1. Calculate the Antenna power gain for a beamwidth of 10 degrees.A. 20 dB C. 2.6 dBB. 26 dB D. 2.0 dB

2. Calculate the minimum length of a pair of conductors to be considered a transmission line, if its operating frequency is 800 MHz.

A. 37.5 mm C. 37.5 cmB. 375 mm D. 3.75 cm

3. What is the purpose of the indirectly-heated cathode in a cathode ray tube?A. beam modulation C. beam focusingB. beam production D. beam deflection

4. The time transfer accuracy used with reference to the Universal Transmitter Mercator Grid is_____.A. UTC C. GMTB. UTMG D. UTM

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. Brightness of an image is known as _____.A. Luminance C. ReflectanceB. Chrominance D. Radiance

7. The principle of data reduction which says that when reducing a s….. of data into the form of an underlying mode, one should be maximally non-committal with respect to missing data.

A. Jaynes maximum entropy principleB. Maximum entropy principleC. Kullback principle of minimum discriminationD. Minimum discrimination principle

8. In a satellite system, Johannes Kepler stated that “the square of the periodic time of orbit is proportional 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 LawB. 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 constant of 2.3.A. 230 C. 154B. 152 D. 15.2

10. The velocity of sound is a function of _____.A. temperature and volume C. medium and temperatureB. medium and volume D. medium and velocity

11. The frequency stability of cellular mobile telephone transmitter authorized by NTC for use in the 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 be placed above the surface of the earth in order for its rotation to be equal to the earth’s rotation?

A. 23,426.4 mi C. 22,426.4 miB. 27,426.4 mi D. 26,426.4 mi

13. Determine the wavelength of radio waves propagated using a frequency of 30 MHz.A. 15 meters C. 30 metersB. 10 meters D. 9 meters

14. For vertical scanning in a TV system, the field rate is _____ Hz.A. 262 and 1/2 C. 60B. 30 D. 525

15. The actual data rate for terrestrial digital TV transmission to allow for the addition of synchronizing and error-correction bit is _____.

A. 32.28 Mbps C. 48 MbpsB. 8 Mbps D. 64 Mbps

16. According to the NTC memorandum circular, a spectrum user fee of PhP10… per indoor radion 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. 4.8B. 0.44 D. 11

17. What are the letter-number designations of carrier and one SB?A. J3E C. A3EB. H3E D. F3E

18. What layer of the Open Systems Interconnection (OSI) model handles the transmission of bits over a communications channel?

A. physical layer C. data link layerB. transport layer D. network layer

19. Under R.A. 9292, Electronics Technicians may apply for registration without examination within _____ years, after the effectivity of the Republic Act.

A. 7 C. 12B. 10 D. 5

20. What is the effective height of a broadcast antenna if the voltage induced in the 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 metersB. 100 meters D. 127 meters

21. The IEEE standard used for high speed wireless Ethernet access known as Wi-Fi’s is _____.A. 803.12 C. 802.116B. 803.116 D. 801.11

22. Medium-Earth Orbit (MEO) satellite operates in the _____ frequency band.A. 2-18 GHz C. 1.2 – 1.66 GHzB. 1.0 – 2.5 GHz D. 6 – 12 GHz

23. Known as the data transfer scheme that used handshaking principle.A. Synchronous data transfer schemeB. Asynchronous data transfer schemeC. DMA data transfer schemeD. Uninterrupted data transfer scheme

24. What is the delay time for satellite transmissions from earth transmitter to earth receiver.A. 5000 ms C. 500 msB. 50 ms D. 500 us

25. The normal design limitation of a telephone loop is its value of 1 resistance Rz, the maximum value of Rloop must not exceed _____.

A. 5400 ohms C. 2300 ohmsB. 1300 ohms D. 2800 ohms

26. A microwave communications uses plane reflectors as passive repeaters. The diameter of the parabolic antenna is 18 ft while the effective is 310 ft. Determine the reflector coupling factor.

