McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electronics and Telecommunication Engineering [ENTC] .
| 1. |
Which model of loss system allows the usage of Poisson distribution model for traffic analysis especially by assuming infinite number of users? |
| A. | lost calls cleared (lcc) |
| B. | lost calls returned (lcr) |
| C. | lost calls held (lch) |
| D. | none of the above |
| Answer» A. lost calls cleared (lcc) | |
| 2. |
Which type of holding time distribution is assumed for the voice conversation on telephone? |
| A. | constant |
| B. | exponential |
| C. | both a and b |
| D. | none of the above |
| Answer» B. exponential | |
| 3. |
If the queuing systems are connected in tandem configuration, what would be the nature of delay? |
| A. | commutative |
| B. | distributive |
| C. | cumulative |
| D. | deductive |
| Answer» A. commutative | |
| 4. |
In analyzing the traffic performance, how is the number of trunk decided with the provision of the Grade of Service (GoS) especially for larger group? |
| A. | by normal load condition |
| B. | by overload condition |
| C. | by underload condition |
| D. | none of the above |
| Answer» B. by overload condition | |
| 5. |
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 |
| Answer» A. call congestion | |
| 6. |
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 |
| Answer» A. 1 erlang = 36 ccs | |
| 7. |
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 |
| Answer» A. call completion rate (ccr) | |
| 8. |
Which assumption prooves call arrivals has Poisson's distribution? |
| A. | pure chance traffic |
| B. | statistical equilibrium |
| C. | full availability |
| D. | calls which faces congestion and gets lost |
| Answer» A. pure chance traffic | |
| 9. |
The process in which control signal shares the same path as voice and data is called as __________ |
| A. | pcm signalling |
| B. | inband signalling |
| C. | outband signalling |
| D. | all of the above |
| Answer» B. inband signalling | |
| 10. |
Percentage of occupancy can be defined as the percentage of _____ for which the server seems to be busy. |
| A. | volume |
| B. | speed |
| C. | distance |
| D. | time |
| Answer» D. time | |
| 11. |
Erlang -B and Erlang-C formulae became foundational results in _________ |
| A. | teletraffic engineering |
| B. | queueing theory |
| C. | both 1 and 2 |
| D. | none of the above |
| Answer» C. both 1 and 2 | |
| 12. |
A message of one signal unit length is called as _________ |
| A. | single unit message |
| B. | multi unit message |
| C. | double unit message |
| D. | all of the above |
| Answer» A. single unit message | |
| 13. |
________ group of trunk's system is more efficient. |
| A. | small |
| B. | medium |
| C. | large |
| D. | none of the above |
| Answer» C. large | |
| 14. |
The system in which call requests are kept waiting due to unavailability of trunks is known as ____________ |
| A. | lost calls system |
| B. | queueing system |
| C. | lost systems in tandem |
| D. | none of the above |
| Answer» B. queueing system | |
| 15. |
If a group of trunk is offered 1200 calls during the busy hour & 20 calls are lost along with the average call duration of about 7 min, then what would be the total duration of congestion period? |
| A. | 21.6 sec |
| B. | 42.2 sec |
| C. | 57.6 sec |
| D. | 98.2 sec |
| Answer» C. 57.6 sec | |
| 16. |
Customer line signalling is used for __________ |
| A. | generation of supervision signals and digits |
| B. | conversion of received electrical tone and announcement signals into sound signals |
| C. | conversion of electrical ringing signal into a high level acoustic signal |
| D. | all of the above |
| Answer» D. all of the above | |
| 17. |
CCS signalling network is based on __________ |
| A. | geographical location of signalling points |
| B. | number and size of signalling points |
| C. | offered load and services to be provided |
| D. | all of the above |
| Answer» D. all of the above | |
| 18. |
