Seat No. Republic of the Philippines PROFESSIONAL REGULATION COMMISSION Manila BOARD OF ELECTRONICS ENGINEERING ELECTRONICS ENGINEERS Licensure Examination Thursday, April 4, 2019 06 01:00 p.m. — 0 pem. ELECTRONICS SYSTEMS AND TECHNOLOGIES SETA INSTRUCTION: Select the correct answer for each of the following questions. Mark only one answer for each item by shading the box Sorresponding to the ietter of your choice on the answer sheet provided. STRICTLY NO ERASURES ALLOWED. MULTIPLE CHOICE 1, Transmitting of JPEG ‘signal in a bandwidth-limited channel is hardly possible, thus data compression technique is employed. Which technique is used in JPEG? A. Scaled compression B. Genetics compression Cc. Lossless compression D: Lossy compression Antennas have the property of being more sensitive in one direction tha in another which provides the ability to filter signals from its environment. What is this property of the antenna to filter signals? R. Spatial C: Dimensional B. Directivity D. Polarization 3. Consider a noiseless channel with a bandwidth of 10 Khz is transmitting a signal with four level signal levels, what is the maximum bit rate in Kbps the channel can handle? Re 40 c. 80 - B. 20 DB. 60 4. The maximum data rate depends on the bandwidth of the channel. If the channel has a bandwidth of 3,000 Hz, with 256 discrete symbols what is the maximum data speed the channel can handle? ‘A. 96,000 bps C. 48,000 bps B. 24,000 bps D. 12,000 bps . 5. Fiber optic cables are widely used for high-speed data transport. what is the main role of the glass component in a glass fiber optic cable? A. Carry the light C. Prevent light leakages B. Shock absorber D. Protect the cable itself 6. How would you arrange, through a block diagram the relationship of following devices? 1) Mixer 2) RF Amplifier 3) Demodulator 4) AF Amplifier 5) Speaker 6) IF amplifier. A. 3, 2, 4, 1,685 c. 3, 4, 6, 2,185 Bl 2, 6, 4, 3, 165 DL 2, 1, 6, 3, 465 7. A 32 bit (4 byte) I/O bus data transfer size is use for data communications, If the transfer cycle time is 30nS what is the transfer speed (in Mops) of this I/o bus? ‘A. 200.00 B. 133.33 ae De 300.00 1,066.67 Continued on Page 2 Tops ver 2.ELECTRONICS ENGINEERS Licensure Examination Page 2 Thursday, April 4, 2019 - 01:00 p.m. - SET A ELECTRONICS SYSTEMS AND TECHNOLOGIES SETA ELECTRONICS SYSTEMS AND TECHNOLOGIES 8. A point-to-point radio link is to be established between Makets 204 or Laguna, with a distance of 48 miles. NTC allowed the use of 2.0 ale oy the link. Initial survey showed that the line of sight is obsssuccdd pe a 45 ft-building, 15 miles away from one of the locations. 1m the minimum height of the antennas, in feet to clear fror obstruction? A. 90 c. 80 B. 136 D. 100 A signal wave has a velocity of 600,000 meter/sec and a wavelength of 2 meters. What is the frequency of this signal in Hz? ‘A. 120,000 c. 30,000 B. 1,200,000 D: 300,000 10. Signal loss in a given transmission line is affected by several factors like the length or operating frequency. If the frequency is increased, signal loss would " A. increase c. remain the same B. decrease D: not be affected 1. In signal propagation, tha data channel provides the physical path between transmitter and receiver. It could either be guided or unguided Which of the following does not belong to the group? A. Optical fiber ¢. Twisted pair B. Coaxial cable D. Wireless 12. A’signal wave with velocity of 360,800 feet per second has a frequency of 4,400 Hz. What is the wavelength of the signal in meters? A. 29.53 Cc. 82.00 BL 4.99) D. 24.99 13. A device to interconnect DISSIMILAR protocols and servers is called Rr bridge c. server Bl router D. gateways ' 14. The spectrum, 550 to-850 MHz, above the TV channel is available for digital data transmission. Usng a standard TV broadcast channel bandwidth, how many cable TV channels can be used from the available spectrum? A. 75 2c. 83 BL 50 D. 60 15. In laser transmission which describes how much of the range from laser‘ quiescent bias point to cut-off is taken by the signal? A. Optical Dispersion Index C. Quiescent Index B. Bias Index D. Optical Modulation Index dull surface, more of the incident energy is A. regenerated \c reflected B. absorbed by the surface transmitted 16. If the incident angle of the radio wave energy is perpendicular to a 17. You are designing a di: ital micr adio li welt eve ieee as gital microwave radio link and the following data Distance of the link 25 Km Detection threshold -87 dem Transceiver power output 33 dBm Antenna gain 28 dBi each Cable & other losses 25.3 dp Continued on Page 3 TQDS ver 2PRECTRONICS ENGINESRE Licensure Examination mroreday, ABELL €, 2019 6 01100 pame = 064100 Pome Page 3 SARCTRONICE_SYETENE_AND_SECHNOLOOIES ants aay “ o 23. 