A. 0.76 C. 0.92B. 0.906 D. 0.706

27. Calculate the approximate height of a GEO satellite using Kepler law (A = 42241.0979, P = 0.9972)A. 34,416.40 Km C. 36,000 KmB. 35,790 Km D. 421,164 Km

28. In Satellite Communications, satellites using frequencies between GHz uplink and 17-20 GHz downlink are known to be operating in _____ band.

A. Ka C. xB. Ku D. v

29. Determine the bandwidth efficiency of a 16 QAM modulator using input rate.A. 4 Mbps C. 5 MbpsB. 2 Mbps D. 3 Mbps

30. Determine the shot noise for a diode with a forward bias of 1…. A 110 KHz bandwidth. (q = 1.6x10 raised to minus 19 C)

A. 0.006 uArms C. 0.004 uArmsB. 0.005 uArms D. 0.007 uArms

31. The relative permittivity of silicon is _____.A. 11.7 C. 1.18B. 1.17 D. 11.8

32. A third generation Wireless technology known to deliver broadband data speed to mobile communication device is _____.

A. EDGE C. WiFiB. Bluetooth D. GPRS

33. Which among the IEEE standards, refers to the global specifications of Wireless LAN?A. 802.3 C. 802.11xB. 802.14 D. 802.11b

34. In telecommunications, short haul connection refers to a connection exceeding _____ kilometers.A. 200 C. 250B. 150 D. 300

35. A satellite communication system uses SPADE. The digital modulation technique used in SPADE is _____.A. QPSK C. 8 QAMB. 16 QAM D. BPSK

36. One of the following is NOT a system specification for third generation wireless system.A. TD/CDMA C. CDMA 2000B. WCDMA D. IMT 2000

37. The meaning of MP3 is _____.A. Motion Picture Production, layer 3B. Motion Picture Experts Group 1, Audio Player 3C. Music Production layer 3D. Music Production level 3

38. A receiver produces a noise power of 250 mW with no signal. The output increases to 5W when the signal is applied. Calculate the (S+N)/N power ration in dB.

A. 13 C. 13.22B. 10 D. 20

39. A non-coherent light source for optical communications system.A. ILD C. LEDB. PIN Diode D. APD

40. One of the following is NOT classified as a Customer Premises Equipment (CPE) by the NTC.A. Automatic Teller MachineB. VSATC. Videophone Terminal EquipmentD. ISDN Terminal Equipment

41. Bluetooth Wireless Technology uses _____ technique to produce the spreading function of spectrum signals.A. Hybrid Direct-sequence C. hybrid-frequency hoppingB. direct sequence D. frequency hopping

42. Calculate the maximum theoretical data rate for one satellite transponder used for binary data transmissions.A. 36 Mbps C. 144 MbpsB. 72 Mbps D. 64 Mbps

43. The tunnel diode _____.A. has a tiny hole through its center to facilitate tunnelingB. uses a high doping level to provide a narrow junctionC. works by quantum tunneling exhibited by gallium arsenideD. is joint-contact diode with high 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 ohmsB. 99 ohms D. 188 ohms (PVC = 3.4)(ans = 162.47)http://www.asiinstr.com/technical/Dielectric%20Constants.htm

45. A 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 dBB. 51.2 dB D. 5.2 dB

46. Crosstalk in telephony, refers to the unwanted coupling between signal paths and contribute to noise in the telephone 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. 80B. 70 D. 90

47. The critical maximum value of the external incident angle for which light will propagate in the fiber is known as __________.

A. acceptance angleB. critical angleC. internal incident angleD. critical internal incident 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 MbpsB. 20 Mbps D. 10 Mbps

49. In data communications, network, coaxial cable “RG 11” used for type of application?A. IBM 3270 computer terminalsB. Thick EthernetC. Cable TV SystemsD. Thin Ethernet

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 WB. 120 W D. 24 W

51. A 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. 100,000B. 5 billion D. 10,000

52. The best terrain between antennas is _____, which will prevent re.. effects on the hop.A. rocky C. forestedB. plain and flat D. water surface

53. Best description of a collinear and broadside antenna radiationA. Bidirectional C. Perfect CircleB. Omnidirectional D. Unidirectional

54. The Rules and Regulation governing 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 kmB. 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 MHzB. 107.5 MHz D. 99.5 MHz

56. The velocity of sound in dry 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/sB. 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 C. 0.00279B. 0.002 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 VB. 0.001 V D. 0.01 V

59. One of the following statements is false, regarding making the.. (IL?) very high.A. the image rejection will be very good.B. There is no need to make the local oscillator extremely stable.C. Tracking will be greatly improved.D. The selectivity will be poor.

