EST 4 SectionC4

EST_3_COACHING COMPILATION – EXCEL: SECTION C4

No. Answer Question1. 500-1800 Germanium PIN 0.7A/W is more effective wavelength ranges from__ nanometer2. .9 mm Core diameter of RG 583. +/- 0.1° North- South similar to east- west of C band4. 0.05-100 Hz Required bandwidth for ECG recording5. 0.1 – 5nm Spectrum width of laser diode6. 0.5 A/W Silicon PIN diode having wavelength of 300- 1100 nm, what is the sensitivity7. 0.5 lambda n rectangular waveguide, the critical dimension must be more than ______ at the

lowest frequency to be transmitted8. 0.5 to 5 kW Power needed to sky wave from 100 to 8000 mi.9. 0-2.405 Single mode can only operate if the fiber’s normal frequency is between ______

hz.10. 0-30 miles Ground wave range for VHF has a power of 0.5kW or less11. ½ lambda How many wavelength are in one revolution of Smith Chart12. ½ lambda How many wavelength has in one complete revolution in smith chart?13. 1 Ionosphere14. 1 Photo-current of p-i-n diode15. 1 Photocurrent of pin diode16. 1 reception minute Visual Acuity of tv17. 1 to 20 ms In TDMA, timing 18. 1 to 20 ms In satellite TDMA, the typical frame times range is 19. 1% If ______ less than the maximum amplitude, it will be neglected20. 1.472 Mbps ISDN, H10 super rate..21. 1/10 λ What wavelength will a pair of conductors be considered as a transmission line22. 1/4 wavelength Electrically distance between two holes of simple direction coupler23. 1/8 lambda Sepation between broadside arrays and reflector24. 10 Mhz Maximum BW for a horn antenna25. 10% In KBP standards, 26. 10% An AM radio broadcast station must not operate more than 5% and not lower

than ___27. 1000 base-T Gigabit ethernet implementation28. 100KB Frequency ratio29. 12000 … technology, can operate in repeaterless up to __ km.30. 1209hz

1336hz1477hz1633hz

Horizontal frequencies

31. 13 In what chapter does the electronic code is in the national building code?32. 15m Potato chip effect.. most critical..33. 16 to 640 kHz ADSL upstream34. 16Mbps The new Infrared Data Association (IrDA) …point-to-point operates at the rate of

___?35. 1895 – 1910 MHz PCS allocation channel C36. 2 times the highest

frequency In Nyquist theorem, what is the minimum bit rate?

37. 2.5 degree Celsius In troposphere….. every 300 m.. vertical frequencies in DTMF.38. 2/3 In KBP, the minimum operating time is ____ times the total operating time.39. 2400 bps CDMA, vocoder40. 250 As a fiber optic light source,for S-LED, the data rate is ____ mega bits per second41. 25dB How much greater is the path loss over...distance

42. 3 Ionosphere layers43. 3 How many distinct layer of ionosphere?44. 3 Monopulsereceivers have how many channel45. 3000 MILES in optical transmission, long distance transmission refers to distance up to____46. 34Mbps j.81 ITU-T operate at47. 35,786 km The height above mean sea level of a satellite in a geosynchronous orbit around

Earth is:48. 4 Log periodic array can act as an antenna when it has a minimum of ___ receive

and transmit systems.49. 4 Distance from point sources, doubles, the power density decreases by a factor of

____50. 4.50 Hz Characteristic impedance of baseband coax51. 4:2:2 What sample format which is a video format widely used in processing 52. 40 kW The average power handling capability of inverted cone antenna.53. 400 Mbps Max data rate of ELED(Edge emitting LED)54. 500 to 1800 nm relativity of germanium p-i-n diode 0.7 A/W at ____wavelength 55. 500 to 1800 nm relativity of germanium p-i-n diode 0.7 A/W at ____wavelength56. 50m OTDR should not be used in fiber links below the minimum length of 57. 520 MHz or 420 4:2:2 rate58. 55% In sat comms, aperture efficiency for a circular parabolic antenna?59. 56 bits In the ethernet frame, the preamble consists of how many bits?60. 6 Allocation channel for PCS61. 6000 In tradition four wire circuit such as T1 and E1 requires _____ repeaters.62. 6B Channels In ISDN channel, H-0 (zero) technology63. 6dbi, 6dbi64. 7 PAL G European TV standard65. 7/8 Ratio if the scanning line per minute is 360.66. 75 ohms CATV 67. 76µm In multimode index fiber, what is not a commercial standard size?68. 77 A/W what is the responsivity of silicon APD...400-100069. 85%70. 852 Hz and 1336 Hz DTMF 871. 941 Hz In DTMF, the four vertical frequencies are:

