
Last Answer : D. H3E
Description : What is the emission designation of a single sideband reduced carrier signal? A. H3E B. J3E C. R3E D. B8E
Last Answer : C. R3E
Description : ECE Board Exam March 1996 The letter-number designation B8E is a form of modulation also known as ___________. A. pilot carrier system B. independent sideband emission C. lincomplex D. vestigial sideband transmission
Last Answer : B. independent sideband emission
Description : Refers to the first symbol in an emission designation with an amplitude modulated main carrier represented by letter H. A. Single sideband suppressed carrier B. Double sideband full carrier C. Independent sideband D. Double sideband
Last Answer : B. Double sideband full carrier
Description : In the designation of bandwidth and emission, what letter in the first symbol represents a double-sideband type of modulation? A. A B. B C. C D. H
Last Answer : A. A
Description : Which of the following refers to a double side band full carrier? A. A3E B. A3J C. F3 D. R3A
Last Answer : A. A3E
Description : Refers to an emission designation for facsimile? A. J3E and F4E B. A3J and A4E C. A3E and F3C D. R3E and A3E
Last Answer : C. A3E and F3C
Description : In radio signal emission designation, the fifth symbol means A. Details of signals B. Type of information transmitted C. Nature of multiplexing D. Nature of signal modulating the main carrier
Last Answer : C. Nature of multiplexing
Description : In radio regulation, the first symbol in the designation of radio emission is ______. A. Bandwidth B. Nature of signal(s) modulation the main carrier C. Type of modulation of the main carrier D. Type of information to be transmitted
Last Answer : C. Type of modulation of the main carrier
Description : The third symbol in the designation of radio emission under the ITU rules refers to A. Type of the modulation of the main carrier B. Bandwidth C. Nature of the signals modulating the main carrier D. Type of information to be transmitted
Last Answer : D. Type of information to be transmitted
Description : The first symbol in the designation of radio emission under the ITU rules to A. Nature of signals modulating the main carrier B. Type of information to be transmitted C. Bandwidth D. Type of modulation of the main carrier
Last Answer : D. Type of modulation of the main carrier
Description : What is the required quality factor for an SSB filter with the following data: center frequency= 1 MHz, the desired attenuation level of the unwanted sideband= 80 dB and the separation between sidebands= 200 Hz? A. 1,250 B. 12,500 C. 125,000 D. 25,000
Last Answer : C. 125,000
Description : How many sidebands are present in the J3E mode? A. Two sidebands and a carrier B. One upper sideband C. One lower sideband D. Two carriers and one sideband
Last Answer : B. One upper sideband
Description : Type of modulation used in TV broadcast visual transmitter. A. Pulse modulation B. DSBFC C. Vestigial sideband D. SSBFC
Last Answer : C. Vestigial sideband
Description : A form of single sideband emission where the degree of carrier suppression enable the carrier to be reconstituted and be used for demodulation. A. Half carrier single sideband emission B. Full carrier single sideband emission C. Reduced carrier single sideband emission D. Double sideband emission
Last Answer : C. Reduced carrier single sideband emission
Description : A single sideband emission in which the degree of carrier suppression enables the carrier to be reconstituted and to be used for demodulation. A. Reduce carrier single sideband emission ... single sideband emission C. Full carrier single sideband emission D. Standard single sideband emission
Last Answer : A. Reduce carrier single sideband emission
Description : Which determines the number of sideband components of FM? A. Modulation frequency B. Modulation index C. Carrier frequency D. All of these
Last Answer : B. Modulation index
Description : Is the different angle of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitted. a. Acceptance angle b. Modes c. Sensors d. Aperture
Last Answer : b. Modes
Description : A satellite signal transmitted from a satellite transponder to earth’s station. A. Uplink B. Downlink C. Terrestrial D. Earthbound
Last Answer : B. Downlink
Description : Which of the following is not a way of minimizing if not eliminating noise? A. Use redundancy B. Increase transmitted power C. Reduce signaling rate D. Increase channel bandwidth
Last Answer : D. Increase channel bandwidth
Description : A transmitted signal 5 meters in wavelength is received by an antenna coil having a 50-Ω resistance and a 0.01 H inductance. What is the capacitance of the tuner shunting the antenna coil at this point? A. 0.704 fF B. 0.704 μF C. 0.704 nF D. 0.704 mF
Last Answer : A. 0.704 fF
Description : Part of a microwave link can be approximated by free space conditions. The antenna gain are each 40 dB, the frequency is 10 GHz, and the path length is 80 km. Calculate the receive power for a transmitted power of 10 W? A. 0.871 μW B. 871 μW C. 0.871 mW D. 871 nW
Last Answer : A. 0.871 μW
Description : What height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence? A. Virtual height B. Apparent height C. Actual height D. Effective height
Last Answer : A. Virtual height
Description : Who is responsible in the correctness and accuracy of transmitted information content over a data communication? A. The channel B. The transmitter and receiver C. The modem D. The bridge
Last Answer : B. The transmitter and receiver
Description : The stability of transmitted signal from a simple Hartley oscillator single transmitter which is coupled to and antenna wire affected by ______. A. Chirping of oscillator B. Closer coupling between the oscillator and the antenna. C. Location of antenna D. Material of antenna
Last Answer : B. Closer coupling between the oscillator and the antenna.
