MCQs in Wire and Wireless Communications System Part XI

(Last Updated On: September 10, 2019)

MCQs in Wire and Wireless Communications - Part XI

This is the Multiples Choice Questions Part 11 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 11: MCQs from Number 501 – 550                Answer key: PART XI

Continue Practice Exam Test Questions Part XI of the Series

501. A telephone service that uses a common 800 area code regardless of the location of the destination.

  • A. wide area telephone service
  • B. local area telephone service
  • C. metropolitan area telephone service
  • D. personal area telephone service

502. A device that combines the transmitter and the receiver to operate over the same wire pair.

  • A. balancing network
  • B. diaphragm
  • C. hybrid
  • D. relay

503. Group 2 fax that uses fax standard is

  • A. SSB
  • B. FSK
  • C. Vestigial sideband AM
  • D. PSK

504. A signal sent from the central office to a subscriber whenever there is an incoming call

  • A. busy signal
  • B. ringing signal
  • C. ringback signal
  • D. dial tone

505. It is defined as the optimum level of a test tone on a channel at some point in a communications system.

  • A. transmission level point
  • B. data level point
  • C. voice level point
  • D. baseband transmission point

506. A type of crosstalk which is caused by inadequate control of the frequency response of the transmission system, poor filter design, or poor filter performance.

  • A. single-channel crosstalk
  • B. transmittance crosstalk
  • C. linear crosstalk
  • D. coupling crosstalk

507. Class of switching office that could provide service to geographical regions varying in size from part of the state to all of several states, depending on population density.

  • A. sectional center
  • B. end office
  • C. regional center
  • D. toll center

508. By definition, speech power is equal to v.u. reading minus 1.4 dB plus log of N, where N is

  • A. The number of lines used
  • B. The number of transmitters used
  • C. The number of persons speaking
  • D. The number of listeners listening

509. The most commonly used light sensor in a modern fax machine is a

  • A. Phototube
  • B. Phototransistor
  • C. Liquid-crystal display
  • D. Charged coupled device

510. Systems that are simplex wireless communications systems designed to alert subscribers of awaiting messages

  • A. paging
  • B. searching
  • C. texting
  • D. calling

511. It can be defined as any disturbance created in a communications channel by signals in other communications channel.

  • A. crosstalk
  • B. interference
  • C. hits
  • D. jitter

512. Type of Class 4 toll center which provides human operators for both outward and inward calling service.

  • A. Class 4P
  • B. Class 5
  • C. Class 4C
  • D. Class 1

513. A type of signaling was developed as an alternative to loop signaling.

  • A. ear and mouth
  • B. duplex
  • C. loop pulsing
  • D. interoffice calling

514. Signals that provide the routing information, such as calling and called numbers.

  • A. routing
  • B. calling
  • C. controlling
  • D. addressing

515. Phase jitters occur at what frequency?

  • A. less than 300 Hz
  • B. more than 300 Hz
  • C. more than 400 Hz
  • D. more than 300 Hz but less than 400 Hz

516. 10 or more subscribers connected in a central office exchange using same local loop

  • A. wire tapping
  • B. party lines
  • C. eaves dropping lines
  • D. monitor lines

517. He designed and built the first transmitter and receiver for a telephone set.

  • A. Alexander Graham Bell
  • B. Alexander Bain
  • C. Antonio Meucci
  • D. Philipp Reis

518. If a switching machine is set to accept pulses at a rate of 10 pulses per second with a 60% break, find the make interval of the switch.

  • A. 60 ms
  • B. 100 ms
  • C. 40 ms
  • D. 25 ms

519. How many point-to-point links are required to connect 50 telephones together?

  • A. 2255
  • B. 1225
  • C. 2250
  • D. 1552

520. The first commercial switchboard was installed in

  • A. Connecticut
  • B. Boston
  • C. Pennsylvania
  • D. Washington

521. Where is a fax scanner found?

  • A. at the end of fax signals
  • B. at origin of fax signals
  • C. at receive end of fax system
  • D. at the input of a fax transmitter

522. What is the standard scanning LPI rates?

  • A. 120
  • B. 25
  • C. 400
  • D. 195

523. What tone is used to start fax?

  • A. 400 Hz
  • B. 100 Hz
  • C. 300 Hz
  • D. 500 Hz

524. What tone is used to stop fax?

  • A. 450 Hz
  • B. 500 Hz
  • C. 150 Hz
  • D. 250 Hz

525. What tones carry map information using facsimile?

  • A. 1300 Hz and 2400 Hz
  • B. 2400 Hz and 2500 Hz
  • C. 1200 Hz and 2400 Hz
  • D. 1500 Hz and 2300 Hz

