This is the Miscellaneous Multiples Choice Questions Part 5 of the Series in Communications Engineering. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in Communications Engineering field (Electronics Systems and Technologies). In the actual board, you have to answer 100 items in Electronic Systems and Technologies within 5 hours. You have to get at least 70% to pass the subject. Electronic Systems and Technologies is 30% of the total 100% Board Rating along with Mathematics (20%), General Engineering and Applied Sciences (20%) and Electronics Engineering (30%).
Practice Exam Test Questions
Following is the list of multiple choice questions in this brand new series:
Continue with Part V of the Series
Choose the letter of the best answer in each questions.
201. A traffic class in UMTS applications that includes the request-response type of 2-way communications processes between machines and humans such as Web browsing, database retrieval and server access.
- a. conversational class
- b. streaming class
- c. interactive class
- d. background class
202. The method used for measuring the phase drift between the radio frequency of the master signal and that of the same signal in LORAN-C.
- a. ground matching
- b. hyperbolic matching
- c. vertical matching
- d. cyclic matching
203. What is the overhead (number of extra bits) in the DS-3 service?
- a. 1.368 Mbps
- b. 1.480 Mbps
- c. 2.048 Mbps
- d. 6.024 Mbps
204. Noise when measured across the tip and ring terminals of a network shall be ____ dBrnCO.
- a. 15
- b. 16
- c. 17
- d. 18
205. The name given for a set of standards for communicating among computers in which the primary purpose is to serve as a structural guideline for exchanging information between computers, workstations and networks.
- a. OSI
- b. TCP/IP
- c. Owen bridge
- d. LAN
206. How long does it take to dial the number 781-1225 using pulse dialing with 0.5s inter-digit time?
- a. 5.6s
- b. 7.2s
- c. 6.8s
- d. 12.5s
207. A loudspeaker produces an SPL of 85dB-SPL at 1 meter distance and input electrical power of 1W. How loud is the SPL at the distance of 20 meters if this speaker is driven to 20W of electrical power?
- a. 82 dB-SPL
- b. 72 dB-SPL
- c. 69 dB-SPL
- d. 79 dB-SPL
208. For Group I facsimile, the CCITT frequencies used are ____ Hz for white and _____ Hz for black.
- a. 1500,2200
- b. 1300,2300
- c. 1500,2400
- d. 1500,2300
209. A loudspeaker has an acoustic power of 1mW if the electrical power is 10W. What is the rated efficiency?
- a. 40dB
- b. -50dB
- c. 50 dB
- d. -40dB
210. One of the following is not a primary type of Hybrid data used to combine digitally encoded signals with FDM signal and transmit them as one composite baseband signal.
- a. DIV
- b. DVD
- c. DTV
- d. DAVID
211. The minimum illumination recommended for reading is ____ lux.
- a. 800
- b. 850
- c. 900
- d. 950
212. It is a standard designed by ITU to allow telephones in the public telephone network to talk to computers/terminals connected to the Internet.
- a. H.111
- b. H.123
- c. H.321
- d. H.323
213. The _____ provides the mathematical representation for using a Gaussian process as a model for a large number of different physical phenomena in which the random variable, at a particular instant of time, is the result of a large number of individual random events.
- a. Gaussian Theorem
- b. Central Limit Theorem
- c. Poisson Distribution
- d. Gaussian Distribution
214. The speed of sequence of musical notes is called:
- a. Pitch
- b. Tempo
- c. Timbre
- d. Musical Instrument Digital Interface
215. Asynchronous transmission has low-speed transmission of less than ___ kbps.
- a. 2.4
- b. 3.8
- c. 1.2
- d. 5.6
216. Defines the rules of the conversation the message passing among the network users.
- a. network protocol
- b. Internet protocol
- c. Data
- d. Information protocol
217. In acoustics, the optimum reverberation of a recording studio is in the range of ____ seconds.
- a. 1.3 to 1.6
- b. 0.45 to 0.55
- c. 2.4 to 3
- d. 0 to 0.1
218. What is the color TV system adopted by the Philippines?
- a. NTSC
- b. PAL
- c. SECAM
- d. none of the above
219. A loud speaker cabinet has an internal volume of 5,184 cubic in(84,950 cubic cm). It has a port area on the baffle of 50 squares in (323 square cm) and a thickness of 0.75 in (19mm). What is the Helmholtz resonance in Hertz, of this loud speaker enclosure.
- a. 250 Hz
- b. 245 Hz
- c. 240 Hz
- d. 255 Hz
220. The full IEEE 1394b specifically supports connections up to 100 meters in length. It also supports data rates up to ___.
- a. 2.4 Gbps
- b. 100 Mbps
- c. 1 Gbps
- d. 3.2 Gbps
221. In the IS-95 A cellular service, the base station transmit frequency is ___ above the mobile station transmit frequency.
- a. 65 MHz
- b. 60 MHz
- c. 50 MHz
- d. 45 MHz
222. A computer monitor has a resolution of 1280 by 1024 pixels. If each pixel uses 1024 colors, how many bits are needed to send the complete contents of a screen?
