MCQ in Wire and Wireless Communications System Part 13 | ECE Board

This is the Multiple Choice Questions Part 13 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 13 of the Series

601. The step-by-step switch

a. Was invented by Strowger

b. Generates much noise

c. Operates using a system of electromechanical switches

d. All of these

602. The telephone was invented by

a. James Watson

b. Alexander Graham Bell

c. Phillip Reis

d. Almon Strowger

603. A switching network capable of providing a path from every inlet link to every outlet link in the absence of traffic.

a. Concentration

b. Blocking

c. Full availability switch

d. Crosspoint

604. An exchange primarily used as a switching point for traffic between other exchanger is

a. Transfer system

b. Transit Exchange

c. Connecting point

d. Local Exchange

605. A telephone switch is an example of ________ switching

a. Packet

b. Message

c. Circuit

d. Virtual circuit

606. The local loop of a telephone system is

a. A two–wire communication circuit between a customer’s premise and the central office

b. A group of wires connecting a telephone set to a modem

c. A four wire circuit connecting a fax machine to a computer

d. A single piece of wire connecting the subscriber’s telephone to another telephone set.

607. Identical telephone numbers in different parts of the country are distinguished by their

a. Access codes

b. Country codes

c. Trunk prefixes

d. Area codes

608. A telephone switching system with a capacity of 100 lines could assign telephone numbers from

a. 0001 – 1000

b. 000 – 999

c. 0000 – 1000

d. 001 – 999

609. The following are the building blocks of a Step-by-step Switching System except:

a. Marker

b. Line finder

c. Selector

d. Connector

610. Which has longer subscriber loop length, the Central Office Switching equipment having a resistance limit of

a. 5000 ohms

b. 1000 ohms

c. 1500 ohms

d. 2000 ohms

611. A fax transmission is usually at a _________ mode.

a. Simplex

b. Half duplex

c. Full duplex

d. Multiplex

612. A permanent circuit for private use within a communications network

a. Two-wire

b. 4-wire

c. Switched

d. Leased

613. The class of exchange with the primary function of connecting central offices when a direct trunk is not available

a. Local

b. Gateway

c. Toll

d. Tandem

614. Dial tone, busy tone and ring back tones are example of __________ signals.

a. Supervisory

b. Address

c. Musical

d. Digital

615. How much time in seconds is saved if we use Touch Tone Dialing instead of Pulse Dialing to call telephone number 781-10-05?

a. 3.55

b. 7.75

c. 7.55

d. 7.15

616. With attenuation limit at 6 dB, what is the length of cable using gauge 26 with attenuation of 1.61 dB per km.

a. 1.3 km

b. 4.7 km

c. 3.7 km

d. 2.5 km

617. The maximum length for 1300-ohm signalling or loop resistance using AWG No. 26 wire with 133.9 ohm per km.

a. 5.2 km

b. 4.7 km

c. 7.5 km

d. 9.7 km

618. The minimum size for an entrance conduit for building telephone facilities.

a. 50 mm

b. 50 cm

c. 65 mm

d. 65 cm

619. The size of entrance conduit for a 100 pair entrance cable.

a. 50 mm

b. 65 mm

c. 75 mm

d. 100 mm

620. The backboard color for the house or riser cable

a. Yellow

b. White

c. Blue

d. Red

621. The maximum span from telephone pole to the building for an aerial entrance cable.

a. 45 m

b. 600 mm

c. 30 m

d. 5.5 m

622. The sampling period for telephone signals

a. 8000 Hz

b. 125 µsec

c. 6400 Hz

d. 100 µsec

623. The inability to interconnect two idle lines connected to a switching network due to all possible paths are in use

a. Concentration

b. Blocking

c. Full availability

d. Crosspoint

624. The minimum depth for an underground entrance conduit under areas used for vehicular traffic inside private property

a. 300 mm

b. 600 mm

c. 50 mm

d. 1 m

625. The minimum clearance for aerial entrance cables over areas accessible to pedestrians is

a. 4.5 m

b. 5.5 m

c. 3.5 m

d. 6.5 m

626. The steel gauge of the outdoor MTTC

a. 16

b. 18

c. 20

d. 22

627. PAM is:

a. A pulse system immune from noise

b. A digital system

c. A popular system for telephone transmissions

d. An analog system

628. A suitable sampling rate for a signal containing frequency components between 40 Hz and 4 kHz would be:

a. 10 kHz

b. 80 Hz

c. 90 Hz

d. 4.04 kHz

629. Quantization noise can be reduced by:

a. Taking samples at a faster rate

b. Using a PCM system

c. Increasing the number of standard amplitude

d. Using higher amplitude signals

630. The name of the device invented by Johann Philipp Reis in 1860 which could transmit a musical tone over a wire to a distance point.

a. Harmonic telegraph

b. Phonograph

c. Telephone

d. Radio

631. When was the first complete sentence ever transmitted by the telephone?

a. 1860

b. 1876

c. 1892

d. 1905

632. Who invented the first practical system for the electrical switching of calls installed in 1892?

a. Bell

b. Watson

c. Edison

d. Strowger

633. What part of the conventional telephone set transmitter and receiver unit are located?

a. Dial

b. Base

c. Keypad

d. Handset

634. The type of transmitter widely used in the conventional telephone set.

a. Carbon

b. Ceramic

c. Piezoelectric

d. Electromagnetic

635. Who invented the first carbon type transmitter?

a. Bell

b. Watson

c. Gray

d. Edison

636. The type of receiver widely used in the conventional telephone set

a. Electromagnetic

b. Ceramic

c. Carbon

d. Piezoelectric

637. How many unique tones are used for the 12-key dual-tone multi-frequency keypad?

a. 2

b. 4

c. 7

d. 12

638. In the telephone industry, BORSCHT functions are performed by

a. Subscriber line interface

b. Cross point matrix

c. Switching network

d. Connector switch

639. In the telephone unit, what is produced when the balancing network in a hybrid circuit is intentionally unbalanced slightly so that small amount of transmitted signal is fed to the receiver of the talking phone?

a. Dial tone

b. Side tone

c. Echo

d. Singing

640. The type of dialing possible for telephone set with rotary dial.

a. Tone dialing

b. Pulse dialing

c. Loop dialing

d. E & m dialing

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