Articles by "Quiz in Wire and Wireless Communications"
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6:00 PM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 60 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.

Continue Part LX of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 591. For building telephone facilities, the size of entrance conduit shall not be less than _______ in diameter.

A. 30 mm

B. 50 mm

C. 60 mm

D. 75 mm

Question 592. In International Telephone Numbering, a digit or combination of digits characterizing the called numbering area within a country is called ________ code.

A. Local

B. CCITT

C. Baudot

D. Area

Question 593. The following are the transmission media used for telephone systems except:

A. Parallel wire

B. Coaxial wire

C. Fiber optics

D. None of these

Question 594. 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

Question 595. 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

Question 596. 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

Question 597. 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

Question 598. On the subscriber’s telephone set employing the touch tone technique, how many signals are transmitted to the telephone exchange for every button that is pressed?

A. 2 VHF signals

B. 1 VHF and 1 AF

C. 2 AF tones

D. 16 AF tones

Question 599. 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

Question 600. A subscriber loop signalling method in which signalling information is indicated by the presence and absence of a battery and ground condition on the line at the called end of the trunk.

A. Wet- Dry

B. Reverse Battery

C. High- Low

D. Supervisory

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6:00 AM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 59 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.

Continue Part LIX of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 581. 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

Question 582. When digits 3 is dialed using touch tone system, the amount of time needed to send the tone is

A. 0.1 sec

B. 50 msec

C. 0.25 sec

D. 0.25 sec

Question 583. If a busy counts are made during the span of 15 minutes, and the average number of occupied circuit is found to be 8, then the traffic, in Erlang, is:

A. 2

B. 8

C. 6

D. 4

Question 584. Group 2 fax that uses fax standard is

A. SSB

B. FSK

C. Vestigial sideband AM

D. PSK

Question 585. 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

Question 586. The approximation process in PCM creates noise called:

A. Thermal

B. White noise

C. Quantizing noise

D. Agitation noise

Question 587. 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

Question 588. Systems that are simplex wireless communications systems designed to alert subscribers of awaiting messages

A. paging

B. searching

C. texting

D. calling

Question 589. 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

Question 590. The main terminal used as cross connection point for cables 300 pairs and above.

A. MTTC

B. MDF

C. DP

D. TTC

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12:00 AM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 58 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.

Continue Part LVIII of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 571. 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

Question 572. For PCM, the sampling theorem states that the sampling frequency must be _________ the highest frequency contained in the analog signal.

A. twice

B. more than twice

C. less than twice

D. equal to

Question 573. Noise that is non-continuous, consisting of irregular pulse or noise spikes of short duration and of relatively high amplitude.

A. Solar

B. Intermodulation

C. Impulse

D. Crosstalk

Question 574. A telephone service wherein calls are rerouted into a preassigned station is called _________.

A. Camp-On

B. Call Forwarding

C. Call Barring

D. Abbreviated Dialing

Question 575. With what type transmitter is fax transmitted on VHF?

A. FM

B. PM

C. SSB

D. AM

Question 576. What tone is used to start fax?

A. 400 Hz

B. 100 Hz

C. 300 Hz

D. 500 Hz

Question 577. The criteria to be considered in designing a telephone system

A. Attenuation limit

B. Resistance limit

C. A or B

D. A and B

Question 578. 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

Question 579. 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

Question 580. 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

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6:00 PM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 57 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.

Continue Part LVII of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 561. To what is the output of a scanner fed in fax?

A. transmitter

B. receiver

C. mixer

D. oscillator

Question 562. A condition of a telephone handset, in which it can be called, is _______ condition.

A. On-hook

B. Off-hook

C. Busy

D. None of these

Question 563. The Strowger or step-by-step system falls under what type of switching control system?

A. Manual

B. Progressive

C. Common

D. Automatic

Question 564. A method of handling lost calls wherein a call failing to immediately find a server, waits enters a queue until one becomes available.