- a. 12 Gigabits
- b. 1.3 Gigabits
- c. 12 Megabits
- d. 13.1 Megabits
223. A set of communication facilities allowing direct access to 64 kbps data streams (or multiples of) for drop and insert. A form of cell relay, supports B-ISDN.
- a. Broadband ISDN
- b. Asynchronous Transfer Mode
- c. LAN topology
- d. Ethernet
224. The approximate sound pressure level of a normal conversation is ______
- a. 30dB
- b. 60 dB
- c. 80 dB
- d. 100 dB
225. What component in the telephone set has the primary functions of compensating for the local loop length?
- a. Varistor
- b. induction coil
- c. potentiometer
- d. transformer
226. What is the commonly used telephone wire?
- a. AWG #22
- b. AWG#20
- c. AWG#19
- d. AWG#23
227. As per Philippine standard, frequency allocation of AM Radio Broadcast is from ____.
- a. 535 to 1605KHz
- b. 526.5 to 1605KHz
- c. 535 to 1705 KHz
- d. 526.5 to 1705 KHz
228. Exact value of color subcarrier frequency (MHz) is ______.
- a. 3.579554
- b. 3.579455
- c. 3.580545
- d. 3.579545
229. In the KBP TV code, a fine of ____ pesos is imposed on a violation for SEX, OBSCENITY and VIOLENCE.
- a. P1000
- b. P7000
- c. P2000
- d. P6000
230. The first computer-controlled central office switching system used in PSTN.
- a. No.7 ESS
- b. No.2 ESS
- c. No.5 ESS
- d. No.1 ESS
231. The CCITT structure has a number of study groups that provide the work classification or specialization for developing the recommendations. The CCITT has ___ study groups.
- a. 14
- b. 15
- c. 16
- d. 17
232. An error detection method which uses one’s complement arithmetic.
- a. Checksum
- b. CRC
- c. Simple-parity check
- d. Two-dimensional parity check
233. The channel capacity of a 6KHz bandwidth binary system is ___ bits/s. Assuming no noise.
- a. 1,000
- b. 2,100
- c. 10,000
- d. 12,000
234. Also known as pin 21 of RS-232 interface on D connector, this connection allows signals to be transmitted from the DCE to the attached DTE whenever there is a high probability of an error in the received data due to the quality of the circuit falling below a predefined level.
- a. DCE transmitter signal element timing
- b. color quality selector
- c. signal quality detector
- d. DTE transmitter signal element timing
235. Interoperable LAN Security standard.
- a. 802.13
- b. 802.9
- c. 802.7
- d. 802.10
236. The typical amount of voltage in dc used in the battery of the central office with respect to ground.
- a. -48
- b. +72
- c. +48
- d. -72
237. What protocol uses the checksum method of error-detection?
- a. Y modem
- b. Z modem
- c. X modem
- d. V modem
238. Determine the visual carrier frequency of TV channel 19
- a. 507.25 MHz
- b. 501.25 MHz
- c. 471.25 MHz
- d. 495.25 MHz
239. In telecommunications, the acronym NAM stands for ______.
- a. Non Alterable Memory
- b. Numeric Assignment Module
- c. Numbered Access Module
- d. Number Allocation Manager
240. A cable type used in CCTV system that has a maximum run length of 250m.
- a. URM-50
- b. URM-80
- c. URM-90
- d. URM-70
241. In cellular telephony, a burst lasts approximately ___ microseconds?
- a. 0.577
- b. 477
- c. 577
- d. 0.477
242. What is a typical distance by a LAN using Ethernet?
- a. 500 to 2500 km
- b. 10 to 1000km
- c. 500 to 2500 m
- d. 10 to 1000m
243. Determine the peak frequency deviation for a binary FSK signal with a mark frequency of 63 kHz, space frequency of 75kHz and an input bit rate of 2kbps.
- a. 6 KHz
- b. 7 KHz
- c. 9 KHz
- d. 8 KHz
244. How many central office allotted for each exchange?
- a. 2
- b. 1
- c. 3
- d. 5
245. In an S/N circuit, the time that it must hold the sampled voltage is:
- a. Aperture time
- b. Acquistion time
- c. Flat-top time
- d. Dmin
246. Part of broadcasting in a day that refers to that period of time between 1000 UTC to 2200 UTC. UTC stands for Universal Time Coordinates.
- a. Daytime period
- b. Nighttime period
- c. Experimental period
- d. primetime period
247. An AM broadcast service area in which ground wave field of 1mV/m (60dBu) is not subject to objectionable interference of objectionable fading.
- a. primary service area
- b. secondary service area
- c. intermittent service area
- d. none among these
248. What is the maximum allowable ERP for channels 7-13 in Metro Manila and Metro Cebu?
- a. 100 KW
- b. 316 KW
- c. 350 KW
- d. 1 MW
249. The most versatile and popular crossbar switch was ____.
- a. #4YB
- b. #5YB
- c. #5XB
- d. #5ZB
250. When watching TV programs, considering the NTSC standard receiver, the best viewing distance from TV screen is about ___ times the picture tube height.
- a. 10 - 20
- b. 100 - 20
- c. 50 - 60
- d. 4 - 8
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