Read the most frequently asked 24 top Telecommunications multiple choice questions and answers PDF for freshers and experienced. Telecommunications objective questions and answers pdf download free..
Telecommunications Multiple Choice Questions and Answers PDF Experienced Freshers
1. How to explain what is ss7?
Common Channel Signaling System No. 7 (i.e., SS7 or C7) is a global standard for telecommunications defined by the International Telecommunication Union (ITU) Telecommunication Standardization Sector (ITU-T). The standard defines the procedures and protocol by which network elements in the public switched telephone network (PSTN) exchange information over a digital signaling network to effect wireless (cellular) and wireline call setup, routing and control.
2. What is a matrix in Telecommunication?
It is a rectangular table of elements, which may be any abstract quantities that can be added an multiplied i.e m*n where m is row and n is columns.
3. What is the best Rx power and Tx power at good RF Conditions?
If u r talking in the sense of Satellite then
it is 6 GHz uplink that is for transmitter and 4 Ghz for downlink frequency that is receiver frequency.
4. Buffering is?
a) the process of temporarily storing the data to allow for small variation in device speeds
b) a method to reduce cross talks
c) storage of data within transmitting medium until the receiver is ready to receive.
d) a method to reduce routing overhead.
storage of data within transmitting medium until the receiver is ready to receive.
in my opinion the following procedure buffering follws so ans is c not a.
The following procedure follows:-
1 An alarm is written into the buffer.
2The alarm is read from the buffer, sent, and re-sent until it successfully reaches the destination(receiver).
3 The alarm is removed from the buffer.
5. When a C function call is made, the order in which parameters passed to the function are pushed into the stack is?
a) left to right
b) right to left
c) bigger variables are moved first than the smaller variables.
d) smaller variables are moved first than the bigger ones.
e) none of the above.
Answer: (b)
6. To send a data packet using datagram , connection will be established?
a) before data transmission.
b) connection is not established before data transmission.
c) no connection is required.
d) none of the above.
Answer: (c)
7. A 2MB PCM(pulse code modulation) has?
a) 32 channels
b) 30 voice channels & 1 signaling channel.
c) 31 voice channels & 1 signaling channel.
d) 32 channels out of which 30 voice channels, 1 signaling channel, & 1 synchronization channel.
Answer: D.
A 2Mb PCM line has 32 channels out of which 30 voice channels, 1 signaling channel, & 1 synchronization channel(time slot 0).
8. Memory allocation of variables declared in a program is?
a) allocated in RAM.
b) allocated in ROM.
c) allocated on stack.
d) assigned to registers.
Answer: a)
stack memory is used at the time of dynamic memory allocation
ex:- malloc();
9. What is TCSM ?
TRANSCODER SUBMULTIPLEXER
10. Time taken for 1 satellite hop in voice communication is?
a) 1/2 second
b) 1 seconds
c) 4 seconds
d) 2 seconds
Answer: a
11. Line of sight is?
a) Straight Line
b) Parabolic
c) Tx & Rx should be visible to each other
d) none of the above
The line of sight is the distance or the path up to which the the TX and the RX is visible to each other because for the proper transmission there should be a ink or connectivity b/w the TX and the RX e.g. at the RF transmission the microwave links are required for the connectivity and data transmission.
12. What is the need of CPG message in ISUP protocol?
Consider any call forwarding scenario.As soon as switch receives Setup, it checks that the Called_Party has forwarded option activated and so tries to forward the call. Meanwhile, Switch sends CPG message towards originator saying that Call is in Progress.
13. Purpose of PC(Program Counter) in a Microprocessor is?
a) To store address of TOS(Top Of Stack)
b) To store address of next instruction to be executed.
c) count the number of instructions.
d) to store base address of the stack.
Answer: b
14. Conditional results after execution of an instruction in a micro processor is stored in?
a) register
b) accumulator
c) flag register
d) flag register part of PSW(Program Status Word)
Answer: d
15. What is the nominal voltage required in subscriber loop connected to local exchange
a) +48 volts
b) -48 volts
c) 230 volts
d) 110 volts
Answer: b
This -48 volts is required by the copper wires to prevent it from corroded & eluded.
16. The status of the Kernel is?
a) task
b) process
c) not defined.
d) none of the above.
Answer: b
The status of the Kernel is process
17. What is the maximal decimal number that can be accommodated in a byte?
a) 128
b) 256
c) 255
d) 512
Answer: b.