526. The following frequencies are developed using 1.8 kHz used for scanner in facsimile, except:

  • A. 300 Hz
  • B. 100 Hz
  • C. 450 Hz
  • D. 60 Hz

527. To what is the output of a scanner fed in fax?

  • A. transmitter
  • B. receiver
  • C. mixer
  • D. oscillator

528. Basically, in facsimile, what is a scanner helix?

  • A. clear sided drum with one turn scratch
  • B. clear sided drum with two turn scratch
  • C. opaque sided drum with one turn scratch
  • D. opaque sided drum with two turn scratch

529. A recorder helix in facsimile?

  • A. insulated drum with one turn wire
  • B. opaque drum with one turn scratch
  • C. clear sided with one turn wire
  • D. insulated drum with one turn scratch

530. In fax, the following are scanner signals where the switcher switch in except:

  • A. 300 Hz
  • B. phasing signal
  • C. 90 Hz
  • D. map signals

531. With what type transmitter is fax transmitted on HF?

  • A. AM
  • B. FM
  • C. PM
  • D. SSB

532. With what type transmitter is fax transmitted on VHF?

  • A. FM
  • B. PM
  • C. SSB
  • D. AM

533. The helix wire forms one end of the circuit of facsimile; what forms the other?

  • A. insulated wire
  • B. drum
  • C. blade
  • D. transmit circuit

534. What emf is required across the circuit in facsimile to form a dark spot?

  • A. 40 V
  • B. 60 V
  • C. 25 V
  • D. 70 V

535. In a facsimile recorder what is used to make 1,500-Hz ac stronger than 2300 Hz?

  • A. non-linear slope filter
  • B. linear slope filter
  • C. active slope filter
  • D. passive slope filter

536. In a recorder of facsimile, what is used to generate 60-Hz ac?

  • A. 3.0 kHz oscillator and logic gates
  • B. 2.4 kHz mixer and logic gates
  • C. 3.0 kHz oscillator and logic divider
  • D. 2.4 kHz oscillator and logic divider

537. If the tuning meter reads full scale, what would this indicate in facsimile?

  • A. 1300 signal
  • B. 2400 signal
  • C. 1400 signal
  • D. 1500 signal

538. If the tuning meter reads midscale, what would this indicate in facsimile?

  • A. average
  • B. mistuned
  • C. peak
  • D. minimum

539. If the tuning meter reads low-scale, what would this indicate in facsimile?

  • A. 1500 signal
  • B. 1700 signal
  • C. 2300 signal
  • D. 2400 signal

540. Why is the blade an endless loop in facsimile?

  • A. wears faster
  • B. wears slower
  • C. wears average speed
  • D. never wears

541. What should bring the left margin of the map to the left side of the paper in the recorder of facsimile?

  • A. map signals
  • B. phasing signals
  • C. automatic switch
  • D. 90 Hz

542. The signal heard on the telephone line that indicates readiness of the central office in receiving address or telephone number.

  • a. Dial tone
  • b. Ringing tone
  • c. Busy tone
  • d. Congestion tone

543. The signal heard on the telephone line which indicates that the called subscriber set is in use.

  • a. Dial tone
  • b. Ringing tone
  • c. Busy tone
  • d. Congestion tone

544. BORSCHT stands for

  • a. Battery, over-voltage protection, ringing, supervision, coding, hybrid and testing
  • b. Battery, over-hook regulator, ringing, surge protect, circuit, hybrid and test
  • c. Name of the leading manufacturer of telephone system
  • d. Acronym for the developers of computer

545. Request for service from the telephone is detected at the Central Office as

  • a. Dial pulses
  • b. Ringing signal
  • c. Flow of loop current
  • d. Battery reversal

546. The location where all subscriber lines are terminated and switching equipment facility is installed.

  • a. Central office
  • b. Toll office
  • c. Gate way
  • d. Tandem

547. A private line communications channel of the type provided by communication common carrier for linking two or more points together.

  • a. Party line
  • b. Tie line
  • c. DID line
  • d. Trunk line

548. The attenuation loss limit of the subscriber loop is set at 6 dB. What is the maximum length if a 26H88 loading coil with an attenuation of 0.80 dB per kilometer is added?

  • a. 1.5 km
  • b. 3.5 km
  • c. 5.5 km
  • d. 7.5 km

549. The first number of the loaded cable designation 19H44 indicates

  • a. Spacing
  • b. Coil inductance
  • c. Wire gauge
  • d. Attenuation

550. The letter of the loaded cable designation 24B88 indicates

  • a. Spacing
  • b. Coil inductance
  • c. Wire gauge
  • d. Attenuation

Complete List of MCQs in Communications Engineering per topic

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