1. Calculate the Antenna power gain for a beamwidth of 10 degrees. A. 20 dB B. 26 dB
C. 2.6 dB D. 2.0 dB
2.
Calculate Calculate the minimum minimum length length of a pair of conductors conductors to be considered considered a transmis transmission sion line, line, if its operating operating frequency is 800 MHz. A. 37.5 mm C. 37.5 cm B. 375 mm D. 3.75 cm
3.
What is is the purpose purpose of the the indirectly indirectly-heat -heated ed cathode cathode in a cathode cathode ray tube? tube? A. beam modulation C. beam focusing B. beam production D. beam deflection
4.
The time time transfer accuracy used with reference to to the Universal Transmitter Transmitter Mercator Mercator Grid Grid is_____. A. UTC C. GMT B. UTMG D. UTM
quadrupler. 5. A transmitter operates at frequency 144 MHz. the transmitter is using (a) doubler, two tripler and a quadrupler. Calculate its crystal oscillator frequency. A. 2 KHz C. 2000 MHz (2000 KHZ) B. 3000 KHz D. 3 KHz 6.
Bright Brightnes nesss of an an image image is is known known as as _____. _____. A. Luminance C. Reflectance B. Chrominance D. Radiance
7.
The principl principlee of data reductio reduction n which says says that when reducin reducing g a s….. of data data into the form form of an underlyi underlying ng mode, one should be maximally non-committal non-committal with respect to missing data. A. Jaynes maximum entropy principle B. Maximum entropy principle C. Kullback principle of minimum discrimination discrimination D. Minimum discrimination principle
8.
In a satellite satellite system, system, Johannes Kepler Kepler stated stated that “the “the square of the periodic time of orbit is proportional to to the cube of the mean distance between the primary and the satellites”. This is also known as _____. A. Kepler’s 3rd Law C. Kepler’s 2nd Law B. Kepler ’s 1st Law D. Kepler’s Law of Areas
9.
Calculate the time delay in nanosecond introduced by a 100 ft coaxial cable with a dielectric dielectric constant constant of 2.3. 2.3. A. 230 C. 154 B. 152 D. 15.2
10. The velocity velocity of sound sound is a function function of _____. _____. A. temperature and volume C. medium and temperature B. medium and volume D. medium and velocity 11. The frequency stability stability of cellular mobile mobile telephone transmitter transmitter authorized by NTC NTC for use in the Philippines Philippines is _____. A. 3.0 KHz plus or minus 2.0 ppm B. 2.5 KHz plus or minus 2.5 ppm C. 5.2 KHz plus or minus 2.5 ppm D. 5.0 KHz plus or minus 2.0 ppm
12. What height must a satellite satellite be placed above the surface surface of the earth in order for its rotation rotation to be equal to the earth’s rotation? A. 23,426.4 mi C. 22,426.4 mi B. 27,426.4 mi D. 26,426.4 mi 13. Determine the wavelength wavelength of radio radio waves propagated propagated using a frequency of 30 MHz. A. 15 meters C. 30 meters B. 10 meters D. 9 meters 14. For vertical scanning scanning in a TV TV system, system, the field rate rate is _____ Hz. Hz. A. 262 and 1/2 C. 60 B. 30 D. 525 15. The actual data rate for terrestrial terrestrial digital TV transmission transmission to allow for the addition addition of synchronizing and errorerrorcorrection bit is _____. A. 32.28 Mbps C. 48 Mbps B. 8 Mbps D. 64 Mbps 16. According to the NTC memorandum memorandum circular, circular, a spectrum user fee of PhP10… PhP10… per indoor radion station station used for Wireless Data Network shall be paid by the Public Telecom Entity (PTE) with a data rate in excess of _____ Mbps. A. 0.64 C. 4.8 B. 0.44 D. 11 17. What are the letter-number letter-number designations designations