2a, 2s. 26. Asawaing NC WiLL allow the use of 5 Ge, determine the fade margin of eae TANK, Ay adas ©. 47.4 wala be arth Xm baseband digital tranamiaaion, which Line coding format binary 0 yepresents by NO pulae and binary 1 i represented by a positive pulse? + NRE Bipolar Format &.anchester format BL NRE polar format D. NRE unipolar format Which of the following describes the redirection of a wave front passin Through a Medium Naving a reergetive index between two dissimilar media Ay Deflection + Refraction B. Reflection D. Diffraction XE @ apeech signal has a bandwidth of 3.4 KHz and sampled at a rate of RWe, what will be the bitsrate with an d=pit quantization? AL 64,000 bita/aec C. 16,000 bita/sec BL 12,000 bits/sec D. 27,200 bits/sec A non-periodic composite signal haw a bandwidth of 200 KHz, with a middle frequency of 140 XXz and peak amplitude of 20 V. If the two extreme frequencies have amplitude of 0 V, what is the highest frequenc in KNz of the composite aignal? Ay 200 ©, 340 BL 340 Db. 300 8 ple AN transmitter employs an oscillator of a 20 micro henry coil AO farad capacitor. If the oscillator output is modulated by audi rency Of UP to 24 Kile what in the center frequency of the yanamitter in Ne? AL 195, 772.86 ©. 735,760.88 BL 687,760.87 D. 731,769.88 A s fi & For sky Wave propagation, which highest frequency can be used for Communications between two locations at a given angle of incidence and time of day? ‘A. URE Cc. MUF, BL LUE D. For Which best describes the type of computer-based device that interconnects two LANs of the SANE logical link control protocol and of different medium access control protocol? ‘A. Gateways Cc. Server B. Bridge D. Router he amount of radio signal beflected from a given surface depends on ti nature of the surface and the angle at which the wave strikes the surface. t angle of the radio wave energy is perpendicul: to a dull surface ined A. transmitted ce B. absorbed by the surface Dd. Why is the F2 region mainly r radio-wave propagation? A. Because it is the highest ionosphere region B. Because it is the lowest ionosphere region ' not absorb radio waves as much as other ponsible for the longest distance Continued on Page 4 TDs ver 2AECTRONICS ENGINEERS Licensure Bxamination Thursday, April 4, 2019 = 01100 p.m. = 06200 p.m. ge 4 ELECTRONICS SYSTENS AND TECHNOLOGIES SET_A 27. 28. 29. 30. ais 32. 33. 34. 35. in system networking which device or software program determings the Rext network point to which a packet should be fort d toward ite destination? A. Gateway c. Brida B. Switche D. Router Which of the following det: mines the characteristic impedance of a coaxial antenna feed line? A, The diameter of the braid and the length of the line B. The frequency of the signal and the length of the line €. The diameter of the braid and the frequency of the signal De The ratio of the diameter of the inner conductor to the diameter of the braid Which type of technique does the signal assigned to it for the entire bit time? A. Manchester encoding Cs B. Biphase encodir remain at the binary level Nonreturn to zero (NRZ) 3 D. Return to Zero (R2) In serial type of data transm. last? A. Parity Bit (PB) ficant Bit (LSB) Cl Most Significant Bit (MSB) D. Non-significant Bit (NSB) sion which bit is usually transmitted Which modulation technique requires a frequency band sliced into severe hundred of sub-bands, each of which carries a modulated signal as part of the data stream? A, Differential modulation B. Discrete Multi-tone (DMT) €. Carrier less Amplitude and Phase (CAP) D. Orthogonal modulation In which encoding technique signal voltage amplitude remains at the binary level assigned to it for the entire bit time? A. Singlephase ¢. Return to Zero B. None Return to Zero D. Manchester A simple AM transmitter employs an oscillator of a 10 micro henry coil and 5 nano farad capacitor. If the oscillator output is modulated by audio frequency of up to 24Khz what is the frequency of the upper side band in #2? A. 711,760.88 C. 687,760.88 B. 735,760.88 D. 731,769.88 Which compression and coding algorithm technique preserves all source information so that it can be reconstructed with NO loss of informatio: ‘A. Entrecote C. Entrepot B. Entropy D. Entrails When DC flows through a transmission line, the movement of electrons through the conductor's cross section is uniform. However when AC is applied, the expanding and collapsing fields about each electron encircle other electrons. This retards the movement of the encircled electrons. Which phenomenon is referred to? A. Self-charging C. Self-induction B. Self-discharging D. Self-conduction Continued on Page 5 + TODS ver 2MCTRONICS ENGINE! Meredeys Ape le NEERS Licensure examination 7 2019 - 01:00 p.m. - 06:00 p.m. Page 5 ELECTRONICS SYSTEMS AND LOGIES SETA 36. To Save bandwidth and to transmit more information over a single Gommunication channel, which multiplexing technique is used where messages tr: a ition i frequen epeaeiaus ges are transferred to a new position in the frequency A. Amplitude Multiplexin exing (AM) B. Time Division Multiplexing (TDM) C. Frequency Multiplexing (FM) D. Phase Multiplexing (PM) 37. Which property allows the antenna to emit strong radiation in one favoured direction? A. Directional ¢. Isotropic B. Anisotropic D! Beverage 38. The gain of a parabolic antenna is dependent on the size of the dish anc frequency. what is the effect on the gain if the diameter of the dish it Feduced by half? A. It will decrease by 3 dB c. It will decrease by 6 dB B. It will increase by 6 48 D. It will increase by 3 dB 39. Which component of the Local Area Network (LAN) usually in the form of ¢ hardware card inside the user station, implements the non-physical protccois? A. Physical Interface Unit C. Physical Medium B. User Station D. Protocol Stack 40. Which LAN topology uses a closed, point-to-point-connected loop of stations allowing data to flow in one direction only e.g., from one station to the next? A. Bus c. Star B. Mesh DI Ring 41. The loss in a cable is usually defined in decibels per kilo-meter (4B/km). If the signal at the beginning of a cable (specified as 0.30 aB/km cable) has a power of SmW, what is the power (in dBm) of the signal at 10 km? A. 4.0 c. 3.0 B. 4.8 D. 2.2 42. I£ a 525 MHz transmitter is delivering 50 watts radio signal via RG-8 coaxial transmission line to a perfectly resistive terminating antenna Both the coax and antenna have the same ohmic value, what will be the measured SWR at the feed line? A. lel c. 1:3 B. 1:2 D. 1:5 43. In planning for microwave transmission, we always see to it that the signal is at a certain Fresnel zone clearance. If the microwave frequency is increased, what is its effect on the radius of the Fresne? zone? ‘ A. Decreased c. Undetermined B. Remains the same DB. Increased 44. Which describes the loss of energy of a radio wave because of the Spreading of the wavefront as it travels from the generating source? A. Free-Space ¢. Induction B. Emission D. Scattering Continued on Page 6 TQDS ver 2z. RONICS ENGINEERS Licensure Examination day, April 4, 2019 = 01:00 p.m. = 06100 p.m. Page 6 ELECTRONICS SYSTEMS AND TECHNOLOGIES ‘ SETA 45. In a spread spectrum technology the fré cy of the carrier of the trananeter changed according Gove predetermined sequence, called pseudorandom, ata rate higher than that of the serial binary data modulating the carrier. Which type of spread spectrum this technique i identified to? A. Pha: c. Intermode-hopping BL Direct- D. Frequency-hopping 46. If the radio wave passes from a denser to a less dense medium, the angle of refraction is than the angle of incidence. A. the same c. greater B. undetermined D. less 47, In which type of