(Last Updated On: December 8, 2017)
This is the Section 5 Module 22 of the compiled Communications Coaching Materials taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.
Communications Engineering Coaching: Section 5 Module 22
QUESTIONS |
ANSWER |
121. Corresponds to a resonant transmission line, and the dipole antennas describe so far have been resonant |
Resonant antenna |
122. Which of the following is referred to as true 3G |
UMTS |
123. Bis means |
Encore |
124. Which of the following causes great damage to the cornea of the eye |
Longer wavelength |
125. Which of the following causes great damage to the retina of the eye |
shorter wavelength |
126. Variation delay form in ATM |
Cell jitter |
127. Embedded overhead bit |
Payload |
128. Commonly used in electro-optic crystal for polarization modulation |
Lithium Niobate |
129. Combination of circular and elliptical orbit |
ELLIPSO |
130. _______ ratio measures accuracy of cell transmission |
Cell error |
131. A coupler consist of series of lenses and partly reflective surfaces |
Beam Splitting Coupler |
132. Major difference of SONET and SDH |
Data rate |
133. Coherence of laser light is important to _______. |
Holography |
134. An optical detector for high sensitivity and bandwidth |
PMT |
135. Same information with dynamic range |
Optical input power |
136. Spectral width of laser in fiber optic |
2nm |
137. Spectral width of LED in fiber optic |
30nm |
138. Typical spectral width of laser ranges from 1nm to ____ |
5nm |
139. Different packet types in X.25 switching |
6 |
140. A single mode fiber optic cable has a diameter of |
0.01 |
141. A step index multimode fiber optic cable has a diameter of |
0.02 |
142. Packet switching |
Layer 3 |
143. Thickness of optical disk |
5mils |
144. Used in 3D,.form depth video signal |
Anti-logarithmic amplifier |
145. Which of the following is not a fiber optic loss |
Reflection |
146. Diameter of VSAT is between 0.3m to _______ |
0.9m |
147. Morning primetime block for AM in Metro Manila |
5am to 9am |
148. Parameter determines the range or the spectral length |
Spectral response |
149. Refers to variety of value added features |
Control Information |
150. Refers to mobile station identifier sent over on the air interface |
Temporary Mobile Station Identifier |
151. White streak |
Blip |
152. 16 bit network number (IP Addressing) |
Class B |
153. Illuminates only small portion of the fiber core |
Effective Modal Bandwidth |
154. National Building Code |
PD 1096 |
155. Completely fills the core and the cladding of the front end of the fiber. |
Overfilled launched bandwidth |
156. Helium laser was discovered by A. Javen in |
1960 |
157. Ratio of the speed of air and the speed of another substance |
Index of refraction |
158. Number of electrons emitted per second times the electron charge |
Photocurrent |
159. Integration of video, data in high speed |
Fast Packet Concept |
160. Laser light is bright mainly because it is |
coherent |
161. Angle separation of 8PSK |
45O |
162. Wavelength dependence index of refraction |
Modal Dispersion |
163. An episode used to give sample of the style of a writer? |
Pilot |
164. The Bandwidth of a fiber is limited to |
Dispersion |
165. The loudness of a sound depends upon the energy of motion imparted to ____________ molecules of the medium transmitting the sound. |
vibrating |
166. What alloy is formed using Iron, aluminum and silicon used as videoheads in video recording tapes |
Alfecon |
167. A technique used in transmitting multiple copies of information over the network to avoid deep fade |
Diversity |
168. In KBP television broadcasting, the commercial payload for a station should not exceed ________ minutes in Metro Manila |
18 |
169. In KBP television broadcasting, each station should allot ____ minutes of newscast (local or foreign) from Monday to Friday |
30 |
170. In acoustics, it is a sequential musical note |
Tempo |
171. The harmonically related carrier (HRC) shifts all cable channels 2 to 125 down to frequency -1.25 MHz are done to what channel pairs? |
3-4, 5-6, 4-6 |
172. The OSI layer responsible for network availability, data storage and process capacity |
Session Layer |
173. A type of error of which two or more data units have changed |
Burst Error |
174. Which of the following is/are true about Spectrum Management? |
It performs forward error correction; It provides automatic congestion control in the upstream direction; It performs upstream frequency agility to avoid igress in noise |
175. The time it takes for the intensity of sound energy in the room to drop to one millionth of its initial value |
Reverberation time |
176. The persistence of sound even after a sound reflection occurred |
Reverberation |
177. Which of the following is true about Consumer DSL |
It has a data rate of 176 kbps in the upward direction; It has a data rate of 1Mbps in the downward direction; It has lower speech communication capability |
178. In an empty GSM timeslot or certain timeslot, data service is sent to the direction of packet switch data over what GSM network |
GPRS |
179. There are _________ primary unshielded twisted pair cables as classified by EIA/TIA 568 standard |
7 |
Dead Zone |
|
181. Is a modulation / multiplexing technique wherein the information and sidebands are distributed over very wide bandwidth |
Spread Spectrum |
182. Which of the following is true about UMTS? |
The ITU-T named it IMT2000; Has packet data service; Has initial speed of 28.8 kbps |
183. What modulation technique is used by GSM? |