SINCE, 1 BYTE=8 BITS
THE LOGIC IS 2^8=256(2 TO THE POWER OF 8)
18. Frequency at which VOICE is sampled is?
a) 4 KHz
b) 8 KHz
c) 16 KHz
d) 64 KHz
Answer: a
The voice signals have a bandwidth of 4Khz (300hz-3400hz signal bandwidth + 450*2hz guard bands= 4000hz) according to Nyquist criteria, the sampling rate must be at least double of this total bandwidth. thus sampling rate= 2*4Khz = 8Khz. this is the required sampling rate to avoid loss of voice signals in transmission.
19. What is the type of signaling used between two exchanges?
a) inband
b) common channel signaling
c) any of the above
d) none of the above.
Answer: a
Type of signaling used between two exchanges is inband
20. A software that allows a personal computer to pretend as a computer terminal is ?
a) terminal adapter
b) bulletin board
c) modem
d) terminal emulation
Answer: d
Software that allows a personal computer to pretend as a computer terminal is Terminal Emulation
21. How many T1 facilities the company needs between its office and the PSTN if it has 47 digital telephones, each operating at 64kbps
3 low-speed video machines, each operating at 384kbps
1 interactive video system, requiring 1.536 mbps.
Need 4 T1's.
Each T1 can accomodate 28 channels.
? 47 digital channels
? 3 low speed V.machines at 384 kbps.
=384/64=6channels
? 1 interactive video systemat 1.536mbps.
=153664=24 channels.
So total=47+6+24=89 channels
each T1 requires 1 synchronizing channel & 1 signalling channel.
So 4 T1 requires 8 channels.
Total=89+8=97 channels.
4T1's =112 channels-96 channels=15 channels(remains free)
22. What action is taken when the processor under execution is interrupted by a non-maskable interrupt?
a) Processor serves the interrupt request after completing the execution of the current instruction.
b) Processor serves the interrupt request after completing the current task.
c) Processor serves the interrupt request immediately.
d) Processor serving the interrupt request depends upon the priority of the current task under execution.
Answer: a
23. Word alignment is?
a) aligning the address to the next word boundary of the machine.
b) aligning to an even boundary.
c) aligning to a word boundary.
d) none of the above.
Answer: a
Word alignment is aligning the address to the next word boundary of the machine.
24. Max number of satellite hops allowed in voice communication is:
a) only one
b) more han one
c) two hops
d) four hops
Answer: c
Max number of satellite hops allowed in voice communication is two hops
Telecommunications Multiple Choice Questions and Answers PDF Experienced Freshers
1. How to explain what is ss7?
Common Channel Signaling System No. 7 (i.e., SS7 or C7) is a global standard for telecommunications defined by the International Telecommunication Union (ITU) Telecommunication Standardization Sector (ITU-T). The standard defines the procedures and protocol by which network elements in the public switched telephone network (PSTN) exchange information over a digital signaling network to effect wireless (cellular) and wireline call setup, routing and control.
2. What is a matrix in Telecommunication?
It is a rectangular table of elements, which may be any abstract quantities that can be added an multiplied i.e m*n where m is row and n is columns.
3. What is the best Rx power and Tx power at good RF Conditions?
If u r talking in the sense of Satellite then
it is 6 GHz uplink that is for transmitter and 4 Ghz for downlink frequency that is receiver frequency.
4. Buffering is?
a) the process of temporarily storing the data to allow for small variation in device speeds
b) a method to reduce cross talks
c) storage of data within transmitting medium until the receiver is ready to receive.
d) a method to reduce routing overhead.
storage of data within transmitting medium until the receiver is ready to receive.
in my opinion the following procedure buffering follws so ans is c not a.
The following procedure follows:-
1 An alarm is written into the buffer.
2The alarm is read from the buffer, sent, and re-sent until it successfully reaches the destination(receiver).
3 The alarm is removed from the buffer.
5. When a C function call is made, the order in which parameters passed to the function are pushed into the stack is?
a) left to right
b) right to left
c) bigger variables are moved first than the smaller variables.
d) smaller variables are moved first than the bigger ones.
e) none of the above.
Answer: (b)
6. To send a data packet using datagram , connection will be established?
a) before data transmission.
b) connection is not established before data transmission.
c) no connection is required.
d) none of the above.
Answer: (c)
7. A 2MB PCM(pulse code modulation) has?
a) 32 channels
b) 30 voice channels & 1 signaling channel.
c) 31 voice channels & 1 signaling channel.
d) 32 channels out of which 30 voice channels, 1 signaling channel, & 1 synchronization channel.
Answer: D.
A 2Mb PCM line has 32 channels out of which 30 voice channels, 1 signaling channel, & 1 synchronization channel(time slot 0).
