Online Questions and Answers Topic Outline
- MCQs in Transmission System
- MCQs in Transmission Medium
- MCQs in Velocity and Line Wavelength
- MCQs in Characteristics Impedance
- MCQs in Primary Line Constants and Propagation Constants
- MCQs in Standing Waves
- MCQs in Voltage Standing Wave Ratio
- MCQs in Telephone Lines and Cables
- MCQs in Wave Guides
- MCQs in Balanced and Unbalanced Lines
- MCQs in Twisted pair wire, Coaxial Cable
- MCQs in Decibel
- MCQs in Signal and Noise Fundamentals
MCQs in Transmission Fundamentals 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. If the grade of service of a telephone system indicated P = 0.05, what does it mean?
- a. Completed calls of 5%
- b. Lost calls of 5%
- c. Lost calls of 95%
- d. Lost calls of 105%
52. ________ is the Out-of-Band signaling between Toll Central Offices (Bell System Standard).
- a. 3, 825 Hz
- b. 3, 700 Hz
- c. 2, 600 Hz
- d. 800 Hz
53. In a telephone system, the customer’s telephone directory numbering is from 000 to 999, what is the capacity of a telephone system numbering from 000 to 999?
- a. 100 lines
- b. 1000 lines
- c. 10, 000 lines
- d. 100, 000 lines
54. If the SWR is infinite, what type of load transmission line has?
- a. Purely reactive
- b. Purely resistive
- c. Purely capacitive
- d. Purely inductive
55. Not more than _______ digits make up an international telephone number as recommended by CCITT REC. E. 161.
- a. 8
- b. 10
- c. 11
- d. 12
56. One (1) Erlang is equal to _______.
- a. 360 CCS
- b. 36 CCS
- c. 3.6 CCS
- d. 100 CCS
57. Standard tariff for flat rate telephone service beyond the normal flat rate in that area.
- a. WATS
- b. OTLP
- c. TIP
- d. DTWX
58. The standard analog telephone channel bandwidth.
- a. 300-3400 Hz
- b. 1200 Hz
- c. 200-3200 Hz
- d. 300-3000 Hz
59. Type of switching in which a pair of wire from the telephone set terminates in a jack and the switch is supervised by an operator.
- a. Crossbar switching
- b. Manual switching
- c. Electronic switching
- d. Step-by-step switching
60. Every time when the telephone is idle, the handset is in the _______ state.
- a. On-hook
- b. Off-hook
- c. Busy
- d. Spare
61. _______ is a component in the telephone set that has the primary function of compensating for the local loop length.
- a. Resistor
- b. Varistor
- c. Capacitor
- d. Induction coil
62. What kind of receiver is used in conventional telephone handset?
- a. Carbon
- b. Electromagnetic
- c. Ceramic
- d. Capacitor
63. A voice-grade circuit using the PTN ha an ideal passband of
- a. 0 to 4 Hz
- b. 0 to 4 MHz
- c. 0 to 4 kHz
- d. 0 to 4 GHz
64. ________ is the minimum-quality circuit available using the PTN.
- a. Basic voice grade (VG)
- b. Basic voice channel (VC)
- c. Basic voice band (VB)
- d. Basic telephone channel
65. Direct distance dialing (DDD) network is called
- a. Private-line network
- b. PT network
- c. Dial-up network
- d. Trunk network
66. What is the advantage of sidetone?
- a. Transmission efficiency is increased
- b. Speaker increases his voice resulting in a strengthened signal
- c. No dissipation of energy in the balancing network
- d. Assure the customer that the telephone is working
67. ________ is a special service circuit connecting two private branch exchanges (PBX).
