MCQs in Wire and Wireless Communications System Part XII

Compiled MCQs in Wire and Wireless Communications System Part 12 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 XII

This is the Multiples Choice Questions Part 12 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 12: MCQs from Number 551 – 600                Answer key: PART XII

Continue Practice Exam Test Questions Part XII of the Series

551. 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

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

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

553. 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

554. 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

555. 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 the above

556. 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.

557. 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

558. A line linking telephone central offices is called _____________ line.

  • a. Tie
  • b. Inter-office trunk
  • c. Routing
  • d. Connector

559. 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

560. ___________ 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

561. 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

562. 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

563. 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

564. 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

565. The approximation process in PCM creates noise called:

  • a. Thermal
  • b. White noise
  • c. Quantizing noise
  • d. Agitation noise

566. The criteria to be considered in designing a telephone system

  • a. Attenuation limit
  • b. Resistance limit
  • c. A or B
  • d. A and B

567. This refers to loop AC reference frequency measured in decibels

  • a. Signalling limits
  • b. Resistance limits
  • c. Attenuation limits
  • d. All of these

568. An inuction 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

569. 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

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

  • a. Mesh
  • b. Star
  • c. Composite
  • d. Ring

571. 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

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

  • a. Parallel wire
  • b. Coaxial wire
  • c. Fiber optics
  • d. NOTA

573. The subscriber loop provides the following except:

  • a. Talk battery
  • b. Ringing voltage
  • c. Telephone dial
  • d. Current during on hook

574. 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

575. The primary cause of echo and singing is

  • a. Intermodulation noise
  • b. Crosstalk
  • c. Impedance mismatch
  • d. Thermal noise

576. 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

577. 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

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

  • a. 30 db
  • b. 35 db
  • c. 15 db
  • d. 20 db

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

  • a. -85 dBm
  • b. -90dBm
  • c. 85dBm
  • d. -80dBm

580. 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

581. 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. NOTA

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

  • a. MTTC
  • b. MDF
  • c. DP
  • d. TTC

583. 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

584. a group of sixty voice channels with bandwidth of 240 kHz is called a

  • a. group
  • b. supergroup
  • c. mastergroup
  • d. jumbogroup

585. 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

586. 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. Loading coil
  • c. Loop extender
  • d. Telephone amplifier

587. The following are signalling functions except:

  • a. Ringing signals
  • b. Address signals
  • c. Supervisory signals
  • d. None of these

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

  • a. 700 ft.
  • b. 6000 ft.
  • c. 4500 ft.
  • d. 3000 ft.

589. 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

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

  • a. Manual
  • b. Progressive
  • c. Common
  • d. Automatic

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

592. In telephony, tone dialing takes ________ time than pulse dialing.

  • a. Less
  • b. More
  • c. About the same
  • d. Can’t be determined

593. 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

594. What type of control system crossbar switches are operating?

  • a. Manual
  • b. Progressive
  • c. Common
  • d. Automatic

595. PABX stands for

  • a. Private All-purpose Broadcasting Exchange
  • b. Private Automatic Branch Exchange
  • c. Public Access Bidirectional Exchange
  • d. Public Address Broadcasting Exchange

596. 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

597. 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 the preceding

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

  • a. Hybrid
  • b. Tandem
  • c. Multiplexing
  • d. All of the above

599. 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

600. Telephone switching is accomplished by

  • a. Manual Switchboard
  • b. Step-by-step Switches
  • c. Crossbar switches
  • d. Any of the these

Complete List of MCQs in Communications Engineering per topic


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