channel coding is the information bearing message Stream is encoded in a continuous fashion by interleaving information bits and error control bits? A. Manchester ©. Convolution B. Correlation D. Block 48. The beamwidth and the directive gain of the antenna are interrelated with each other. If the beamwidth of the antenna decreases, its directive gain A. increases c. recedes B. decreases D. remains the same 49. Which do you think is the most useful benefits of orthogonal Frequency-Division Multiplexing (OFDM)? A. It spreads the signals over a wide bandwidth, making them less sensitive to the noise, fading, refelctions, and multipath transmission B. Expands the signal over a wide bandwidth thus making it easier to decode. The predicted transmission delay extendsa the speed of the c channel. D. More usable channels can be created due to very low data rate. 50. Signal loss in a given transmission line is affected by several factors like the length or operating frequency of the time. If the frequency is increased, the signal loss would A. increase Feiain the same B. decrease D. not be affected 51, The maximum gain of the antenna is determined by the size of the dish and the frequency. What'is the effect to the gain of the antenna if the diameter of the dish is’ reduced by half? ‘A. Decrease two times C. Increase two time: B. Increase four times D. Decrease four times 52. In spread spectrum (SS) modulation and multiplexing technique, signal and its sidebands are distributed over a very wide bandwidth. SS is als widely used in cellular teléphone networks. Which of the following is also Used to refer to the same technology? ‘A. TACS c. GSM BL 3G D. COMA 53. The net ri tance of the antenna varies with the wavelength. If the horter than one-quarter wavelength, which of the following antenna dominates? A. Inductive reactance B. Resistance C. Capacitive reactance Continued on Page 7 TODS ver 2.J AECTRONICS ENGINEERS Licensure Examination @hursday, April 4, 2019 - 01:00 p.m. - 06:00 p.m. Page 7 ELECTRONICS SYSTEMS AND TECHNOLOGIES SETA 54. 55. 56. 57. 59. 60. 61. 62. 63. 64. D. Capacitive and Inductive reactance are the sane In fiber optic system, which component of the optical cable refracts light back into the inner boundaries of the main cable thus minimizing light leakages? A. Cladding c. Core B. Outer Cover D. Acceptance cone If a digital signal s(t), described at t = tl is sufficient for determining the signal at t =t2 at which the signal also exists, then s(t) represents the so called signal. A. discrete-time C. deterministic B. continuous time D. periodic If the forward gain of a six-element Yagi is about 10 dB, what would th gain of two of these antennas be if they were "stacked"? A. 7 4B c. 13 4B B. 20 dB D. 10 dB In computer networking classful addressing is important as it gives as millions of network addresses. Given this IP address 224-224.224.224 identify what classful address this number belongs. A. Class D Cc. Class C B. Class A D. Class B The ability of an antenna to converge signal energy in a particular direction when transmitting, or to collect signal energy from a particular direction during reception is referred as _ A. diversity €. sensibility B. selectivity D. directivity In traffic engineering, which parameter measures the average number of request for connection per unit time? A. Calling rate ¢. Traffic busy hour B. Traffic rate D. Traffic connection time Which will make the statement NOT TRUE? In order to transfer maximum power between transmit and receive antenna, both antennas myst have the same, s A. spatial orientation c. physical size B. polarization sense D. axial ratio Which describes the method wherein information bearing message stream i encoded in a constant fashion by continuously interleaving information bits and error control bits? A. Convolution Cc. Correlation B. Delta D. Block In analysing the behaviour of light in an optical fiber cable, which ra: travels down the fiber without passing through the axis? A. Skew C. Meridian B. Spin D. Meridional If the power of a signal is 20 mW and the power of the noise is 1 uW, what is the value of SNR? A. 20,000 c. 5,000 B. 50,000 D. 2,000 In sky wave propagation, the skip distance is determined by the A. power fed to the final B. height of the ionosphere and the angle of radiation C. type of transmitting antenna used DB. angle of radiation Continued on Page 8 TQDS ver 2.SLECTRONICS BNGINEERS Licensure Examination PRursday, April 4, 2019 — 01:00 p.m. - 0610C pom. Page & Fs CS _SYSTENS AND TECHNOLOGIES SEE A 6s. 66. 