A. Lost Calls Cleared

B. Lost Calls Held

C. Lost Calls Delayed

D. None of these

Question 565. An electronic circuit which is inserted into the 4-wire trunk path effectively to block the passage of reflected signal energy

A. Echo suppressor

B. Echo suppressor

C. Loop extender

D. Telephone amplifier

Question 566. A method of multiplexing in which the total frequency spectrum available is used by each channel, but not part of the time.

A. FDM

B. TDM

C. SDM

D. GSM

Question 567. CCITT recommendation E-161 recommends that not more than ________ digits make up an international number, excluding the international prefix.

A. 10

B. 12

C. 16

D. 20

Question 568. 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

Question 569. In telephony, tone dialing takes ________ time than pulse dialing.

A. Less

B. More

C. About the same

D. Can’t be determined

Question 570. 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

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2:15 PM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 56 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.

Continue Part LVI of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 551. 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

Question 552. 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

Question 553. A type of signaling was developed as an alternative to loop signaling.

A. ear and mouth

B. duplex

C. loop pulsing

D. interoffice calling

Question 554. A telephone exchange has a subscriber loop limit of 1800 ohms, excluding the telephone instrument. What is the farthest distance, in miles, that a subscriber can be located away from the telephone exchange, if AWG 26 cable, which has a resistance of 431 ohms/loop mile, is used?

A. 5.95

B. 8.18

C. 3.9

D. 4.18

Question 555. Signals that provide the routing information, such as calling and called numbers.

A. routing

B. calling

C. controlling

D. addressing

Question 556. If the tuning meter reads midscale, what would this indicate in facsimile?

A. average

B. mistuned

C. peak

D. minimum

Question 557. The letter of the loaded cable designation 24B88 indicates

A. Spacing

B. Coil inductance

C. Wire gauge

D. Attenuation

Question 558. 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

Question 559. In a standard CCITT group, 12 channels FDM, the carrier frequency of the channel No. 1 is _______________.

A. 100 kHz

B. 102 kHz

C. 108 kHz

D. 60 kHz

Question 560. With what type transmitter is fax transmitted on HF?

A. AM

B. FM

C. PM

D. SSB

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6:00 AM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 55 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.

Continue Part LV of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 541. The first number of the loaded cable designation 19H44 indicates

A. Spacing

B. Coil inductance

C. Wire gauge

D. Attenuation

Question 542. 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

Question 543. A group of sixty voice channels with bandwidth of 240 kHz is called a

A. group

B. supergroup

C. mastergroup

D. jumbogroup

Question 544. The signal to noise ratio for voice based on customer satisfaction is

A. 30 db

B. 35 db

C. 15 db

D. 20 db

Question 545. 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

Question 546. 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

Question 547. A trunk is

A. The base of a communication tower

B. A telephone line connecting two C.O.’s

C. A line connecting one telephone set to the PABX

D. The structure where antenna are attached

Question 548. The following are signalling functions except:

A. Ringing signals

B. Address signals

C. Supervisory signals

D. None of these

Question 549. During a busy hour in a telephone system an average of one call is lost, then the grade of service is considered to be:

A. 1.01

B. 10%

C. 0.10%

D. 0.01

Question 550. An induction coil which is multiple winding transformer intended to interface a 2-wire circuit to be a 4-wire circuit to permit two-way transmission of signals.

A. Hybrid function

B. Speech transformer

C. Transmission regulation circuit

D. A or B

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12:00 AM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 54 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.

Continue Part LIV of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 531. Telephone switching is accomplished by

A. Manual Switchboard

B. Step-by-step Switches

C. Crossbar switches

D. Any of these

Question 532. 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

Question 533. What tone is used to stop fax?

A. 450 Hz

B. 500 Hz

C. 150 Hz

D. 250 Hz

Question 534. 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

Question 535. A telephone number perform the following operations except

A. To route the call

B. To activate the necessary apparatus for proper call charging

C. To order clearing of connection

D. None of these

Question 536. What is the standard scanning LPI rates?

A. 120

B. 25

C. 400

D. 195

Question 537. 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

Question 538. What type of control system crossbar switches are operating?

A. Manual

B. Progressive

C. Common

D. Automatic

Question 539. A line linking telephone central offices is called _____________ line.