- a. Phantom line
- b. Tie trunk
- c. Tandem trunk
- d. Private line
68. The published rates, regulation, and descriptions governing the provision of communications service for public use.
- a. Toll rate
- b. Tariff
- c. Bulk billing
- d. Detailed billing
69. What is the power loss of a telephone hybrid?
- a. 1 dB
- b. 2 dB
- c. 3 dB
- d. 6 dB
70. Telephone channel has a band-pass characteristic occupying the frequency range of _______.
- a. 300-400 Hz
- b. 300-3400 Hz
- c. 300-3000 Hz
- d. 300-2700 Hz
71. The first Strowger step-by-step switch was used in _______.
- a. 1875
- b. 1890
- c. 1897
- d. 1913
72. What is the phase delay of an 800 Hz voice signal if the phase shift is 15 degrees?
- a. 52 μsec
- b. 1.25 μsec
- c. 83.33 μsec
- d. 26 μsec
73. What is the CCITT recommendation for a preparation of loss plan, a variable loss plans and a fixed loss plan?
- a. G. 133
- b. G. 141
- c. G. 132
- d. G. 122
74. What is the diameter of a copper wire to be used in a 16 km loop with a dc loop resistance of 100 ohms/km?
- a. 0.838 mm
- b. 0.465 mm
- c. 1.626 mm
- d. 2.159 mm
75. What kind of cell is appropriate for load management, fast moving mobiles and low-usage areas?
- a. Pico cells
- b. Micro cells
- c. Nano cells
- d. Umbrella cells
76. In cellular networks, standard base station antennas are placed by _______.
- a. adaptive array
- b. flat plate antenna
- c. dipole array
- d. focused antenna
77. What is the basis of the first generation wireless local loop?
- a. Digital cellular technology
- b. Analogue cellular technology
- c. PSTN
- d. AMPS technology
78. When the calling party hears a “busy” tone on his telephone, the call is considered
- a. lost
- b. disconnected
- c. completed
- d. incomplete
79. Short-circuited stubs are preferred to open circuited stubs because the latter are
- a. more difficult to make and connect
- b. made of a transmission line with a different characteristic impedance
- c. liable to radiate
- d. incapable of giving a full range of reactances
80. What is the ratio of the reflected voltage to the incident voltage?
- a. VSWR
- b. ISWR
- c. SWR
- d. Coefficient of reflection
81. One method of determining antenna impedance.
- a. Sub matching
- b. Trial and error
- c. Smith chart
- d. Quarter-wave matching
82. ________ is a single conductor running from the transmitter to the antenna.
- a. Single-wire line
- b. Microstrip
- c. Twin-lead
- d. Coaxial line
83. Coaxial cable impedance is typically _______.
- a. 150 to 300 ohms
- b. 50 to 75 ohms
- c. 30 to 45 ohms
- d. 300 to 600 ohms
84. Waveguide becomes compulsory above what frequencies?
- a. Above 3 GHz
- b. Above 10 kHz
- c. At 300 MHz
- d. Above 10 GHz
85. Nominal voice channel bandwidth is _______.
- a. 20 to 30 kHz
- b. 0 to 3 kHz
- c. 4 kHz
- d. 55 kHz above
86. Echo suppressors are used on all communications system when the round trip propagation time exceeds _______.
- a. 50 ms
- b. 30 ms
- c. 100 ms
- d. 1 ms
87. A radio transmission line of 300 ohms impedance is to be connected to an antenna having an input impedance of 150 ohms. What is the impedance of a quarter-wave matching line?
- a. 212 ohms
- b. 250 ohms
- c. 200 ohms
- d. 150 ohms
88. Quarter-wavelength line is used as _______.
- a. impedance transformer
- b. lecher line
- c. transmission line
- d. harmonic suppressor
89. The transmission lines which can convey electromagnetic waves only in higher modes is usually called
- a. coaxial cable
- b. waveguide
- c. power lines
- d. twisted wire of telephone line
90. Why is nitrogen gas sometimes used in waveguide?
- a. To increase the distributed capacitance
- b. To keep the waveguide dry
- c. To reduce the skin effect at the walls of the guide
- d. To raise the guide’s wave impedance
91. The apparent speed of propagation along a waveguide based on the distance between wavefronts along the walls of the guide is called
- a. group velocity
- b. phase velocity
- c. normal velocity
- d. abnormal velocity
92. How do you couple in and out of a waveguide?
- a. Wrap a coil of wire around one end of the waveguide
- b. Insertion of an E-probe into the waveguide
- c. Insertion of an H-loop into the waveguide
- d. Both B and C
93. A rectangular waveguide is operating in the dominant TE10 mode. The associated flux lines are established
- a. transversely across the narrow dimension of the waveguide
- b. transversely across the wide dimension of the waveguide
- c. in the metal walls parallel to the direction of propagation
- d. in the metal walls perpendicular to the direction of propagation
94. For dominant mode of a rectangular waveguide, the distance between two instantaneous consecutive positions of maximum field intensity (in a direction parallel to the walls of the waveguide) is referred to as half of the
- a. free-space wavelength
- b. cutoff wavelength in the wide dimension
- c. guide wavelength
- d. group wavelength
95. The guide wavelength, in a rectangular waveguide is
- a. equal to the free-space wavelength at the cutoff frequency
- b. equal to the free-space wavelength for the same signal frequency
- c. less than the free-space wavelength at the cut-off frequency
- d. greater than the free-space wavelength at the same signal frequency
96. Using the TE10 mode, microwave power can only be transmitted in free rectangular guide provided
- a. the wider dimension is less than one-half of the wavelength in free space
- b. the narrow dimension is less than one-quarter of the wavelength in free space
- c. the wide dimension is greater than one-half of the guide wavelength
- d. the wide dimension is greater than one-half of the wavelength in free space
97. If the signal frequency applied to a rectangular guide is increased and the dominant mode is employed
- a. the free space wavelength is increased
- b. the phase velocity increased
- c. the guide wavelength is increased
- d. the group velocity, Vg, is increased
98. If a 6 GHz signal is applied to a rectangular waveguide and the reflection angle is 20o, what is the value of the guide wavelength?
- a. 6.10 cm
- b. 5.32 cm
- c. 4.78 cm
- d. 5.00 cm
99. The inner dimensions of a rectangular wavelength are 1.75 cm by 3.5 cm. The cutoff wavelength for the dominant mode is
- a. 1.75 cm
- b. 3.5 cm
- c. 7.0 cm
- d. 0.4375 cm
100. A signal whose wavelength is 3.5 cm is being propagated along a guide whose inner dimensions are 2 cm by 4 cm. What is the value of the guide wavelength?
- a. 3.12 cm
- b. 3.89 cm
- c. 3.57 cm
- d. 6.30 cm
Post a Comment