68. 69. 70. 72. 72. Ts 74. According to Fourier analysis, any composite signal is a combination of simple sine waves with different frequencies, amplitudes, and phases. 11 the composite signal is non-periodic, the decomposition gives a combination of sine waves with frequencies. A. infinite “t.Wiserete B. finite D. contiuous Quadrature emplitude modulation (QAM) is a digital modulation technique where the value of a symbol consisting of multiple bits is represented by amplitude and phase states of a carrier. If 16-QAM is four bits per symbol, how many bits per symbol do a 256-QAM represents? c. 8 D. 32 network, the number of subscribers per Cell has tc ° ine the traffic handling capacity of a particula: ing the recommended 0.025 Erlang per subscriber, the Cell needs 5 Eriang. if the number of subscriber is increased to 10,000, what @ be the new design traffic handling capacity (in Erlang) of the c. 1,000 D. 2,000 xn a computer network, which device directs or instructs a packet signa: BE fo°Ehe next Network point it should go towards destination? A. Server c. Bridge B. Router D: Gateway If a -0.3 45/Km cable carries a 10 mW signal at the start, what is the power ~evel (in dBm), 10 Km away? aA. 5 c.7 BL 6 D. 4 A digital tranmission line has a bandwidth of 2 Mhz. With signal-to-noise of 36 dB, what is the maximum capacity the line can handle in Mbps? A. 24 c. 40 B. 54 D. 34 A standard telephone line has a bandwidth of 3,400 Hz, what is the Pequired signal-to-noise ratiovof the channel to handie maximum channel capacity of 30 Kpbs? A. 453 c. 316 B. 453 D. 3,981 he antenna current of an AM transmitter is 15 amperes when only the Carrier is sent but it increases to 17.10 amperes when the carrier is Sinuseidally modulated. How many per cent the carrier is modulated? AL 77.42 c. 80.70 BL 67.49 Ds 70.14 The impedance of a dipole antenna element is dependent on the wavelength. At resonance, what would be the value of the impedance at the middle of its element? ‘A. Low c. Zero B. Infinite D. Bigh y theorem, if the bandwidth TE Eeaucea by 4 times while maintaining the signal-to-noise ratio of th transmission medium at its original ratio, what is the effect on its maximum capacity? ‘A. Reduced by two c. Doubled B. Increased by 4 times D. Reduced by 4 times Continued on Page 9 Tops ver 2.ELECTRONICS EN Thursday, ABELL gee pscensure Examination ~ 01:00 p.m. — 06:00 p.m. Page 8 ELECTRONY CS SYSTEMS AND TECHNOLOGIES SET A 65. Accord:n simple Sine waeee er eemalysis, any composite signal is a combination of She composite soongith dizterent frequencies, amplitudes, and phases. 1 Combination ce eget is non-periodic, the decomposition gives a bination of sine waves with frequencies. Be gates “G discrete a D. contiuous 66. Quadratu ‘ ' Shere che yepiitude modulation (QAM) is a digital modulation technicue By amps ude eg ence omen consisting of multiple bits is represented simeoes Bude and phase states of a carrier. If 16-QAM is four bits per Beet gghow Many bits per symbol do a 256-QAM represents? 2 c. 8 B- 64 D. 32 67. In planning for a GSM network, th bs P 3 won , the number of subscribers per Cell has t& Seah Using the recommended 0.025 Erlang per subscriber, the Cell needs S,belgng, If the number of subscriber is increased to 10,000, what should be the new design traffic handling capacity (in Erlang) of the A. 250 ¢- 1,000 BL 2s DB. 2,000 68. In a computer network, which device directs or instruct: 5 structs a packet signa! as to the next network point it should go towards destination? ° A. Server Cc. Bridge B. Router D. Gateway 69. I£ a -0.3 dB/Km cable carries a 10 mW signal at the start, what is the power “evel (in dBm), 10 Km away? A. 5 G7 B. 6 D. 4 70. A digital tranmission line has a bandwidth of 2 