During Busy hour, 1000 calls were offered to a group of trunks and 5 calls were lost. The average call duration was 2 minutes. Find Grade of Service (B) |
| A. | 0.025 |
| B. | 0.005 |
| C. | 0.076 |
| D. | 0.056 |
| Answer» B. 0.005 | |
| 19. |
A group of 5 trunks is offering 2 Erlangs of traffic. Find the probability that at least one trunk is free. |
| A. | 0.037 |
| B. | 0.275 |
| C. | 0.0917 |
| D. | 0.963 |
| Answer» D. 0.963 | |
| 20. |
During Busy hour, 1200 calls were offered to a group of trunks and 6 calls were lost. The average call duration was 3 minutes. Find Traffic carried(Ac) |
| A. | 60e |
| B. | 0.3e |
| C. | 59.7e |
| D. | 55.9e |
| Answer» C. 59.7e | |
| 21. |
A group of 20 servers carry a traffic of 10 Erlangs. If average duration of calls is 3 minutes, calculate the no. of calls put through by a single server and a group as a whole in 1 hour period. |
| A. | 10 calls by single server and 200 calls by a group |
| B. | 8 calls by single server and 250 calls by a group |
| C. | 100 calls by single server and 200 calls by a group |
| D. | none of the above |
| Answer» A. 10 calls by single server and 200 calls by a group | |
| 22. |
Over 20 minutes observation interval, 40 subscribers initiate a call. Total duration of calls is 4800sec. Calculate load offered to network by the subscribers and average subscriber traffic? |
| A. | 2e and 0.5e respectively |
| B. | 3e and 1.5e respectively |
| C. | 4e and 0.1e respectively |
| D. | 1e and 0.2e respectively |
| Answer» C. 4e and 0.1e respectively | |
| 23. |
Formats of signal units in CCTTT no. 7 signalling system are ________________ |
| A. | message signalling unit |
| B. | link-status signalling unit |
| C. | fill-in unit |
| D. | all of the above |
| Answer» D. all of the above | |
| 24. |
Features of CCITT no. 7 signalling system (SS7) are ________________ |
| A. | used in services like telephony, data,images and video. |
| B. | suitable for terrestrial as well as satellite links. |
| C. | internationally accepted standard |
| D. | all of the above |
| Answer» D. all of the above | |
| 25. |
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 |
| Answer» B. 3 | |
| 26. |
Major classes of signalling are ___________ |
| A. | customer line signalling |
| B. | in channel signalling |
| C. | common channel signalling |
| D. | both 2 and 3 |
| Answer» D. both 2 and 3 | |
| 27. |
On an average, one call arrives every 5 seconds. During a period of 10 seconds, what is the probability that no call arrives? |
| A. | 0.123 |
| B. | 0.135 |
| C. | 0.595 |
| D. | 0.455 |
| Answer» B. 0.135 | |
| 28. |
Standards of CCITT Signalling system are _____ |
| A. | ss6 |
| B. | ss5 |
| C. | ss7 |
| D. | both 1 and 3 |
| Answer» D. both 1 and 3 | |
| 29. |
Inter register signalling can be done by _________ |
| A. | link by link basis |
| B. | end to end basis |
| C. | line signalling |
| D. | all of the above |
| Answer» D. all of the above | |
| 30. |
In Erlang's analysis of efficient telephone line usage he derived the formulae for two important cases, ________, |
| A. | erlang-b |
| B. | erlang-c |
| C. | erlang-a |
| D. | both 1 and 2 |
| Answer» D. both 1 and 2 | |
| 31. |
What are the types of inter register signalling? |
| A. | en-bloc signalling |
| B. | overlap signalling |
| C. | both 1 and 2 |
| D. | none of the above |
| Answer» C. both 1 and 2 | |
| 32. |
Erlang determined GoS of lost call system of finite number of trunks based on assumptions: 1. Pure chance traffic 2. Statistical equilibrium 3. Full availability 4. calls which face congestion and get lost |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | all of the above |
| Answer» D. all of the above | |
| 33. |
Traffic tables show relationships of ____________ |
| A. | offered traffic \a\ |
| B. | blocking probability (gos) |
| C. | number of trunks \n\ |
| D. | all of the above |
| Answer» D. all of the above | |
| 34. |
