Top 150+ Solved Mobile Communication MCQ Questions Answer
Q. 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
Q. 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
Q. 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
Q. 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
Q. 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
Q. 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
Q. 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
Q. Major classes of signalling are ___________
a. customer line signalling
b. in channel signalling
c. common channel signalling
d. both 2 and 3
Q. 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
Q. 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
Q. 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