Mhz. With signal-to-noise of 36 dB, what is the maximum capacity the line can handle in Mbps? A. 24 c. 40 B. 54 DB. 34 71. A standard telephone line has a bandwidth of 3,400 Hz, what is the required signal-to-noise ratiosof the channel to handle maximum channel capacity of 30 Kpbs? A. 453 Cc. 316 Bl 453 D. 3,981 72. The antenna current of an AM transmitter is 15 amperes when only the carrier is sent but it increases to 17.10 amperes when the carrier is sinusoidally modulated. How many per cent the carrier is modulated? A. 77.41 c. 80.70 Bl 67.49 D. 70.14 73. The impedance of a dipole antenna element is dependent on the wavelength. At resonance, what would be the value of the impedance at the middle of its element? ‘A. LOW c. zero B. Infinite D. Bigh 74. In the Shannon limit for information capacity theorem, if the bandwidth is reduced by 4 times while maintaining the signal-to-noise ratio of th, transmission medium at its original ratio, what is the effect on its maximum capacity? A. Reduced by two c. Doubled B. Increased by 4 times D. Reduced by 4 times Continued on Page 9 Tops ver 2.J ELECTRONICS ENGINEERS Licen: Examination Thursday, April 4, 2019) - 01:00 p.m. — 06200 p-™- Ease 2 ELECTRONICS SYSTEMS AND TECHNOLOGIES 7S. 76. 78. 79. 80. a1. 82. 83. SETA You are authorized to operate a communication link with a bandwidth of 20,000 Hz. To handle a bit rate of more or less 100,000,000 bits per ond what should be the minimum link signal-to-noise ratio in dB to maintain the desired parameters? A. 10 ¢. 18 B. 30 D. 20 Antenna radiates energy because A. voltage standing wave ratio is high. i B. electrons are accelerated (or are caused to accelerate) in the antenna's elements. C. feed point impedance is maximum. B. phyaisel Link’to the invisible communications medium is present. Which determines the amount of current that can flow when a given voltage is applied to an infinitely very long radio transmission line? A. Frequency ¢. Inductance B. Characteristic impedance D. Capacitance A 1 MBPS signal using a baseband transmission requires a low-pass channel with a bandwidth of 500 KHz minimum. For better transmission th first and the third harmonics were used, what is the needed bandwidth i KHz for this transmission? A. 2,500 c. 250 B. 1,500 D. 2,000 Which is the theoretically infinite number of ellipsoidal areas around the line-of-sight in an RF wireless link? A. Fresnel Zone ¢. Radio horizon B. LOS zone D. Skip zone At resonance, at what point of the one-half wavelength antenna's elemen will the current be at maximum level? ‘A. Middle c. & from the feed point B. 3/4 from the feed point Dd. Ends From the list bellow arrange according to their order starting with the first step the different processes of converting anaclg signal into digital format. 1. Time Division Multiplexing (TDM) 2) Quantizing/companding 3. Line Coding 4. Sampling 5: Pulse Code Modulation (PCM) aA. 3, 4, 2, 1 and 5 C. 4,3, 2, land 5 B. 4, 2, 5, 1, and 3 D. 3, 1, 5, 2, and 4 The characteristic impedance of a transmission line is influenced by several factors. Which of the following does NOT affect the Characteristic impedance of a parallel wire transmission line? A. Radius of the conductors B. Centre to centre distance between conductors 1 Velocity of energy on the line D. Dielectric What kind of transmission line termination does a 100% signal reflectic occurs? ‘A. Capacitive and Inductive C. Purely resistive B. Purely capacitive D. Purely inductive P Continued on Page 10 TQDS ver 2.@LECTRONICS £1 ELECTRONT: a4. as. 86. 87. gs. a9. 90. gi. 92. 