MCQs in Wire and Wireless Communications System Part X

Compiled MCQs in Wire and Wireless Communications System Part 10 of the series as one topic in Electronic System and Technologies (Communications Engineering) in the ECE Board Exam.

MCQs in Wire and Wireless Communications - Part X

This is the Multiples Choice Questions Part 10 of the Series in Wire and Wireless Communications System as one of the Communications Engineering topic. 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 but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

Online Questions and Answers Topic Outline

  • MCQs in Mobile Communications
  • MCQs in Cellular Communication
  • MCQs in Trunk Radio
  • MCQs in Radio Paging System
  • MCQs in Facsimile
  • MCQs in Telephone Set
  • MCQs in Signaling
  • MCQs in Transmission Considerations in long distance network
  • MCQs in Insertion Loss
  • MCQs in VF Repeaters
  • MCQs in Traffic Calculations
  • MCQs in Reference Equivalent and Standards
  • MCQs in Telephone Networks
  • MCQs in Billing
  • MCQs in Network Hierarchy and Class type
  • MCQs in Connection and Performance of Wire and Wireless Communications

MCQs in Wire and Wireless Communications System Series

Following is the list of multiple choice questions in this brand new series:

Wire and Wireless Communications MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII
PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII
PART 9: MCQs from Number 401 – 450                 Answer key: PART IX
PART 10: MCQs from Number 451 – 500                Answer key: PART X

Continue Practice Exam Test Questions Part X of the Series

451. The class of switching office that provides service to small groups of class 4 offices within a small area of state.

  • A. Class 1
  • B. Class 4
  • C. Class 2
  • D. Class 3

452. A device used to measure speech volume

  • A. volume unit meter
  • B. volume milliammeter
  • C. volume pulse meter
  • D. volume intensity meter

453. The communications between two or three central offices is called

  • A. interoffice link
  • B. trunk
  • C. interoffice calling
  • D. loop

454. In telephony, the -48V dc voltage was used rather than ac voltages because

  • A. to prevent power supply hum
  • B. to allow service to continue in the event of power outage
  • C. because people are afraid of ac
  • D. all of these

455. Category of signaling message that indicates a request of service, such as going off-hook or ringing in the destination telephone

  • A. dial tone
  • B. signaling
  • C. supervising
  • D. alerting

456. Occurs in coherent SSBSC systems, such as those using frequency division multiplexing when the received carrier is not reinserted with the exact phase relationship to the received signal as the transmit carrier possessed.

  • A. phase delay distortion
  • B. phase jitter distortion
  • C. phase intercept distortion
  • D. all of these

457. It is simply the dedicated cable facility used to connect an instrument at a subscriber’s station to the closest telephone office.

  • A. subscriber lines
  • B. local loops
  • C. subscriber loops
  • D. any of these

458. A telephone call completed within a single local exchange is called

  • A. intraoffice call
  • B. intraexchange call
  • C. intraswitch call
  • D. any of these

459. Type of Class 4 toll center usually had only outward operator service or perhaps no operator service at all.

  • A. Class 2
  • B. Class 4P
  • C. Class 1
  • D. Class 3

460. In a 4-wire telephone set connection, (used to connect telephone set to office central switching) the yellow coded wire is used _______________.

  • A. as ground wire
  • B. to transmit the signal
  • C. to receive the signal from the far end
  • D. as a spare or for special purpose applications

461. When the image at the receiving end of a facsimile transmission us elongated horizontally,

  • A. the transmitter IOC is less than the receiver IOC
  • B. the transmitter IOC is greater than the receiver IOC
  • C. the transmitter IOC is equal to the receiver IOC
  • D. the IOC is not a factor

462. It is a special balanced transformer used to convert a two-wire circuit into a four-wire circuit and vice-versa.

  • A. equalizer circuit
  • B. balanced transformer
  • C. balanced modulator
  • D. hybrid network

463. It is a method originally used to transfer digits in the telephone set to the local switch.

  • A. tone dialing
  • B. dial pulsing
  • C. battery and ground pulsing
  • D. reverse battery pulsing

464. It is the time required to propagate a change in an AM envelope through a transmission medium

  • A. envelope delay distortion
  • B. phase delay
  • C. envelope delay
  • D. propagation time

465. It is the primary source of transmission errors in data circuits

  • A. impulse noise
  • B. crosstalk
  • C. gain hits
  • D. interference

466. It eliminates the echo by electrically subtracting it from the original signal rather than disabling the amplifier in the return circuit.

  • A. echo suppressors
  • B. echo limiters
  • C. echo cancellers
  • D. any of these

467. In telephony, functions that involve the actual transmission of a subscriber’s messages and any necessary control signals.

  • A. transmission functions
  • B. signaling functions
  • C. maintenance functions
  • D. calling functions

468. 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

469. It is an exchange without a local loops connected to it

  • A. double office
  • B. tandem office
  • C. exchange office
  • D. local office

470. The 5-class switching hierarchy is a __________ scheme that establishes an end-to-end route mainly through trial and error.