60. Another name used for optical density is ______.A. light density C. light fluxB. flux density D. radiant flux

61. The hue 180 degrees out of phase with red is _______.A. cyan C. blueB. green D. yellow

62. The composite video signal of TV is composed of the following s…A. camera signal with blanking pulsesB. camera signal with blanking and syncC. blanking signal, horizontal and vertical synchronizing signalD. camera signal, horizontal and vertical synchronizing signal

63. In analog CMTS (AMPS), the narrowband control channel using 395 voice channels is channel ________.A. 12 C. 25B. 30 D. 21

64. A frequency modulation system requires a 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 dBB. 25 dB D. 83.3 dB

65. Which of the following is contained in a fiber optic transmitter?A. an output circuitB. light detectorC. fiber-to-detector connectorD. light source

66. In a PLL frequency demodulator, this information or the modulating signal is the _____ signal.A. phase-shift C. VCOB. error D. input

67. A 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. transmit-receive earth stationB. receive only earth stationC. receive-only satellite earth stationD. transmit-only earth station

68. A typical separation distance between satellites in a geostational orbit is 183.3 miles. In terms of degrees, it is equivalent to ______ degrees.

A. 7 C. 4B. 6 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 MHzB. 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.

A. 73 dBW C. 44 dBWB. 37 dBW D. 70 dBW

71. At 0 degree elevation, a geostationary satellite can cover a maximum of ______ percent of the earth’s surface.A. 66 C. 46B. 42.5 D. 33.33

72. What is the common up-converter and down-converter IF?A. 36 MHz C. 70 MHzB. 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, 59% green, and 12% blueB. 30% red, 59% green, and 11% blueC. 29% red, 60% green, and 11% blueD. 30% red, 58% green, and 12% blue

74. The National Telecommunications Commission (NTC), requires manual installation of Navigational 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. 150B. 80 D. 100

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87. In a spread-spectrum frequency hopping system, a ________ circuit selects frequency modulated by the synthesizer.

A. frequency synthesizer C. PSN code generatorB. FSK oscillator D. frequency shifter

88. Which is the most positive element in the electron guin of TV receivers?A. screen grid C. 1st anodeB. 2nd anode D. control grid

89. A signal which varies between three levels.A. Alternate mark inversion C. Bipolar codeB. RZ D. NRZ

90. An object nearer to a converging lens than its focal point always a/an _______ image.A. the same size C. virtualB. 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 WB. 5 W D. 6 W

92. What synchronizes the horizontal line of the TV picture tube?A. HSC C. HFCB. HAFC D. HAC

93. The ratio of the separation distance between two co-channel cell, the cell radius is known as co-channel _________.

A. reduction interference ratioB. interference ratioC. interference reduction factorD. reduction ratio

94. What causes a herringbone pattern in facsimile?A. noiseB. crosstalkC. phase jitterD. single-frequency interference

95. A 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. Calculate the cut-off wavelength.

A. 3.05 cm C. 1.44 cmB. 4.06 cm D. 5.08 cm

96. In FDM, how many voice band channels are there in a jumbo group?A. 7200 C. 10,800B. 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 MHzB. 559.75 MHz D. 555.25 MHz

98. A parametric amplifier must be cooled _______.A. to provide better amplificationB. to be operational because it cannot operate at room temperatureC. to improve the noise performanceD. to increase the bandwidth

99. Which of the following frequencies is wrong?A. 60 Hz for vertical sync and scanningB. 15,750 Hz for horizontal sync scanningC. 31,500 Hz for equalizing pulses and serrations in the vertical sync pulseD. 31,000 Hz for the vertical scanning frequency

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. 0.0352B. 0.00352 D. 3.52