Explore topic-wise MCQs in Electronics and Telecommunication Engineering [ENT.

This section includes 210 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics and Telecommunication Engineering [ENT knowledge and support exam preparation. Choose a topic below to get started.

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
Answer» C. n (n – 1) / 4
Discussion
2.

2G GSM architecture follows ……. Reference Model

A. OSI Model
B. TCP/IP Model
C. both a and b
D. None of the above
Answer» B. TCP/IP Model
Discussion
3.

DCS 1800 has ……number of duplex channels

A. 354
B. 374
C. 385
D. 395
Answer» C. 385
Discussion
4.

……..services are supported by the GSM

A. Bearer Services
B. Teleservices
C. Supplementary Services
D. All the above
Answer» E.
Discussion
5.

DCS 1800 has the uplink and downlink frequency interval of …..

A. 25MHz
B. 45MHz
C. 95MHz
D. 90MHz
Answer» D. 90MHz
Discussion
6.

GSM Architecture consists of ….. Interface

A. Um
B. Abis
C. A
D. All the above
Answer» E.
Discussion
7.

GSM Architecture consists of …..

A. BTS
B. BSC
C. MSC
D. All the above
Answer» E.
Discussion
8.

A single 2G GSM frame consists of……..time slots

A. 20
B. 8
C. 10
D. 15
Answer» C. 10
Discussion
9.

In GSM-900 system, uplink and downlink carrier frequency differ by ……………

A. 20MHz
B. 45MHz
C. 25MHz
D. 200kHz
Answer» C. 25MHz
Discussion
10.

In GSM-900 system, downlink frequency is ……………

A. 895MHz-920MHz
B. 880MHz-905MHz
C. 885MHz-910MHz
D. 890MHz-915MHz
Answer» E.
Discussion
11.

In GSM-900 system, uplink frequency is ……………

A. 935MHz-960MHz
B. 930MHz-955MHz
C. 940MHz-965MHz
D. 945MHz-970MHz
Answer» B. 930MHz-955MHz
Discussion
12.

In GSM-900 system, total number of radio carriers are……………

A. 120
B. 124
C. 125
D. 200
Answer» C. 125
Discussion
13.

In GSM-900 system, two subbands of ………..are assigned.

A. 200kHz
B. 20kHz
C. 20 MHz
D. 25 MHz
Answer» E.
Discussion
14.

…….stores the subscrier information and part of mobile information from home PLMN.

A. AUC
B. EIR
C. HLR
D. VLR
Answer» D. VLR
Discussion
15.

……recognizes that the MS is from another PLMN when roaming is allowed.

A. AUC
B. EIR
C. HLR
D. VLR
Answer» E.
Discussion
16.

……….. Is the database that allows checking of the user with assigned SIM card.

A. AUC
B. EIR
C. HLR
D. VLR
Answer» B. EIR
Discussion
17.

………………provides MS information used by MSC and maintains a list of legitimate,fraudulent or faulty MSs.

A. AUC
B. EIR
C. HLR
D. VLR
Answer» C. HLR
Discussion
18.

ISDN stands for……

A. Integrated Services Digital Network
B. Integrated System Digital Network
C. Integrated Services Data Network
D. Integrated System Data Network
Answer» B. Integrated System Digital Network
Discussion
19.

PSTN stands for……

A. Public System Telephone Network
B. Public Security Telephone Network
C. Public Switched Telephone Network
D. Public System Telecommunication Network
Answer» D. Public System Telecommunication Network
Discussion
20.

GSM system includes……..frequency bands.

A. 900MHz
B. 1800MHz
C. a and b
D. None of the above
Answer» D. None of the above
Discussion
21.

GSM system is a …………..system.

A. Frequency division
B. Time Division
C. CDMA
D. a and b
Answer» E.
Discussion
22.

FDD stands for ……..

A. Frequency Division Duplex
B. Full Division Duplex
C. Frequency Double Duplex
D. Frequency Duplex Division
Answer» B. Full Division Duplex
Discussion
23.

A duplex transmission is realized in 2G GSM with the help of ……..

A. FDD
B. TDD
C. a and b
D. None of the above
Answer» B. TDD
Discussion
24.

Which of the following is the world’s first cellular system to specify digital modulation and network level architecture?

A. GSM
B. AMPS
C. CDMA
D. IS-54
Answer» B. AMPS
Discussion
25.

Which of the following memory device stores information such as subscriber’s identification number in GSM?

A. Register
B. Flip flop
C. SIM
D. SMS
Answer» D. SMS
Discussion
26.

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» D. none of the above
Discussion
27.

GOS of lost call systems can be calculated using __________

A.
Answer» E.
Discussion
28.

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» B.  lost calls returned (lcr)
Discussion
29.

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» C. both a and b
Discussion
30.

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» B. statistical equilibrium
Discussion
31.

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» B. distributive
Discussion
32.

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» C.  by underload condition
Discussion
33.

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» B. 1 erlang = 56 ccs
Discussion
34.

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» B. call block rate (cbr)
Discussion
35.

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» B. time congestion
Discussion
36.

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» C. outband signalling
Discussion
37.

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» E.
Discussion
38.

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» B. multi unit message
Discussion
39.

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» D. none of the above
Discussion
40.

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» E.
Discussion
41.

________ group of trunk's system is more efficient.

A. small
B. medium
C. large
D. none of the above
Answer» D. none of the above
Discussion
42.

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» C. lost systems in tandem
Discussion
43.

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» E.
Discussion
44.

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» D. 55.9e
Discussion
45.

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» C. 0.076
Discussion
46.

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» E.
Discussion
47.

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» B. 8 calls by single server and 250 calls by a group
Discussion
48.

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» D. 1e and 0.2e respectively
Discussion
49.

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» E.
Discussion
50.

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» C. 4.5
Discussion