2019 ~ 01:00 p.m. - 06:00 p.m. Page 10 s YSTEMS AND TECHNOLOGIES SET A Which layer in the i Open systems Interconnection (OST) model handles the management and synchronization of the data transmission? + Physical : C. Data link B. Transport D. Network Quadrature Amplitude Modulati i ion (QAM) is a digital modulation technique Yhere the value of a symbol consisting of multiple bits is represented by amplitude and phase states of a carrier. If 16-QAM is four bits per ymbol, Row many bits per symbol do a 256-QAM represents? Bi ize Bi et Several methods have been used to ensure reliable transmission error detection. Which of the following method ensures error-free transmissio by which each character transmitted contains one additional bit? A. Redundancy C. Hamming B. Reed Solomon D. Parity bit One of the User Support layers under the Open System Interconnection hierarchical model is the Application Layer (Layer 7). Which of the following is NOT the function of this Layer? \ A. Responsible for encryption and decryption of sensitive information & for compression of the data to be transmitted B. Allows user to access, retrieve, manage and control files in @ remote computer c. Provides basis for e-mail forwarding and storage D. Provides distributed database sources and access for global information about various services what kind of antenna is less likely to pick up man-made interference? A. Half polarized ‘C. Horizontally polarized B. Non-polarized D. Vertically polarized As defined in ANSI X3.4, out of the 128 symbols in ASCII information interchange code, how many are non-printable? A. 32 ce 12 BL 34 D. 94 which type of radio wave travels directly from the transmitter to the receiver and remains in the troposphere? A. Ground Cc. Space B. Sky D. Skip he range of the radar horizon is affected by bending or diffracton of see ctrosagnetic waves. In which portion of the radar frequency bend is diffraction of waves greatest? A. Middle c. upper BL Lower D. Upper Middle = power is applied to a coaxial cable, heat may be generated and as ower 8 0pblife surrounding, chus distorting the orbit of the electrons causing "heating effect” on the non-conductive material electrons, causing tore, This distortion or change in the path of between the conductcore energy, resulting to power loss. This phenonenc fs called loss. Ay dieLedtric C. radiation BL conduction Bl heat Continued on Page 11 reps ver 2J - 01:00 p.m. - 06:00 p.m. Peat ELECTRONICS SYSTEMS AND TECHNOLOGIES SERA 93. In planning for a Gsm network, the number of subscribes per Cell has to be calculated to determine the traffic handling capacity of a particular geil; Using the recommended 0.025 Erlang per subscriber, the Cell needs $ =rlang. If the number of subscriber is increased to 10,000, what should be the new design handling capacity (in Erlang) of the Cell? z c. 1,000 B. 2,000 D. 250 94, When the characteristic of a transmission medium is changed, the wavefront of incoming signal is redirected. Which of the following describes this natural phenomenon? A. Refraction C. Reflection B. Depletion D. Deflection 95. The bandwidth (Bw) of a digital signal depends on the bit rate and the pulse shape used. In dimensionality theorem, if the rate of transmission required is 20Mbps, what must be the minimum BW of the medium? AB. 10 Ghz c. 40 Mhz B. 40 Ghz DI 10 Mhz 96. Which multiplexing technicue signals are spread over_a wide bandwidth, making them less sensitive to the noise, fading, reflections, and multipath transmission effects common in microwave communication systems? A. Phase Shift B. Phase Locked C. Time-Division D. Orthogonal Frequency-Division 97. In radio propagation, the variance of the signal level received at the input of receive and'the radio's specified receiver's sensitivity is generally described as A. system gain 7. net path loss B. fade margin D. system loss 98. In frequency hopping spread spectrum technology, the frequency synthesizer puts out a random sine wave frequency to the mixer, and the mixer creates a new carrier frequency. The time that the synthesizer remains on a single frequency is called _ time. A. hopping c. rest B. leaping D. dwell 99. An SWR meter measures the degree of match between transmission line and antenna by: A. inserting a diode in the feed line B. measuring radiated RF energy C. comparing forward and reflected vlotage D. measuring the conductor temperature 100. What would be the difference (in decibel) to the antenna dish GAIN from its original value if its diameter is increased by threefold while the other parameters remain the same? A. 6 c. 9 B. 3 D. 12 wee END tee WARNING: Failure to submit your Test Questions (Complete) set wil cause the cancellation of your Test-Results for the subject.