8. Memory allocation of variables declared in a program is?
a) allocated in RAM.
b) allocated in ROM.
c) allocated on stack.
d) assigned to registers.
Answer: a)
stack memory is used at the time of dynamic memory allocation
ex:- malloc();
9. What is TCSM ?
TRANSCODER SUBMULTIPLEXER
10. Time taken for 1 satellite hop in voice communication is?
a) 1/2 second
b) 1 seconds
c) 4 seconds
d) 2 seconds
Answer: a
11. Line of sight is?
a) Straight Line
b) Parabolic
c) Tx & Rx should be visible to each other
d) none of the above
The line of sight is the distance or the path up to which the the TX and the RX is visible to each other because for the proper transmission there should be a ink or connectivity b/w the TX and the RX e.g. at the RF transmission the microwave links are required for the connectivity and data transmission.
12. What is the need of CPG message in ISUP protocol?
Consider any call forwarding scenario.As soon as switch receives Setup, it checks that the Called_Party has forwarded option activated and so tries to forward the call. Meanwhile, Switch sends CPG message towards originator saying that Call is in Progress.
13. Purpose of PC(Program Counter) in a Microprocessor is?
a) To store address of TOS(Top Of Stack)
b) To store address of next instruction to be executed.
c) count the number of instructions.
d) to store base address of the stack.
Answer: b
14. Conditional results after execution of an instruction in a micro processor is stored in?
a) register
b) accumulator
c) flag register
d) flag register part of PSW(Program Status Word)
Answer: d
15. What is the nominal voltage required in subscriber loop connected to local exchange
a) +48 volts
b) -48 volts
c) 230 volts
d) 110 volts
Answer: b
This -48 volts is required by the copper wires to prevent it from corroded & eluded.
16. The status of the Kernel is?
a) task
b) process
c) not defined.
d) none of the above.
Answer: b
The status of the Kernel is process
17. What is the maximal decimal number that can be accommodated in a byte?
a) 128
b) 256
c) 255
d) 512
Answer: b.
SINCE, 1 BYTE=8 BITS
THE LOGIC IS 2^8=256(2 TO THE POWER OF 8)
18. Frequency at which VOICE is sampled is?
a) 4 KHz
b) 8 KHz
c) 16 KHz
d) 64 KHz
Answer: a
The voice signals have a bandwidth of 4Khz (300hz-3400hz signal bandwidth + 450*2hz guard bands= 4000hz) according to Nyquist criteria, the sampling rate must be at least double of this total bandwidth. thus sampling rate= 2*4Khz = 8Khz. this is the required sampling rate to avoid loss of voice signals in transmission.
19. What is the type of signaling used between two exchanges?
a) inband
b) common channel signaling
c) any of the above
d) none of the above.
Answer: a
Type of signaling used between two exchanges is inband
20. A software that allows a personal computer to pretend as a computer terminal is ?
a) terminal adapter
b) bulletin board
c) modem
d) terminal emulation
Answer: d
Software that allows a personal computer to pretend as a computer terminal is Terminal Emulation
21. How many T1 facilities the company needs between its office and the PSTN if it has 47 digital telephones, each operating at 64kbps
3 low-speed video machines, each operating at 384kbps
1 interactive video system, requiring 1.536 mbps.
Need 4 T1's.
Each T1 can accomodate 28 channels.
? 47 digital channels
? 3 low speed V.machines at 384 kbps.
=384/64=6channels
? 1 interactive video systemat 1.536mbps.
=153664=24 channels.
So total=47+6+24=89 channels
each T1 requires 1 synchronizing channel & 1 signalling channel.
So 4 T1 requires 8 channels.
Total=89+8=97 channels.
4T1's =112 channels-96 channels=15 channels(remains free)
22. What action is taken when the processor under execution is interrupted by a non-maskable interrupt?
a) Processor serves the interrupt request after completing the execution of the current instruction.
b) Processor serves the interrupt request after completing the current task.
c) Processor serves the interrupt request immediately.
d) Processor serving the interrupt request depends upon the priority of the current task under execution.
Answer: a
23. Word alignment is?
a) aligning the address to the next word boundary of the machine.
b) aligning to an even boundary.
c) aligning to a word boundary.
d) none of the above.
Answer: a
Word alignment is aligning the address to the next word boundary of the machine.
24. Max number of satellite hops allowed in voice communication is:
a) only one
b) more han one
c) two hops
d) four hops
Answer: c
Max number of satellite hops allowed in voice communication is two hops
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