a. 697 Hzb. 770 Hzc. 852 Hz_____

72. A height finder What radar is used to a truncated paraboloid with a phase displacement of 90 degrees?

73. Active Antenna Antenna with built in amplifier74. Allocation A75. Allocation A the broadband PCS that has a frequency of 1850-1865 Mhz76. Allows signal to be

multiplexedThe bandwidth of voice-grade signals on a telephone system is restricted in order to____?

77. Along the length of the line Equally distributed characteristic78. Ambience The accumulation of sounds such as wind, whirl …that can contribute to the

listener’s hears 79. ANISOTROPIC antenna that radiates more energy in one direction rader than the other80. ANSI The sector who developed ASCII81. Antenna 2 has the highest

gainAntenna 1 has a gain of 5.3 dBi, Antena 2 has a gain 4.3 dBd. Which is true?

82. Atm Integration of LANs and WANs83. Audio mixing Yung question parang definition sya ng multiplexing pero you can recognize na

audio mixing yung sagot bec of the word “audio” sa question,,,84. Bandwidth efficiency Used to compare the efficiency and performance of digital modulation technique

to another85. Bandwidth of the tuned

circuitWhat determines the selectivity of a receiver

86. Base Station Controller What does BSC stand for?87. Beamwidth decreases to 1/3

of its value

A satellite dish owner has a 3m dish designed for C band (4 Ghz) operation. The owner wants to use the same dish with a new feedhorn for Ku-band (12 Ghz) satellites. What effect will the change in beamwidth of the antenna?

88. Broadside array An array of simple dipoles fed in phase and having a radiation pattern whose maximum directivity is along the axis normal to the plane of the array

89. Bucky factor ratio of incidence to transmitted radiation through a grid ratio dose of patient with and w/o grid.

90. Bus In satellite system, what is the basic satellite subsystem and structure that support to it?

91. Candela per square meter Unit of luminance is same as 92. Canting Angle…’’RAIN’’93. Capacitor Insulator of 2 wire transmission line94. Channel sensitivity 95. Characteristic impedance When a waveguide is terminated in a resistive load, the load must be matched to96. checksum form of redundancy error checking where each character has a numerical value

assigned to it97. checksum form of redundancy error checking where each character has a numerical value

assigned to it98. Checksum Form of redundancy error checking where each character has a numerical value

assigned to it.99. Class B Which class of FM broadcast station shall have an effective radiated power (ERP)

not exceeding 30 kW?100. Class I Cable Television

Channel101. Class II Cable Television

Channel102. Colometric Electronic device used to measure color of a substance103. Colorimeter An optical electronics device that measures the color concentration of a

substance in a solution104. Coupler combiner What optical coupler has two input ports and one output ports.105. Cross Luminance What causes crawling at dot pattern?106. Data link layer An IOS layer which is responsible for providing error-free communications across

the physical link connecting primary and secondary stations.107. De- emphasis Ckt. Used to return the frequency response to the normal flat level108. decrease the length of the

probe How is loose coupling achieved when using a probe?

109. De-emphasis “Flat”110. designation When firing radar reaches the direction of general target,what mode..?111. D-layer sudden ionosphere disturbance (SID) occurred what layer most affected112. D-layer sudden ionosphere disturbance (SID) occurred what layer most affected113. DVB-C This DVB standard refers to the cable delivery system and is compatible with DVB-

S, and normally used with 8 MHz channels.114. DVB-SI Viewer of the future115. E Most usable ionosphere by amateur

116. E layer Also known as absorption layer117. E. O 454 Transferred the NTC back to the DOTC118. Echo suppressor Used in long distance circuit … to overcome echoes cause by circuit imbalance.119. Economics and Reliability What are the two major factors why virtual private networking is of high interest

among businesses? 120.

EIA/TIA 455 and EIA/TIA 526 document for measuring standard in fiber optics

121. Electrolumenescent display A device which electric field… polycrystaline phospor122. Electrolytic Corrosion produced when two metals are in contact123. Elimination of shadow Advantage, if any, of changing the feedhorn isolator….124. F Most high freq long range comms occurs in what layer of ionosphere?125. Fair In transmission, the conductivity of flat, hilly, loamy soil126. Far end A type of cross talk flavor in Digital Subscriber Line (DSL) that occurs when the

transmitter at one end of the circuit causes problems for the signal received by a receiver at the far end of the circuit is the _______crosstalk.

