Behavioral Telecommunications Interview Questions & Answers:

1. Max number of satellite hops allowed in voice communication is:
a) only one
b) more han one
c) two hops
d) four hops

Max number of satellite hops allowed in voice communication is two hops

2. 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.

Word alignment is aligning the address to the next word boundary of the machine.

3. 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.

Processor serves the interrupt request after completing the execution of the current instruction.

4. 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)

5. 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

Software that allows a personal computer to pretend as a computer terminal is Terminal Emulation

6. 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.

Type of signaling used between two exchanges is inband

7. Frequency at which VOICE is sampled is?
a) 4 KHz
b) 8 KHz
c) 16 KHz
d) 64 KHz

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.

8. What is the maximal decimal number that can be accommodated in a byte?
a) 128
b) 256
c) 255
d) 512

ITS 256.

SINCE, 1 BYTE=8 BITS

THE LOGIC IS 2^8=256(2 TO THE POWER OF 8)

9. The status of the Kernel is?
a) task
b) process
c) not defined.
d) none of the above.

The status of the Kernel is process

10. 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

48 volts. This -48 volts is required by the copper wires to prevent it from corroded & eluded.