Frequency Hopping |
184. A system which has access to all individual users of the entire network |
Server |
185. A system which contains shared files to all individual users |
Servers |
186. A single transmission path from transmitter to receiver in the direction of line of sight range |
Hop |
187. A fixed cell length is how many bytes |
53 bytes |
188. Which of the following materials is sensitive to light? |
Photoresist |
189. A loss incurred of an electromagnetic wave travelling in a straight direction in a vacuum without absorption or reflection of medium of nearby objects |
Free Space Path loss |
190. An executive order regulating the operation of cable antenna television systems in the Philippines, and for other purposes |
EO 205 |
191. An executive order which grants the NTC jurisdiction, control and regulation over the Philippine Commercial Satellite Corporation. |
EO 196 |
192. A type of fiber optic cable which is always tightly buffered. |
Plastic Clad Silica |
193. It states that light wave behaves as if it is consists of many tiny particles |
Quantum Theory |
194. The highest central office in the DDD network |
Regional Center |
195. When a photodiode is used as fiber optic detector, it must be |
Reversed bias |
196. A diode used as an optical transmitter in fiber optics communication system |
APD |
197. From mobile station to base station |
Reverse Link |
198. Refers to the number of electrons emitted per second, times the electron charge |
Photocurrent |
199. A portion of the geosynchronous orbit where optimum coverage of a country is known as __________ location |
Arc of Good |
200. A geosynchronous satellite must be positioned at _______ |
0 degrees latitude |
201. How many polar satellites are needed to complete one revolution |
1 |
202. A licensed ECE is needed if a station transmit power exceeds? |
3kW |
Conduit |
|
204. For a music lover concert “A” is 440 Hz, if a musical note one octave higher were played, it would be ____ that frequency |
Double |
205. In a 220 Hz tone, an octave lower will result to ________? |
110Hz |
206. The digital signal level __ uses binary line coding scheme |
1 |
207. Voice channels are also known as |
Traffic channel |
208. Connects to other offices and does not go directly to subscribers |
Tandem Office |
209. In a telephone channel bandwidth of 300 to 3000 Hz, the highest theoretical bandwidth rate is |
5400 bps |
210. With 8-bit processing, how many elements are contained in the channel? |
2048 ports |
211. What happens to the frequency and wavelength of a material if it enters from one medium to another type of medium with a change in speed? |
The frequency remains the same but the wavelength changes |
212. The main benefit of light-wave communications over microwaves or any other communications media |
Wider bandwidth |
213. Microwave communications is used in frequencies above? |
1GHz |
214. Waveguide becomes compulsory above what frequencies? |
3GHz |
215. It refers to an electromagnetic wave of which it is contained in a conduit |
Guided Transmission Medium |
216. What is the average loss in fiber splice? |
0.15 dB |
217. Is the sound energy per unit area at right angles of the propagation direction per unit time |
Sound Intensity |
218. Octave A ratio of two frequencies at |
2:1 |
219. Pin 21 in the RS 232 Interface D connection |
Signal Quality detector |
220. An additional noise attributed to wind and environmental noise |
Ambience |
221. Refers to the direction of the electric field vector in space |
Polarization |
222. Is an antenna array which is highly directional at right angles to the plane of the array |
Broadside Array |
223. The transmission of information from multiple sources occurring on the same facility but not at the same time |
TDM |
224. The most widely used fax standard |
Group III |
63, 535 octets |
|
226. The highest layer in the ISO protocol Hierarchy |
Application Layer |
227. Is a non-coherent light source fo optical communications system |
LED |
228. Which of the following is used as an optical receiver in fiber optics communications |
APD |
229. Is the result of photons of light that are absorbed by the atoms of the glass core molecules |
Infrared Absorption |
230. What parameter of light detector determines the range or system length that can be achieved for a given wavelength? |
Spectral Response |
231. Dark current in light detectors is caused by? |
Thermally generated carriers in the diode |
232. What is the typical wavelength of light emitted from epitaxially grown LEDs? |
940 nm |
233. Which is not a possible cause of fiber optic loss? |
Stepped Index Operation |
234. When light strikes a flat polished end of a fiber, it produces a loss of? |
4% |
235. An increase in light intensity produces fast optic switching due to? |
Amplification of optical signal |
236. Optical fibers for telecommunications are typically about ___ mils thick and consist of a glass core, a glass cladding of lower index of refraction, and a protective coating |
5 |
237. Material dispersion is caused by the? |
Wavelength dependence of the index of refraction |
238. One of the following is not a solid state optical detector? |
PMT |
239. Which optical detector is used when high sensitivity and bandwidth are required? |
PMT |
240. A radio station has a _ years of legal operation and shall renew for the same duration of operation |
15 |
Complete List of Communications Engineering Coaching Materials
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