  • A. interleaved switching
  • B. progressive switching
  • C. point-to-point switching
  • D. step-by-step switching

471. The frequency range of maximum voice energy is between

  • A. 150 and 300 Hz
  • B. 300 and 3400 Hz
  • C. 250 and 500 Hz
  • D. 100 and 300 Hz

472. The oldest of the automatic switching system

  • A. manual switching
  • B. step-by-step
  • C. common control
  • D. Electronic

473. Group 3 fax used which modulation?

  • A. QAM
  • B. FSK
  • C. Vestigial sideband AM
  • D. FM

474. Signals that provides information in the form of announcements, such as number changed to another number, a number no longer in service, and so on

  • A. addressing
  • B. ringing
  • C. controlling
  • D. supervising

475. The switch closure in an off-hook condition causes a range of dc current to flow on the loop, what is that range of current?

  • A. 23 mA to 50 mA
  • B. 15 mA to 30 mA
  • C. 10 mA to 20 mA
  • D. 20 mA to 80 mA

476. These are unused sections of cables that are connected in shunt working cable pair, such as a local loop. They are used for party lines to connect to the same local loop.

  • A. cross-connect loop
  • B. drop wire tap
  • C. bridge tap
  • D. wire tap

477. The time delay encountered by a signal as it propagates from a source to a destination is called ____________.

  • A. propagation time
  • B. phase delay
  • C. holding time
  • D. system delay time

478. It is the decrease in gain of more than 12 dB lasting longer than 4 ms and is a characteristics of temporary open circuit conditions and are generally caused by deep fades in radio facilities or by switching delays.

  • A. echo
  • B. jitter
  • C. gain hits
  • D. dropouts

479. It is similar to the local loop except that it is used to interconnect two telephone offices.

  • A. trunk lines
  • B. subscriber loop
  • C. local lines
  • D. subscriber lines

480. Calls that are placed between two stations that are connected to different local exchanges.

  • A. interoffice calls
  • B. interswitch calls
  • C. interexchange calls
  • D. any of these

481. _________ is defined as a momentary on-hook condition that causes loop making and breaking from the telephone set dialer toward the central office.

  • A. dial tone
  • B. dial pulsing
  • C. on-hook
  • D. off-hook

482. In facsimile technology, it is a number derived from the width-height ratio.

  • A. numerical aperture
  • B. scanning spot
  • C. index of cooperation
  • D. cut-off frequency

483. In RJ-11, the RJ stands for

  • A. Recommended Jack
  • B. Released Jack
  • C. Registered Jack
  • D. Radio Jack

484. A cross-connect point used to distribute the larger feeder cable into smaller distribution cables

  • A. SLIC
  • B. serving area interface
  • C. LATA
  • D. cross-connect cabinet

485. The process used to improve a basic telephone channel is called

  • A. line turnaround
  • B. line conditioning
  • C. line sensing
  • D. line improvement

486. In telephony, functions that identify and connect subscribers to a suitable transmission path

  • A. transmission functions
  • B. signaling functions
  • C. switching functions
  • D. calling functions

487. The telephone switching plan that allows a certain degree of route selection when establishing a phone call.

  • A. NPA
  • B. switching hierarchy
  • C. toll hierarchy
  • D. interoffice hierarchy

488. It provides access to the SS7 network access to databases used by switches inside and outside of the network, and transfer of SS7 messages to other signaling points within the network.

  • A. point codes
  • B. signaling points
  • C. service points
  • D. switching points

489. The connection between the subscriber and his own particular central office.

  • A. trunk
  • B. line
  • C. signaling
  • D. pulsing

490. It is a measure of how well we can distinguish closely spaced objects or identify small items on a print.

  • A. resolution
  • B. legibility
  • C. contrast
  • D. hue

491. It is the exchange of signaling messages over local loops between stations and telephone company switching machines

  • A. loop signaling
  • B. station signaling
  • C. interoffice signaling
  • D. pulse signaling

492. Modern paging system uses what modulation technique?

  • A. FSK and QPSK
  • B. PSK and QAM
  • C. ASK and FSK
  • D. FSK and PSK

493. The talker hears a returned portion of the signal as an echo, what is the round-trip time of delay for an echo to quite annoying?

  • A. 15 msec
  • B. 25 msec
  • C. 35 msec
  • D. 45 msec

494. When subscriber initiates a long distance calls, the local exchange connects the caller to the toll office through a facility called ________.

  • A. interoffice toll trunk
  • B. intraoffice toll trunk
  • C. interoffice exchange trunk
  • D. intraoffice exchange trunk

495. Range of speech power

  • A. 100 – 1000 µW
  • B. 10 – 100 µW
  • C. 10 – 1000 µW
  • D. 1000 – 10000 µW

496. Which resolution produces the best quality fax?

  • A. 96 lpi
  • B. 150 lpi
  • C. 200 lpi
  • D. 400 lpi

497. Facsimile standards are set by the

  • A. FCC
  • B. DOD
  • C. CCITT
  • D. IEEE

498. Telephone set component placed directly across the tip and ring to alert the designation party of an incoming call

  • A. transmitter
  • B. receiver
  • C. ringer
  • D. dialer

499. The reference frequency of a typical voice-band circuit is typically around _________.

  • A. 1500 Hz
  • B. 1300 Hz
  • C. 1700 Hz
  • D. 1800 Hz

500. The most versatile and popular crossbar switch was __________.

  • A. #4YB
  • B. 5#YB
  • C. #5XB
  • D. #5ZB

Complete List of MCQs in Communications Engineering per topic


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