A group of 10 servers carry a traffic of 5E. If the average duration of calls is 1.5 minutes, calculate the number of calls put through by a single server and a group as a whole in 1 hr period. |
| A. | 20 calls and 200 calls |
| B. | 10 calls and 200 calls |
| C. | 5 calls and 100 calls |
| D. | none of the above |
| Answer» A. 20 calls and 200 calls | |
| 35. |
A group of 5 trunks carry a traffic of 2E. Find 1. GoS 2. Probability that only one trunk is busy. |
| A. | 0.037 and 0.275 |
| B. | 0.027 and 0.325 |
| C. | 0.047 and 0.475 |
| D. | none of the above |
| Answer» A. 0.037 and 0.275 | |
| 36. |
Over 10 minutes observation interval, 20 subscribers initiate a call. Total duration of calls is 2400sec. Calculate load offered to network by the subscribers and average subscriber traffic? |
| A. | 4e and 0.1e respectively |
| B. | 2e and 0.5e respectively |
| C. | 3e and 1.5e respectively |
| D. | 1e and 0.2e respectively |
| Answer» A. 4e and 0.1e respectively | |
| 37. |
Which among the following represents the flawless hand-off with no perceivable interruption of service? |
| A. | Hard hand-off |
| B. | Soft hand-off |
| C. | Intracell hand-off |
| D. | Intercell hand-off |
| Answer» B. Soft hand-off | |
| 38. |
If more number of cells are necessary in the frequency reuse distance, then the segmentation & dualization techniques get ________ |
| A. | United |
| B. | Divided |
| C. | Restricted |
| D. | Filtered |
| Answer» A. United | |
| 39. |
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 |
| Answer» B. Cell Sectoring | |
| 40. |
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 |
| Answer» A. Near-far effect | |
| 41. |
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 |
| Answer» A. Omni-directional antennas | |
| 42. |
The most comman dial up service used by a person making home telephone call is_____________ |
| A. | Analog Switched Service |
| B. | Analog Leased Service |
| C. | Switched/56 Service |
| D. | Digital Data Service |
| Answer» A. Analog Switched Service | |
| 43. |
For Telephone voice Transmission to use a T line, the signal must be __________________ before the multiplexed. |
| A. | Synchronized |
| B. | Modulated |
| C. | Sampled |
| D. | Filterd |
| Answer» C. Sampled | |
| 44. |
The propagation model that estimates radio coverage of a transmitter is called ___________ |
| A. | Large scale propagation model |
| B. | Small scale propagation model |
| C. | Fading model |
| D. | Okumura model |
| Answer» A. Large scale propagation model | |
| 45. |
The mechanism behind electromagnetic wave propagation cannot be attributed to _____ |
| A. | Reflection |
| B. | Diffraction |
| C. | Scattering |
| D. | Sectoring |
| Answer» D. Sectoring | |
| 46. |
Small scale propagation model is also known as _______ |
| A. | Fading model |
| B. | Micro scale propagation model |
| C. | Okumura model |
| D. | Hata model |
| Answer» A. Fading model | |
| 47. |
Which of the following techniques do not help in expanding the capacity of cellular system? |
| A. | Sectoring |
| B. | Scattering |
| C. | Splitting |
| D. | Microcell zone concept |
| Answer» B. Scattering | |
| 48. |
Which of the following technology distributes the coverage of the cell and extends the cell boundary to hard-to-reach places? |
| A. | Cell splitting |
| B. | Scattering |
| C. | Sectoring |
| D. | Micro cell zone concept |
| Answer» D. Micro cell zone concept | |
| 49. |
Cell splitting increases the capacity of a cellular system since it increases the number of times ________ are reused. |
| A. | Cells |
| B. | Channels |
| C. | Transmitters |
| D. | Mobile stations |
| Answer» B. Channels | |
| 50. |
Small scale variations of a mobile radio signal are directly related to _______ |
| A. | Impulse response of mobile radio channel |
| B. | Impulse response of base station |
| C. | Frequency response of antenna |
| D. | Frequency response of base station |
| Answer» A. Impulse response of mobile radio channel | |
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