### questions

Title
###### Which model of loss system allows the usage of Poisson distribution model for traffic analysis especially by assuming infinite number of users?

Which model of loss system allows the usage of Poisson distribution model for traffic analysis especially by assuming infinite number of users?

1. lost calls cleared (lcc)
2. lost calls returned (lcr)
3. lost calls held (lch)
4. none of the above
###### Which type of holding time distribution is assumed for the voice conversation on telephone?

Which type of holding time distribution is assumed for the voice conversation on telephone?

1. constant
2. exponential
3. both a and b
4. none of the above
###### If the queuing systems are connected in tandem configuration, what would be the nature of delay?

If the queuing systems are connected in tandem configuration, what would be the nature of delay?

1. commutative
2. distributive
3. cumulative
4. deductive
###### 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?

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?

4. none of the above
###### By which name/s is the Grade of Service (GOS) well-known?

By which name/s is the Grade of Service (GOS) well-known?

1. call congestion
2. time congestion
3. both a and b
4. none of the above
###### How is the relation between Erlang and CCS specified?

How is the relation between Erlang and CCS specified?

1. 1 erlang = 36 ccs
2. 1 erlang = 56 ccs
3. 1 erlang = 76 ccs
4. 1 erlang = 96 ccs
###### The ratio of number of successful calls to the number of call attempts is known as ______

The ratio of number of successful calls to the number of call attempts is known as ______

1. call completion rate (ccr)
2. call block rate (cbr)
3. busy hour call rate (bhcr)
4. none of the above
###### Which assumption prooves call arrivals has Poisson's distribution?

Which assumption prooves call arrivals has Poisson's distribution?

1. pure chance traffic
2. statistical equilibrium
3. full availability
4. calls which faces congestion and gets lost
###### The process in which control signal shares the same path as voice and data is called as __________

The process in which control signal shares the same path as voice and data is called as __________

1. pcm signalling
2. inband signalling
3. outband signalling
4. all of the above
###### Percentage of occupancy can be defined as the percentage of _____ for which the server seems to be busy

Percentage of occupancy can be defined as the percentage of _____ for which the server seems to be busy.

1. volume
2. speed
3. distance
4. time
###### Erlang -B and Erlang-C formulae became foundational results in _________

Erlang -B and Erlang-C formulae became foundational results in _________

1. teletraffic engineering
2. queueing theory
3. both 1 and 2
4. none of the above
###### A message of one signal unit length is called as _________

A message of one signal unit length is called as _________

1. single unit message
2. multi unit message
3. double unit message
4. all of the above
###### ________ group of trunk's system is more efficient

________ group of trunk's system is more efficient.

1. small
2. medium
3. large
4. none of the above
###### The system in which call requests are kept waiting due to unavailability of trunks is known as ____________

The system in which call requests are kept waiting due to unavailability of trunks is known as ____________

1. lost calls system
2. queueing system
3. lost systems in tandem
4. none of the above
###### 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?

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?

1. 21.6 sec
2. 42.2 sec
3. 57.6 sec
4. 98.2 sec
###### Customer line signalling is used for __________

Customer line signalling is used for __________

1. generation of supervision signals and digits
2. conversion of received electrical tone and announcement signals into sound signals
3. conversion of electrical ringing signal into a high level acoustic signal
4. all of the above
###### CCS signalling network is based on __________

CCS signalling network is based on __________

1. geographical location of signalling points
2. number and size of signalling points
3. offered load and services to be provided
4. all of the above
###### 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)

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)

1. 0.025
2. 0.005
3. 0.076
4. 0.056
###### A group of 5 trunks is offering 2 Erlangs of traffic. Find the probability that at least one trunk is free

A group of 5 trunks is offering 2 Erlangs of traffic. Find the probability that at least one trunk is free.

1. 0.037
2. 0.275
3. 0.0917
4. 0.963
###### 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)

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

1. 60e
2. 0.3e
3. 59.7e
4. 55.9e

MCQs

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