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.
MCQ Topic Outline included in ECE Board Exam Syllabi
- MCQ in Mobile Communications
- MCQ in Cellular Communication
- MCQ in Trunk Radio
- MCQ in Radio Paging System
- MCQ in Facsimile
- MCQ in Telephone Set
- MCQ in Signaling
- MCQ in Transmission Considerations in long distance network
- MCQ in Insertion Loss
- MCQ in VF Repeaters
- MCQ in Traffic Calculations
- MCQ in Reference Equivalent and Standards
- MCQ in Telephone Networks
- MCQ in Billing
- MCQ in Network Hierarchy and Class type
- MCQ in Connection and Performance of Wire and Wireless Communications
Continue Practice Exam Test Questions Part 11 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
Answer: Option A
Solution:
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
Answer: Option C
Solution:
503. Group 2 fax that uses fax standard is
A. SSB
B. FSK
C. Vestigial sideband AM
D. PSK
Answer: Option C
Solution:
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
Answer: Option B
Solution:
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
Answer: Option A
Solution:
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
Answer: Option B
Solution:
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
Answer: Option A
Solution:
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
Answer: Option C
Solution:
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
Answer: Option D
Solution:
510. Systems that are simplex wireless communications systems designed to alert subscribers of awaiting messages
A. paging
B. searching
C. texting
D. calling
Answer: Option A
Solution:
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
Answer: Option A
Solution:
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
Answer: Option C
Solution:
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
Answer: Option A
Solution:
514. Signals that provide the routing information, such as calling and called numbers.
A. routing
B. calling
C. controlling
D. addressing
Answer: Option D
Solution:
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
Answer: Option A
Solution:
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
Answer: Option B
Solution:
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
Answer: Option C
Solution:
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
Answer: Option C
Solution:
519. How many point-to-point links are required to connect 50 telephones together?
A. 2255
B. 1225
C. 2250
D. 1552
Answer: Option B
Solution:
520. The first commercial switchboard was installed in
A. Connecticut
B. Boston
C. Pennsylvania
D. Washington
Answer: Option A
Solution:
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
Answer: Option B
Solution:
522. What is the standard scanning LPI rates?
A. 120
B. 25
C. 400
D. 195
Answer: Option A
Solution:
523. What tone is used to start fax?
A. 400 Hz
B. 100 Hz
C. 300 Hz
D. 500 Hz
Answer: Option C
Solution:
524. What tone is used to stop fax?
A. 450 Hz
B. 500 Hz
C. 150 Hz
D. 250 Hz
Answer: Option A
Solution:
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
Answer: Option D
Solution:
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
Answer: Option B
Solution:
527. To what is the output of a scanner fed in fax?
A. transmitter
B. receiver
C. mixer
D. oscillator
Answer: Option A
Solution:
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
Answer: Option C
Solution:
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
Answer: Option A
Solution:
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
Answer: Option C
Solution:
531. With what type transmitter is fax transmitted on HF?
A. AM
B. FM
C. PM
D. SSB
Answer: Option D
Solution:
532. With what type transmitter is fax transmitted on VHF?
A. FM
B. PM
C. SSB
D. AM
Answer: Option A
Solution:
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
Answer: Option C
Solution:
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
Answer: Option B
Solution:
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
Answer: Option B
Solution:
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
Answer: Option D
Solution:
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
Answer: Option D
Solution:
538. If the tuning meter reads midscale, what would this indicate in facsimile?
A. average
B. mistuned
C. peak
D. minimum
Answer: Option A
Solution:
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
Answer: Option C
Solution:
540. Why is the blade an endless loop in facsimile?
A. wears faster
B. wears slower
C. wears average speed
D. never wears
Answer: Option B
Solution:
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
Answer: Option B
Solution:
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
Answer: Option A
Solution:
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
Answer: Option C
Solution:
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
Answer: Option A
Solution:
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
Answer: Option C
Solution:
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
Answer: Option A
Solution:
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
Answer: Option B
Solution:
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
Answer: Option D
Solution:
549. The first number of the loaded cable designation 19H44 indicates
a. Spacing
b. Coil inductance
c. Wire gauge
d. Attenuation
Answer: Option C
Solution:
550. The letter of the loaded cable designation 24B88 indicates
a. Spacing
b. Coil inductance
c. Wire gauge
d. Attenuation
Answer: Option A
Solution:
Questions and Answers in Wire and Wireless Communications System Series
Following is the list of multiple choice questions in this brand new series:
Complete List of MCQ in Communications Engineering per topic
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