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:
Continue Practice Exam Test Questions Part II of the Series
51. When line is terminated in an open circuit load, the reflection coefficient is
- A. Unity
- B. Zero
- 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. Raditechnology
- 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
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