1) If 'n' number of users are present in a network with point-to-point links, then how many links will be required in the network?
a. n (n – 1)
b. n (n – 1) / 2
c. n (n – 1) / 4
d. n (n – 1) / 8
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2) Which among the following is/are adopted by cross bar systems with hard wired control subsystem?
a. Relays
b. Latches
c. Both a and b
d. None of the above
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3) Which kind of switching technique indicates the transfer of coded values from input to output during the same interval of time?
a. Space Switching
b. Time Switching
c. Combination Switching
d. None of the above
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4) What is the hardware, used to establish connection as an electrical path between inlet and outlet pair in switching system, known as?
a. Switching Matrix
b. Switching Network
c. Both a and b
d. None of the above
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5) In folded type of network, ____
a. input lines are folded back to output lines
b. output lines are folded back to input lines
c. input lines are folded back to themselves (input lines)
d. output lines are folded back to themselves (output lines)
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6) The ratio of number of successful calls to the number of call attempts is known as ______
a. Call Completion Rate (CCR)
b. Call Block Rate (CBR)
c. Busy Hour Call Rate (BHCR)
d. None of the above
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7) If a telephone exchange serves 1500 users with the average BHCA of about 9000 and CCR is about 50%, what would be the busy hour calling rate?
a. 2
b. 3
c. 4.5
d. 5
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8) How is the relation between Erlang and CCS specified?
a. 1 Erlang = 36 CCS
b. 1 Erlang = 56 CCS
c. 1 Erlang = 76 CCS
d. 1 Erlang = 96 CCS
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9) Percentage of occupancy can be defined as the percentage of _____ for which the server seems to be busy.
a. speed
b. distance
c. time
d. volume
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10) By which name/s is the Grade of Service (GOS) well-known?
a. Call congestion
b. Time congestion
c. Both a and b
d. None of the above
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11) Which among the following provides TRG access to outgoing junctions through the two stage network?
a. Expander
b. Distributor
c. Concentrator
d. Router
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12) Which shape of switches are not adopted normally due to non-usability of both way trunks?
a. Circular
b. Triangular
c. Hexagonal
d. Square
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13) In graded groups, switches with inaccessibility to the outgoing route gets ____ into the number of separate groups.
a. added
b. subtracted
c. multiplied
d. divided
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14) Which form/s of grading design has/have the tendency to share every trunk between equal number of groups?
a. Homogeneous Grading
b. Heterogeneous Grading
c. Skipped Grading
d. All of the above
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15) For the two-group grading consisting of 14 trunks, availability = 5, Ak = 1.4E and the required grade of service of about 0.01, what would be its traffic capacity?
a. 4.98 E
b. 6.72 E
c. 8.3 E
d. 10 E
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16) Which among the following controls the dynamic characteristics of Phase Locked Loop (PLL)?
a. Low Pass Filter
b. High Pass Filter
c. Band Pass Filter
d. Band Stop Filter
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17) After the application of line frequency in Phase Locked Loop (PLL), at which stage do/ does the VCO frequency start to exhibit variation?
a. Free running
b. Capture
c. Phase Lock
d. All of the above
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18) What is an acceptable value of dividing point between the wander and jitter?
a. 10 Hz
b. 20 Hz
c. 50 Hz
d. 200 Hz
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19) If the voltage controlled by VCO exhibits variation at faster and rapid rate, then the instability of clock is known as _______
a. Clock wander
b. Clock jitter
c. Clock frequency
d. Clock period
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20) Which theorem in random jitter specifies the composite effect of various uncorrelated noise sources despite the distribution approaches to Gaussian distribution?
a. Initial Value Theorem
b. Final Value Theorem
c. Central Limit Theorem
d. None of the above
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21) Which type of data network supports the interconnection of computers within highly populated area?
a. LAN
b. WAN
c. MAN
d. None of the above
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22) Which among the following is/are supported by LAN?
a. PABX
b. PSTN
c. SBDN
d. All of the above
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23) If the voice channel is free in PSTN, then what would be the maximum data rate supported by 3.1 kHz bandwidth of voice channel?
a. 2000 bps
b. 4000 bps
c. 6000 bps
d. 8000 bps
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24) In Phase Shift Keying, how many bit/s is/are allowed to be transmitted per shift?
a. 1
b. 2
c. 4
d. 8
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25) Which among the following utilizes the transmission line upto 85 - 95 %?
a. Voice Traffic
b. Data Traffic
c. Both a and b
d. None of the above
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26) If the system is designed with the usage of hexagonal-shaped cells, how are the base-stations located?
a. At the centre of cell
b. At the edge of cell
c. At the corner of the cell
d. All of the above
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27) Which antennas are used at the center of the cells for the system with hexagonal-shaped cells?
a. Omni-directional antennas
b. Sectored directional antennas
c. Both a and b
d. None of the above
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28) In a cellular telephone system, which type of interference results from imperfect design of filters in receivers by allowing nearby frequencies to enter the receiver?
a. Co-channel Interference
b. Adjacent-channel Interference
c. Both a and b
d. None of the above
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29) Which effect is widespread in adjacent-channel interference especially after the reception of a weak signal by a mobile user from the base-station?
a. Near-far effect
b. Doppler's effect
c. Capture effect
d. Kendall effect
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30) Which method of cellular network assists in minimizing the co-channel interference associated with the angle of degree?
a. Cell Splitting
b. Cell Sectoring
c. Cell Segmentation & Dualization
d. None of the above
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