of carrier carrier and one SB? A. J3E C. A3E B. H3E D. F3E 18. What layer of the Open Systems Systems Interconnection (OSI) (OSI) model handles the the transmission of bits over over a communications channel? A. physical layer C. data link layer B. transport layer D. network layer 19. Under R.A. 9292, Electronics Electronics Technicians Technicians may apply for for registration without without examination within within _____ years, after the effectivity of the Republic Act. A. 7 C. 12 B. 10 D. 5 20. What is the effective effective height of a broadcast antenna if if the voltage induced in the antenna antenna is 2.7 volts and the measured field intensity received in the antenna site is 27 mV/m? A. 29.7 meters C. 72.9 meters B. 100 meters D. 127 meters Wi-Fi’s is _____. 21. The IEEE standard used for high speed wireless Ethernet access known as Wi-Fi’s A. 803.12 B. 803.116
C. 802.116 D. 801.11
22. Medium-Earth Orbit (MEO) (MEO) satellite satellite operates in the _____ _____ frequency band. A. 2-18 GHz C. 1.2 – 1.66 GHz B. 1.0 – 2.5 GHz D. 6 – 12 GHz 23. Known as the the data transfer transfer scheme that used handshaking principle. principle. A. Synchronous data transfer scheme B. Asynchronous data transfer scheme C. DMA data transfer scheme
D. Uninterrupted data transfer scheme 24. What is the delay time time for satellite transmissions transmissions from earth transmitter transmitter to earth receiver receiver.. A. 5000 ms C. 500 ms B. 50 ms D. 500 us 25. The normal design lim limitation itation of a telephone loop is its its value of 1 resistance Rz, the the maximum value of Rloop must not exceed _____. A. 5400 ohms C. 2300 ohms B. 1300 ohms D. 2800 ohms 26. A microwave microwave communications communications uses plane reflectors as passive passive repeaters. The diameter diameter of the parabolic antenna antenna is 18 ft while the effective is 310 ft. Determine the reflector coupling factor. A. 0.76 C. 0.92 B. 0.906 D. 0.706 27. Calculate the approximate approximate height of a GEO satellite satellite using Kepler law (A = 42241.0979, 42241.0979, P = 0.9972) A. 34,416.40 Km C. 36,000 Km B. 35,790 Km D. 421,164 Km 28. In Satellite Satellite Communications, Communications, satellites using frequencies between between GHz uplink uplink and 17-20 GHz downlink are known to be operating in _____ band. A. Ka C. x B. Ku D. v 29. Determine the bandwidth bandwidth efficiency efficiency of a 16 QAM modulator using input rate. rate. A. 4 Mbps C. 5 Mbps B. 2 Mbps D. 3 Mbps 30. Determine the shot noise noise for a diode with a forward bias of 1…. 1…. A 110 KHz bandwidth. bandwidth. (q = 1.6x10 raised to minus 19 C) A. 0.006 uArms C. 0.004 uArms B. 0.005 uArms D. 0.007 uArms 31. The relative relative permitt permittivity ivity of silico silicon n is _____. A. 11.7 C. 1.18 B. 1.17 D. 11.8 Wireless technology known to deliver broadband data speed to mobile communication device 32. A third generation Wireless is _____. A. EDGE B. Bluetooth
C. WiFi D. GPRS
33. Which among the IEEE IEEE standards, refers to the global global specifications of Wireless Wireless LAN? A. 802.3 C. 802.11x B. 802.14 D. 802.11b 34. In telecommunications, telecommunications, short haul haul connection refers to a connection exceeding _____ kilometers. kilometers. A. 200 C. 250 B. 150 D. 300 35. A satellite satellite communication system uses SPADE. SPADE. The digital modulation modulation technique used in SPADE SPADE is _____. A. QPSK C. 8 QAM B. 16 QAM D. BPSK 36. One of the following following is NOT a system specification specification for third generation wireless system. system.