A. Tie

B. Inter-office trunk

C. Routing

D. Connector

Question 540. The standard spacing for 19-D-88 cable loading code is

A. 700 ft.

B. 6000 ft.

C. 4500 ft.

D. 3000 ft.

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6:00 PM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 53 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.

Continue Part LIII of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 521. The common channel interoffice signalling method

A. Uses the same channel for signalling as for the related conversation

B. Is used on local loops

C. Uses a separate channel for signalling only

D. Comes the signalling for one related conversation

Question 522. ___________ is a unit of telephone traffic defined as one user making a call of one second duration.

A. CCS

B. Call-second

C. Erlangs

D. Call-hour

Question 523. The subscriber loop provides the following except:

A. Talk battery

B. Ringing voltage

C. Telephone dial

D. Current during on hook

Question 524. Why is the blade an endless loop in facsimile?

A. wears faster

B. wears slower

C. wears average speed

D. never wears

Question 525. The primary cause of echo and singing is

A. Intermodulation noise

B. Crosstalk

C. Impedance mismatch

D. Thermal noise

Question 526. An arrangement where the only possible connection between a numbers of exchanges is through a single tandem or transit exchange where they are all connected.

A. Mesh

B. Star

C. Composite

D. Ring

Question 527. The last two digits of the loaded cable designation 22E66 indicates

A. Spacing

B. Coil inductance

C. Wire gauge

D. Attenuation

Question 528. The voice frequency channel pass band is:

A. 0 to 4000 Hz

B. 300 to 3000 Hz

C. To carry only speech

D. ALL of these

Question 529. 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

Question 530. In the FDM hierarchy, a mastergroup is composed of ten supergroups and is equivalent to

A. 600 channels

B. 60 channels

C. 180 channels

D. 120 channels

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3:00 PM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 52 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.

Continue Part LII of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 511. How many point-to-point links are required to connect 50 telephones together?

A. 2255

B. 1225

C. 2250

D. 1552

Question 512. 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

Question 513. 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

Question 514. This refers to loop AC reference frequency measured in decibels

A. Signalling limits

B. Resistance limits

C. Attenuation limits

D. All of these

Question 515. 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

Question 516. The average intensity in one or more traffic paths occupied in the busy hour by one 2-minute call for an aggregate duration of two minutes.

A. CCS

B. Cm

C. Erlang

D. EBHC

Question 517. PABX stands for

A. Private All-purpose Broadcasting Exchange

B. Private Automatic Branch Exchange

C. Public Access Bidirectional Exchange

D. Public Address Broadcasting Exchange

Question 518. The first commercial switchboard was installed in

A. Connecticut

B. Boston

C. Pennsylvania

D. Washington

Question 519. The number to be dialed or called to reach a subscriber in the same local network or numbering area is

A. Local code

B. Area code

C. Toll access code

D. Subscriber No.

Question 520. 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

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1:07 PM

Quiz in Wire and Wireless Communications System

This is the Online Practice Quiz in Wire and Wireless Communications System Part 51 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.

Continue Part LI of the Online Practice Quiz

Quiz in Wire and Wireless Communications System

Question 501. 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

Question 502. 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

Question 503. A signalling technique wherein a number of voice paths is carried over one common channel instead of having individual voice channels.

A. In band signalling

B. Out of band signalling

C. Common channel signalling

D. Alternate channel signalling

Question 504. For crosstalk to be considered intelligible, at least ________ words are intelligible to the listener in a seven second period.

A. 5

B. 6

C. 4

D. 3

Question 505. What is used to transmit more than one conversation over a path?

A. Hybrid

B. Tandem

C. Multiplexing

D. All of these

Question 506. 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

Question 507. dBa is a noise unit which uses a tone of 1000 Hz and a power level of

A. -85 dBm

B. -90 dBm

C. 85 dBm

D. -80 dBm

Question 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

Question 509. That part of the telephone network between the telephone instrument at the subscriber premises and the central office equipment is called the _______________.

A. Inter-office trunk

B. Tie line

C. Subscriber loop

D. Service drop wire

Question 510. 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

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