MCQ in Wire and Wireless Communications System Part 2 | ECE Board

This is the Multiples Choice Questions Part 2 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 2 of the Series

51. When line is terminated in an open circuit load, the reflection coefficient is

A. Zero

B. Unity

C. Positive infinity

D. Negative infinity

52. A 300 ohms line is terminated in a resistance load of 200 ohms, the VSWR is

A. 0.65

B. 1.5

C. Unity

D. Zero

53. If the reflection coefficient is 0.5, the standing wave ratio is

A. 0.33

B. Unity

C. 3

D. Zero

54. To least the fault of the given line, a signal is fed to the line, 30 µs later the signal returned. What is the distance of the fault?

A. 9000 m

B. 300 m

C. 100 m

D. 4500 m

55. The telephone set is powered by the central office on the ring side at

A. 42 to 52 Vdc

B. –42 to -52 Vdc

C. 24 to 64 Vdc

D. –24 to – 64 Vdc

56. The telephone voice band frequency is from

A. 300 to 4 kHz

B. 400 to 3400 Hz

C. 300 to 3400 Hz

D. 400 to 4 kHz

57. Which of the following wire is used to transmit the signal?

A. Black

B. Yellow

C. Red

D. Green

58. The corresponding frequency for digit 7 in the touch tone telephone is

A. 770 & 1477 Hz

B. 852 & 1209 Hz

C. 852 & 1336 Hz

D. 770 & 1336 Hz

59. The physical connection between the telephone set and the switching equipment is called the

A. Trunk line

B. Link

C. Subscriber loop

D. Leased line

60. What is the local loop of a telephone system?

A. It is a two-wire or four-wire communication circuit between the customer’s premise and the central office

B. It is a group of wires connecting a telephone set to a modern

C. It is a four-wire circuit connecting a facsimile machine to a computer

D. It is a single piece of wire connecting the subscriber’s telephone set to another set in an adjacent room.

61. Which of the ff. equipment is used in long loop design?

A. Dial long lines

B. Voice repeater

C. Loop range extender

D. All of the above

62. What is a two-wire circuit?

A. A circuit usually in the subscriber loop, between the telephone set and the local central office.

B. A circuit having only two terminals, both terminals having the same instantaneous voltage.

C. A circuit with one input terminal, one output terminal, and a common ground.

D. A circuit consisting of two transmission lines.

63. 1 mW is equal to

A. 90 dBm

B. 0 dBm

C. -30 dBm

D. 120 dBm

64. Which of the following responds to the request of a subscriber by sending a dial tone?

A. Line finder

B. First selector

C. Connector

D. Line equipment

65. The other name of Class 2 office in the North American Switching Plan.

A. Primary center

B. Section

C. Regional center

D. Toll points

66. A cell in the cellular telephone system means

A. A power source

B. Small area

C. Large area

D. Service area

67. What is the linking point between cell phone and regular telephone?

A. Base station

B. Control office

C. C.O.

D. MTSO

68. What is the typical power output of a cellular phone?

A. 5 W

B. 10 W

C. 1 W

D. 3 W

69. When a single cell is divided into smaller cells that process is called

A. Cell splitting

B. Cell division

C. Reuse

D. Cell sharing

70. The first cell shape is a square

A. Square

B. Circle

C. Rectangle

D. Triangle

71. In order to provide 100% coverage without overlap, cellular telephone system can use

A. Hexagon cell shape

B. Triangle

C. Rectangular

D. All of the above

72. What is the beamwidth of the reflector of the receiving antenna in the base station

A. 20 degrees

B. 30 degrees

C. 50 degrees

D. 60 degrees

73. A cellular phone operates on

A. Half duplex

B. Full duplex

C. Echoplex

D. Lincomplex

74. Cellular phones transmit in the band from

A. 825 to 845 MHz

B. 835 to 855 MHz

C. 825 to 855 MHz

D. 825 to 865 MHz

75. Cell phone receives in the band from

A. 860 to 880 MHz

B. 870 to 890 MHz

C. 870 to 880 MHz

D. 860 to 890 MHz

76. What is the frequency separation between the transmit and the receive channels?