A. TD/CDMA C. CDMA 2000 B. WCDMA D. IMT 2000 37. The meanin meaning g of MP3 MP3 is _____. _____. A. Motion Picture Production, layer 3 B. Motion Picture Experts Group 1, Audio Player 3 C. Music Production layer 3 D. Music Production level 3 38. A receiver receiver produces a noise power of 250 mW with no signal. The The output increases to 5W when the signal is applied. Calculate the (S+N)/N power ration in dB. A. 13 C. 13.22 B. 10 D. 20 39. A non-coherent light source for optical communications communications system. system. A. ILD C. LED B. PIN Diode D. APD 40. One of the following is NOT classified as a Customer Customer Premises Equipment Equipment (CPE) (CPE) by the NTC. A. Automatic Teller Machine B. VSA V SAT T C. Videophone Terminal Equipment D. ISDN Terminal Equipment 41. Bluetooth Wireless Wireless Technology Technology uses _____ technique technique to produce the spreading function function of spectrum signals. A. Hybr Hybriid Direct rect-s -seq eque uen nce C. hybr hybriid-f d-freq requenc uency y hopp hoppiing B. direct sequence D. frequency hopping 42. Calculate the maximum maximum theoretical data rate rate for one satellite transponder transponder used for binary data transmissions. transmissions. C. 144 Mbps A. 36 Mbps B. 72 Mbps D. 64 Mbps 43. The tunn tunnel el diode diode _____ _____.. A. has a tiny hole through its center to facilitate tunneling B. uses a high doping level to provide a narrow junction C. works by quantum tunneling exhibited by gallium arsenide D. is joint-contact diode with high hi gh reverse resistance 44. What is the characteristic impedance of a basic parallel-wire line, its diameter is 0.023 inches with spacing of 0.14 inches apart, if it uses a dielectric material made of continuous polyvinyl chloride? A. 238.7 ohms C. 234 ohms D. 188 ohms (PVC = 3.4)(ans = 162.47) B. 99 ohms http://www.asiinstr.com/technical/Dielectric%20Constants.htm 45. A transistor transistor amplifier has a measured S/N power of 70 at its input 21 at its output. Determine the noise figure of the transistor. A. 5.1 dB C. 52 dB B. 51.2 dB D. 5.2 dB 46. Crosstalk in telephony, telephony, refers to the unwanted coupling between signal paths and contribute to noise in the telephone receiver. receiver. Calculate crosstalk coupling loss in dBx (one unit of crosstalk in dB above reference coupling) if the crosstalk coupling is 20 dBx. A. 60 C. 80 D. 90 B. 70
47. The critical maximum value of the external incident angle for which light will propagate in the fiber is known as __________. A. acce accept ptan ance ce angl anglee B. crit critic ica al ang angle C. inte intern rnal al inci inciden dentt angl anglee D. criti critical cal inte interna rnall incide incident nt angle angle 48. For an 8 PSK modulation with an input data rate equal to 10 MHz, carrier frequency of 70 MHz, determine the bit rate in the hi-ph channel. A. 5 Mbps C. 3.33 Mbps B. 20 Mbps D. 10 Mbps 49. In data communications, network, coaxial cable “RG 11” used for type of application? A. IBM IBM 3270 3270 comp compute uterr termi terminal nalss B. Thic Thick k Ether therne nett C. Cabl Cablee TV TV Sy System stemss D. Thin Thin Ethe Ethern rnet et 50. Calculate the peak envelope power of a single sideband (SSB) transmitter that produces a peak-to-peak voltage of 240 volts across a 100 ohms antenna load. A. 144 W C. 72 W B. 120 W D. 24 W 51. A digital digital transmission has an error of probability of 10 raised to minus 5 power, and is 1000 million bits long. Calculate the exp… error rate (BER). A. 500 C. 100,000 B. 5 billion D. 10,000 52. The best terrain between antennas is _____, which will prevent re.. effects on the hop. A. rocky C. forested D. water surface B. plain and flat 53. Best description of a collinear and broadside antenna radiation A. Bidirectional C. Perfect Circle B. Omnidirectional D. Unidirectional 54. The Rules and Regulation governing CATV CATV systems in the Philippines defines the specified zone of a TV broadcast station to be the area extending ______ km from reference point in the community to which the station is licensed or authorized. A. 56 km C. 72 km B. 75 km D. 60 km 55. What is the carrier frequency of an FM station with a channel number 300? A. 101.1 MHz C. 107.9 MHz B. 107.5 MHz D. 99.5 MHz 56. The velocity of sound in dr y air medium is 331.45 m/s. Calculate the velocity if there is an increase of temperature equal to 10 degrees Centigrade. A. 341.52 m/s C. 332.52 m/s B. 337.52 m/s D. 332 m/s 57. The input current in a matched transmission line is 50 mA while the current is 2 mA. The line is 1 mile long. Calculate the attenuation coefficient in dB per meters.