127. Fast Courier transform Mathematical process in OFDM128. field pattern distortion a circular waveguide is normally used in a rotating joint because Rotating a

rectangular waveguide would cause 129. field pattern distortion a circular waveguide is normally used in a rotating joint because Rotating a

rectangular waveguide would cause130. FIELD STRENGTH METER it measures field strength at a distance from antenna131. Flicker Effect Intermittent….132. Frequency Which of the following factors will affect the outer limits of the skip zone?

-Sunspot Activity-Angle of Transmission- ___________

133. Frequency Translation The change of the modulated carrier frequency from the original RF or the IF of the super heterodyne receiver is known as _____./

134. G/T ratio Measure of figure of merit for satellite135. GIF Image coding technique that is considered loss less up to 256 levels.136. Group velocity is liiltle bit

slowerHow does group velocity of a electromagnetic waveguide differ from the waveguide through free space

137. H and E Two basic types of waveguide T junction.138. Half wave Hertz antenna has a wavelength in relationship with operating frequency139. Heat Resistive load dissipates energy into140. hematologic syndrome radiation dose of 200-1000 rad141. hematologic syndrome radiation dose of 200-1000 rad

142. Hematologic syndrome Radiation doses in the range of approximately 200 to 1000 rad produce.143. High group The horizontal frequency in DTMF are also known as ____ frequency.144. Hounsfield 1st CT scanner145. Hounsfield Who completes the development of first computed tomographic (CT) scanner in

1973?146. increase by 6dBi; increase by

6dBiin a parabolic antenna, doubling the diameter will ______ the gain; doubling the freq. will _____the gain

147. increase by 6dBi; increase by 6dBi

a parabolic antenna, doubling the diameter will ______ the gain; doubling the freq. will _____the gain

148. Increase the gain by 9.54 dB A man has a 3-m dish operating at band C (4GHz). He wishes to use the same dish with a new feed horn operating at Ku (12GHz). What is the beam width with change in frequency?

149. International Mobile What does IMSI stands for?

Subscriber Identification150. International Mobile

Subscriber IdentificationIMSI stands for

151. Ionization of the dense layer Refraction factors of Radio wave are1. Frequency2. Angle of incidence3. _______

152. Isolator Microwave device that allows RF energy to pass through in one direction with very little loss, but absorbs RF power in opposite direction

153. It allows signal to be multiplex

What is the reason why bandwidth voice graded signal use in telephone system?

154. ITU-R BT.601155. J.81 what is the ITU-T recommendation for transmission of videobat 34 Mbps?156. J.81 what is the ITU-T recommendation for transmission of videobat 34 Mbps?157. Joint Technical Committee 1

(JTC 1)Information technical equipment

158. JPEG 24 bit color image159. June 11, 2010160. Just before sunrise Time ionosphere lowest161. latitude and longitude determine the position of satellite 162. latitude and longitude determine the position of satellite163. Linear dipole array Methods of cylindrical164. Longer than “a” dimension Waveguide critical frequency is determined by its dimension and defined as twice

the … wavelength165. Low group The vertical frequencies in DTMF are also known as _____ frequencies.166. Lower group Vertical frequency of DTMF167. Lumped capacitive

resonanceIf the length of the antenna is longer than the wavelength to be used, compensate it

168. Magic T Low power handling capability169. MC 02-06-2010170. Microstrip _____ is a flat conductor separated by an insulating dielectric from a large ground

plane that is usually one-quarter wavelength long.171. Mobile Switching Center What does MSC stand for?172. MODULATION DEPTH determine by the spot diameter of the beam173. multicoupler, coupler, tuner Antenna tuning can be accomplished by:174. Multi-mode 100 Mbps175. NTSC Which TV color system adopt by Philippines?176. NTSC Color TV system adopted by Philippines177. Octave The frequency range where the upper frequency is double the lower frequency.178. Omnidirectional Antennas that transmit an equal amount of energy in the horizontal direction are

called ____.179. P.D. 1096 National Building Code of the Philippines180. Parallel Path Collimating lens, radial short wavelength181. Parallel Resonant Circuit In one quarter wavelength, the short circuit transmission line behaves as

_______.182. Parallel-resonant circuit At exactly one- quarter wavelength, the short circuited transmission line behave

as__183. PAYLOAD Equipment which provides services intended for satellite184. phonocardiograph Records the sound of a heart185. Photoelectric Refers to emission of electron from a clean metallic surface.186. Positive

187. POSITIVE In ionization, the electron has been knocked-off from a neutral gas atom. What is the overall charge of the atom?

