MCQs in Wire and Wireless Communications System Part IX

Compiled MCQs in Wire and Wireless Communications System Part 9 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 IX

This is the Multiples Choice Questions Part 9 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.

Multiple Choice Questions 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 IX of the Series

401. When the image at the receiving end of a facsimile transmission is elongated vertically,

  • 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

402. In FM fax, the frequencies for black and white are

  • A. 1500 and 2300 Hz
  • B. 2200 and 1500 Hz
  • C. 1300 and 2400 Hz
  • D. 1070 and 1270 Hz

403. It is a measure of the faithful reproduction of scanned prints in a facsimile communications.

  • A. fidelity
  • B. contrast
  • C. legibility
  • D. chroma

404. The feedback signals that help prevent the speaker from talking too loudly.

  • A. busy tone
  • B. ringback tone
  • C. dial tone
  • D. sidetone

405. It is the exchange of signaling messages between switching machines

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

406. A signal sent from the switching machine back to the calling station whenever the system cannot complete call because of equipment unavailability.

  • A. busy tone
  • B. call waiting tone
  • C. fax tone
  • D. congestion tone

407. The final length of cable pair that terminates at the SNI

  • A. aerial
  • B. drop wire
  • C. distribution cable
  • D. cross-connect cables

408. It is the difference in circuit gain experienced at a particular frequency with respect to the circuit gain of a reference frequency.

  • A. dynamic range
  • B. absorption distortion
  • C. attenuation distortion
  • D. selective fading

409. In telephone systems, a special type of line conditioning that pertains to line impairments for which compensation can be made with filters and equalizers.

  • A. A-line conditioning
  • B. B-line conditioning
  • C. C-line conditioning
  • D. D-line conditioning

410. An envelope delay distortion test on a basic telephone channel indicated that an 1800-Hz carrier experienced the minimum absolute delay of 400 us. The maximum envelope delay for a basic telephone channel is 1750 us within the frequency range 800 Hz to 2600 Hz. What is the maximum envelope delay?

  • A. 2150 microsec
  • B. 2550 microsec
  • C. 3000 microsec
  • D. 3400 microsec

411. In SS7 signaling points, codes that are carried in signaling messages exchanged between signaling points to identify the source and destination of each message

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

412. Stage of the step-by-step switching system that is composed of switches to complete the connection to the called subscriber.

  • A. line equipment
  • B. switch train
  • C. connectors
  • D. switching network

413. ____________ is the switching system that is a branch of the local central office.

  • A. local exchange
  • B. branch exchange
  • C. subscriber loop
  • D. line

414. Most fax printers are of which type?

  • A. Impact
  • B. Thermal
  • C. Electrosensitive
  • D. Laser xerographic

415. Aside from tip and ring used in local loops the third wire when used is called __________.

  • A. reserve
  • B. sleeve
  • C. ground
  • D. none of these

416. Acknowledgement and status signals that ensure the process necessary to set up and terminate a telephone call are completed in an orderly and timely manner,

  • A. call progress tones and signals
  • B. call waiting tones and signals
  • C. incoming call tones and signals
  • D. call termination tones and signals

417. POCSAG stands for

  • A. Post Office Code Standardization Advisory Group
  • B. Post Office Code System Advisory Group
  • C. Paging Operation Code Standardization Advisory Group
  • D. Paging Operation Code System Advisory Group

418. The location where individual cable pairs within a distribution cable are separated and extended to the subscriber’s location on a drop wire

  • A. feeder cable and distribution cable
  • B. drop wire and aerial cable
  • C. distribution cable and drop-wire cross-connect cables
  • D. distribution cable and aerial cable

419. What is the standard bandwidth of voice channel according to CCITT recommendations?

  • a. 300 – 3.4 kHz
  • b. 200 – 3.3 kHz
  • c. 20 – 20 kHz
  • d. 30 – 30 kHz

420. A the receiver, the phase difference at the different carrier frequencies is called _________.

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

421. It is a sudden, random changes in the phase of the signal. They are classified as temporary variations in the phase of the signal lasting longer than 4 ms.

  • A. phase hits
  • B. phase jitter
  • C. interference
  • D. distortion

422. Circuits that are designed and configured for their use only and often referred to as private circuits or dedicated circuits.