A. 0.01738 B. 0.002
C. 0.00279 D. 27.96
58. Determine the maximum quantization error for an 8-bit linear sign-magnitude PCM code for a maximum decoded voltage of 1.27 Vp. A. 0.05 V C. 0.005 V B. 0.001 V D. 0.01 V 59. One of the following statements is false, regarding making the.. (IL?) very high. A. the ima image ge reject rejection ion will will be be very good good.. B. There There is no need need to make the the local local oscillat oscillator or extremely extremely stable. stable. C. Track Tracking ing will will be be greatly greatly impr improve oved. d. D. The sele selecti ctivit vity y will will be poor poor.. 60. Another name used for optical density is ______. A. light density C. light flux B. flux density D. radiant flux 61. The hue 180 degrees out of phase with red is _______. A. cyan C. blue B. green D. yellow 62. The composite video signal of TV is composed of the following s… A. camera camera sign signal al with with blank blanking ing pulse pulsess B. camera camera sign signal al with with blank blanking ing and and sync sync C. blanking blanking signal, signal, horizont horizontal al and vertica verticall synchroniz synchronizing ing signal signal D. camera camera signal, signal, horizonta horizontall and vertical vertical synchroni synchronizing zing signal signal 63. In analog CMTS (AMPS), the narrowband control channel using 395 voice channels is channel ________. A. 12 C. 25 B. 30 D. 21 64. A frequency modulation modulation system requires a signal-to-noise signal-to-noise ratio at the detector output. The modulating frequency is 2 kHz and deviation is 50 kHz. Determine the required minimum S/N at the input. A. 120 dB C. 80 dB B. 25 dB D. 83.3 dB 65. Which of the following is contained in a fiber optic transmitter? A. an out outpu putt circ circui uitt B. ligh lightt dete detect ctor or C. fiber fiber-to -to-de -detec tector tor connec connector tor D. lig light sour sourcce 66. In a PLL frequency frequency demodulator, this information information or the modulating signal is the _____ signal. A. phase-shift C. VCO B. error D. input 67. A satellite satellite earth station designed to receive satellite signals. Such stations may be used to receive data, such as stock market prices or new-wire service or television programs. A. transm transmitit-rec receiv eivee earth earth station station B. receiv receivee only only earth earth statio station n C. receiv receive-o e-only nly satel satellit litee earth earth station station D. transm transmitit-only only earth earth stat station ion 68. A typical typical separation distance between satellites in a geostational orbit is 183.3 miles. In terms of degrees, it is equivalent to ______ degrees.