188. Power handling capacity If the loop of a loop wire increase, its loop change its___189. Primary Access In ISDN, ______ ……. Common line facility.190. Pulse Position Modulation A series of pulses, in which timing of each pulse represents amplitude of the

information signal at a given time.191. QAM It is more reliable to combine phase and amplitude, this combination is called.192. QAM ….. where digital signal… both amplitude and phase.193. Radiated wave interaction What determines the gain and directivity of a rhombic antenna.194. Radiation195. Radio signals reflecting on

the groundGround effects refer to…

196. RASDL In ASDL197. Refletion The operation of fiber optic cable is based on the principle of198. Reverse Link ______ is transmission from cellular mobile to base station in cellular telephony

system.199. Ring Topology A _______ network requires the message travel around the ring to the desired

destination200. Roentgen Amount of radiation 2.08x10^9 cc201. Rotate 360 degrees Advantage notable in Log- Periodic Antenna202. S Ionosphere disturbance of D layer.203. SCORE The first communications in artificial satellite was accomplished by which of the

following?204. Service and location Determines the specific frequency band.205. sharpness Hard, clashing opposite to quite, calm206. Shunt resistor Microwave iris acts as ___ during resonant frequency.207. signal current For best performance of camera tube, ____ must be in correct level208. Signal detector Pin 21 of RS 232209. Single mode 622 Mbps210. Size, shape, dielectric

materialReflection coefficient can change due to what physical properties

211. Skip zone Zone of silence in wave propagation212. SMB It is a cable connector that provides broadband capability of 4 GHz.213. sphygmomanometer Use in measuring blood pressure214. star In LAN topology, microcomputer and...connected in central computer215. Surface - Emitting LED (SLED) Also known as Burrus LED. Most efficient up to 250 Mbps216. SYSTOLE period during which the heart contact217. Systole The period during which the heart contracts218. tandem office Telephone switches connected to other switches not to individual costumer219. Tandem Office Telephone switch that is only connected to other switches but not to consumers.220. TCM Modulation which combine encoding and modulation to reduce the probability of

error221. TCP Used to established a point to point connection between a network.222. TE Which of the following is also known as H-wave?223. TE 1224. TE wave Other term for H wave225. TE(subscript20) A signal propagated in a waveguide has a full wave of electric intensity change

between two further walls and no component of electric field in direction of propagation

226. TE2 _____ is a device…. with non-ISDN interface, such as... RS232227. Teledesic Most ambitious LEO constellation to date

228. Temporal Masking Auditory system where sounds are hidden229. the widest (height/width) Important specification230. Threshold Effect What is the termed refer as the rapid degradation of output signal quality with

channel induced errors?231. To have a part to be

disassembled during maintenance.

Choke in waveguide is used for what purpose?

232. Transmitted frequency phase relationship

The purpose of the coho lock pulse in MTI radar system is to synchronize the coho and _____.

233.Transport Layer

1. The OSI layer responsible for data tracking as it moves through a network. It controls and ensures the end-to-end integrity of the data message propagated through the network between two devices

234. Tree coupler An optical coupler that has one input port and several output ports.235. trimmer capacitor paralleled with a ganged capasitor236. trimmer capacitor paralleled with a ganged capasitor237. trimmer A small variable capacitance in parallel with each section of ganged capacitor is

called238. TV pickup station Studio to transmitter239. twice Baud rate _____ bandwidth of an ideal channel240. Unwanted Directivity VHF and UHF ….. ship …… in high ….. to prevent ________ of radiation pattern…241. Vertical redundancy

CheckingAn error detection tech. In which a redundant bit is appended to every data unit so that the total number of 1’s in the unit (including parity bit) becomes 0.

242. VHF Sky wave range from 50 to 150 miles.243. Victorscope The phase relationship between I and Q can be displayed by ______244. VLF Earth's surface and layer D act as a waveguide245. Wavelength Important in radio communication246. X In waveguide dimension, critical dimension is?247. Zepp antenna Not designed for 10 mhz