  • A. switched circuits
  • B. leased circuits
  • C. virtual circuits
  • D. switched virtual circuits

423. It is a programmable matrix that allows circuits to be connected to one another.

  • A. circuit switch
  • B. tap switch
  • C. equipment switch
  • D. cross switch

424. Interstate long distance telephone calls require a small telephone office called _________.

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

425. A call that cannot be completed because the necessary trunk circuits or switching paths are not available.

  • A. blocking
  • B. holding
  • C. storing
  • D. none of these

426. A mandate that requires all telephone companies to support the porting of telephone number.

  • A. national number portability
  • B. regional number portability
  • C. local number portability
  • D. sectional number portability

427. The connection between the telephone and the central office’s switching equipment.

  • A. subscriber loop
  • B. relay circuits
  • C. line sensors
  • D. supervisory relay

428. An exact reproduction of a document or picture provided at the receiving end.

  • A. television
  • B. telecommunication
  • C. facsimile transmission
  • D. mobile communication

429. What type of graphics are commonly transmitted by radio fax?

  • A. Newspaper text
  • B. Architectural drawings
  • C. Cable movies
  • D. Satellite weather photos

430. It is comprised of a transmitter, receiver, an electrical network for equalization, associated circuitry to control sidetone levels and to regulate signal power and necessary signaling circuitry.

  • A. telephone
  • B. television
  • C. facsimile
  • D. computer

431. Early paging system uses what modulation technique?

  • A. pulse modulation
  • B. amplitude modulation
  • C. phase modulation
  • D. frequency modulation

432. A device that serves as a demarcation point between local telephone company responsibility and subscriber responsibility for telephone service.

  • A. standard network interface
  • B. subscriber line interface card
  • C. system network architecture
  • D. network interface card

433. It is the actual time required for a particular frequency to propagate from a source to a destination through a communications channel.

  • A. relative phase delay
  • B. phase delay distortion
  • C. absolute phase delay
  • D. phase distortion

434. It is a sudden, random change in the gain of the circuit resulting in a temporary change in the signal level.

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

435. A typical echo suppressor suppresses the returned echo by how much?

  • A. 10 dB
  • B. 30 dB
  • C. 45 dB
  • D. 60 dB

436. In telephony, functions that supply and interpret control and supervisory signals needed to perform the operation

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

437. It is a central location where subscribers are interconnected, either temporarily or on a permanent basis.

  • A. central offices
  • B. exchange offices
  • C. exchanges
  • D. any of these

438. It is simply a path between two subscribers and is comprised of one or more switches, two local loops or possibly one or more trunk circuits.

  • A. way
  • B. route
  • C. path
  • D. mode

439. It defines the procedures and protocols necessary to exchange information over the PSTN using a separate digital signaling network to provide wireless and wireline telephone call setup, routing and control.

  • A.  C7
  • B. common channel signaling system no. 7
  • C. SS7
  • D. any of these

440. In a 4-wire telephone set connection, (used to connect telephone set to central office switching) the red 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

441. The connection between two central offices

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

442. In facsimile, the length of time required to transmit a document

  • A. propagation time
  • B. transmission rate
  • C. holding time
  • D. transmission time

443. It is a combination of passive components that are used to regulate the amplitude and frequency response of the voice signals.

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

444. A signal that is sent from the switching machine back to the calling station whenever the called telephone number is off-hook.

  • A. dial tone signal
  • B. ringback signal
  • C. busy signal
  • D. off-hook signal

445. A smaller version of the feeder cable containing less wire pairs.

  • A. aerial
  • B. drop wire
  • C. feeder cable
  • D. distribution cable

446. It is a parameter equivalent to TLP except that it is used as a reference for data transmission.

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

447. He developed the first instrument that transmitted music over a wire

  • A. Philipp Reis
  • B. Antonio Meucci
  • C. Thomas Edison
  • D. Almon Strowger

448. It is used to convert two-wire circuits to four-wire circuits which is similar to hybrid coil found in standard telephone sets.

  • A. balanced transformer
  • B. hybrid circuits
  • C. balanced modulator
  • D. hybrid transformers

449. A switchboard with four digits can accommodate how many telephone numbers?

  • A. 1,000
  • B. 10,000
  • C. 100,000
  • D. 9999

450. The trunk circuits that are terminated in tandem switches are called

  • A. tie trunks
  • B. tandem trunks
  • C. office trunks
  • D. exchange trunks

Complete List of MCQs in Communications Engineering per topic


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