A. 30 MHz

B. 45 MHz

C. 55 MHz

D. 40 MHz

77. For channel 1, transmit/receive frequency is

A. 825.030/870.030 MHz

B. 835.03/880.03 MHz

C. 825.015/870.015 MHz

D. 825.15/870.15 MHz

78. The number of transmit/receive channels in the cellular system is

A. 625

B. 645

C. 655

D. 666

79. The transmission range of cellular telephony is generally about

A. 80 km

B. 65 km

C. 160 km

D. 16 km

80. One of the following is not an advantage of a cellular telephone system

A. Privacy

B. Large service area

C. No interference

D. Mobility

81. When the message is transferred from one cell site transmitter to another cell site transmitter as the caller crosses a boundary __________ process takes place.

A. Shifting

B. Hand off

C. Give off

D. Turn over

82. What is the sensitivity of a cellular receiver?

A. 20 dB

B. 40 dB

C. 50 dB

D. 60 dB

83. What is the frequency deviation of the cellular telephone system?

A. ±15 kHz

B. ±30 kHz

C. ±12 kHz

D. ±75 kHz

84. Hailing channel is otherwise known as

A. Conversation channel

B. Calling channel

C. Signaling channel

D. Remote channel

85. What is an Erlang?

A. It is a unit of magnetic field intensity measured around a conductor

B. It is the number of erroneous bits received per unit of time

C. It a unit of electrical energy radiated in space.

D. It is equal to the number of simultaneous calls originated during a specific hourly period.

86. All of the cell base stations are linked together by _______ which serves as the central office and management node for the group.

A. MTS

B. IMTS

C. MSTO

D. MTSO

87. Provides interface between the mobile telephone switching office and the mobile units.

A. Database

B. Cell site

C. Terrestrial link

D. Radio transmitter

88. A phone call over the cellular network actually requires

A. Simplex channels

B. Half duplex channels

C. Full duplex channels

D. Full/full duplex

89. A method of expressing the amplitudes of complex non-periodic signals such as speech.

A. Volume

B. Pitch

C. Frequency

D. Wavelength

90. _______ is signal returned to the talker after one or more round trips between the talker and the listener.

A. Singing

B. Echo

C. Jitter

D. Crosstalk

91. ______ is a voice operated device that inserts a high loss in the opposite direction of transmission of the talking party.

A. Hybrid

B. 2-wire circuit

C. Echo suppressor

D. VNL

92. _____ is picking up of the same station at two nearby points on the receiver dial.

A. Double spotting

B. Hot shot

C. Image frequency

D. Bail shot

93. When one channel picks up the signal carried by another channel.

A. Echo

B. Crosstalk

C. Party line

D. Crosslink

94. What type of connector arrangement wherein a customer may move to another location and still retain the same telephone number.

A. TPL

B. Bridge

C. TPS

D. Party line

95. It is an advantage of sidetone.

A. Transmission efficiency is increased

B. Speaker increase his voice resulting in a strengthened signal

C. No dissipation of energy in the balancing network

D. Assures the customer that the telephone is working

96. Radio communications between points using a single share frequency.

A. Simplex

B. Full duplex

C. Half-duplex

D. Full/full duplex

97. The transmission of information from multiple sources occurring on the same facility but not as the same time.

A. FDM

B. TDM

C. WDM

D. CDM

98. When human voice and music are transmitted, the type of communication employed is known as

A. Radiotechnology

B. Audio frequency

C. Wired audio

D. Radiotelephony

99. Printed documents to be transmitted by fax are converted into baseband electric signal by the process of

A. Copying

B. Scanning

C. Modulation

D. Light variation

100. What is the most commonly used light sensor in a modern fax machine?

A. Phototube

B. Phototransistor

C. Liquid-crystal display

D. Charge couple device

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