Description : In what form does the information of data communications is transmitted between two points? A. Alphanumeric form B. Alphabetic form C. Numeric form D. Binary form
Last Answer : D. Binary form
Description : Known as the satellite transmitted signal form a satellite transponder to earth’s station. A. Uplink B. Down link C. RHCP D. Vertically polarized
Last Answer : B. Down link
Description : Radio wave concentration in the direction of the signal emitted by a directional antenna. A. Back lobe radiation B. Side lobe radiation C. Major lobe radiation D. Transmitted signal
Last Answer : C. Major lobe radiation
Description : What do you call the energy that was not radiated into space or completely transmitted? A. Incident waves B. Captured waves C. Standing waves D. Modulated waves
Last Answer : C. Standing waves
Description : What is the method of diversity reception where the signal is transmitted on 2 different frequencies over the same path? A. Quadruple B. Frequency C. Polarization D. Space
Last Answer : B. Frequency
Description : Satellite signal transmitted from a satellite transponder to earth’s station. A. Vertically polarized B. Uplink C. Downlink D. RHCP
Last Answer : C. Downlink
Description : Energy that has neither been radiated into space nor completely transmitted. A. Captured waves B. Incident waves C. Standing waves D. Modulated waves
Description : The correctness and accuracy of the transmitted message content is A. verified by the modem B. communications system C. determined by the sender and receiver D. ensured by use of digital technique
Last Answer : C. determined by the sender and receiver
Description : In __________ transmission, a unique SYNC character is transmitted at the beginning of each message. A. asynchronous B. synchronous C. digital D. analogue
Last Answer : B. synchronous
Description : What is the first symbol of a radio signal transmission having an amplitude modulated signal carrier, double side band? A. C B. B C. H D. A
Last Answer : D. A
Description : A third symbol emission which represent television. A. C B. D C. F D. A
Last Answer : C. F
Description : A third symbol radio emission which represent telephone transmission including sound broadcasting. A. W B. F C. C D. E
Last Answer : D. E
Description : For 100% modulation, power in each sideband is ________ of that of carrier? a) 50% b) 70% c) 60% d) 25%
Last Answer : Ans: D
Description : What is the output frequency of an upper-sideband parametric-frequency converter?
Last Answer : The sum of the input frequency and the pump frequency.
Description : What is the advantage of single-sideband (ssb) transmission over AM transmission?
Last Answer : The same amount of intelligence can be transmitted with one sixth of the output power with less than one-half the bandwidth.
Description : With a single modulating tone, what is the amplitude of the sideband frequencies at 100-percent modulation?
Last Answer : One-half the amplitude of the carrier.
Description : In an amplitude modulated waveform, the amplitude of the sideband is
Last Answer : 1/2 carrier amplitude x modulation index
Description : For AM, fc =500kHz , fm = 5 kHz Determine: (i) Upper and lower sideband frequencies (ii) Bandwidth
Last Answer : Given data fc = 500KHz , fm = 5KHz USB =fc+fm USB = 500+5 =505 KHz. LSB =fc – fm LSB = 500 – 5 =495 KHz Bandwidth = 2fm . = 2* 5 =10 KHz
Description : The symbol image indicates a:?
Last Answer : fragmentation hazards
Description : On the synchro schematic symbol, what indicates the angular displacement of the rotor?
Last Answer : . The position of the arrow.
Description : The arrow direction in the diode symbol indicates a. Direction of electron flow. b. Direction of hole flow (Direction of conventional current) c. Opposite to the direction of hole flow d. None of the above
Last Answer : b. Direction of hole flow (Direction of conventional current)
Description : Which one from the following is false ? (A) LALR parser is Bottom - Up parser (B) A parsing algorithm which performs a left to right scanning and a right most deviation is RL (1). (C) LR parser is Bottom - Up parser. (D) In LL(1), the 1 indicates that there is a one - symbol look - ahead.
Last Answer : (B) A parsing algorithm which performs a left to right scanning and a right most deviation is RL (1).
Description : The arrow direction in the diode symbol indicates
Last Answer : Flow of current
Description : A disadvantage of using a trap antenna. A. It will radiate harmonics B. It can only be used for single-bad operation C. It is too sharply directional at lower frequencies D. It must be neutralized
Last Answer : A. It will radiate harmonics
Description : Batteries are used to power all satellite subsystems A. at all times B. only during emergencies C. during eclipse periods D. to give the solar arrays a rest
Last Answer : C. during eclipse periods