A. 7 B. 6
C. 4 D. 5
69. What is the cut-off frequency of a rectangular waveguide that has width of 0.6 m and a height of 0.36 m? A. 0.9845 GHz C. 9.8425 MHz B. 9842.5 KHz D. 9842.5 MHz 70. For an earth station transmitter with an output power of 10 kW, a back-off loss of 3 dB, a total branching and feeder loss of 4 dB, transmit antenna gain of 40 dB, determine the EIRP. EIRP. A. 73 dBW C. 44 dBW B. 37 dBW D. 70 dBW 71. At 0 degree elevation, a geostationary geostationary satellite can cover a maximum of ______ percent of the earth’s surface. surface. A. 66 C. 46 B. 42.5 D. 33.33 72. What is the common up-converter and down-converter IF? A. 36 MHz C. 70 MHz B. 40 MHz D. 500 MHz 73. Luminance signals are adjusted to match the brightness sensation of human vision for color television. Thus is _______. A. 29% red, red, 59% 59% green green,, and and 12% 12% blue blue B. 30% red, red, 59% 59% green green,, and and 11% 11% blue blue C. 29% red, red, 60% 60% green green,, and and 11% 11% blue blue D. 30% red, red, 58% 58% green green,, and and 12% 12% blue blue 74. The National Telecommunications Telecommunications Commission (NTC), requires manual installation of Navigational Satellite Satellite Aids Equipment, particularly, NAVTEX receiver and EPIRB equipment to passenger and General C… Vessels engaged in coastwise trade with a gross tonnage of _______. A. 120 C. 150 B. 80 D. 100 . . . . 87. In a spread-spectrum frequency hopping system, system, a ________ circuit selects frequency modulated by the synthesizer. A. frequency synthesizer C. PSN code generator B. FSK oscillator D. frequency shifter 88. Which is the most positive element in the electron guin of TV receivers? A. screen grid C. 1st anode nd B. 2 anode D. control grid 89. A signal which varies between three levels. A. Alternate mark inversion B. RZ
C. Bipolar code D. NRZ
90. An object nearer to a converging lens than its focal point always a/an _______ image. A. the same size C. virtual B. inverted D. smaller 91. The radio transceiver in the SRRS in the Philippines has a maximum transmitted output power of _________. A. 4 W C. 3 W
B. 5 W
D. 6 W
92. What synchronizes the horizontal line of the TV picture tube? A. HSC C. HFC B. HAFC D. HAC 93. The ratio of the separation distance between two co-channel cell, the cell radius is known as co-channel _________. A. reduct reduction ion inte interfe rferen rence ce rati ratio o B. inte interf rfer eren ence ce rati ratio o C. interf interfer erenc encee reduc reductio tion n facto factorr D. redu reduct ctio ion n rati ratio o 94. What causes a herringbone pattern in facsimile? A. noise B. crosstalk C. phas phasee ji jitter ter D. single single-fr -frequ equency ency inter interfer ferenc encee 95. A rectangular rectangular waveguide has the following cross sectional dimension width is 0.8 in., while the height is 0.6 in., as fed by a coaxial at 12 GHz frequency. frequency. Calculate the cut-off wavelength. A. 3.05 cm C. 1.44 cm B. 4.06 cm D. 5.08 cm 96. In FDM, how many voice band channels are there in a jumbo group? A. 7200 C. 10,800 B. 3600 D. 1000 97. Using NTSC standard, what is the aural carrier frequency of UHF TV channel 28? A. 558.75 MHz C. 553.75 MHz B. 559.75 MHz D. 555.25 MHz 98. A parametric parametric amplifier must be cooled _______. A. to provi provide de better better ampl amplifi ificat cation ion B. to be operati operational onal because because it it cannot operat operatee at room temper temperature ature C. to impr improve ove the the noise noise perf perform ormanc ancee D. to increa increase se the bandwi bandwidth dth 99. Which of the following frequencies is wrong? A. 60 Hz for for verti vertical cal syn syncc and scan scannin ning g B. 15,750 15,750 Hz Hz for hori horizon zontal tal sync sync scann scanning ing C. 31,500 31,500 Hz for equalizi equalizing ng pulses and and serrations serrations in in the vertical vertical sync sync pulse D. 31,000 31,000 Hz for the the vertic vertical al scannin scanning g frequen frequency cy 100. An optic fiber is made of glass with a refractive index of 1.54, and clad with another glass with refractive index of 1.50. Launching takes place from air. Calculate the numerical aperture of the fiber. A. 0.352 C. 0.0352 B. 0.00352 D. 3.52
