www.scr.indianrailways.gov.in Model Question Paper : South Central Railway

[muthukalee]

South Central Railway
QUESTION BANK FOR SE/Tele EXAMINATION

1) What is the advantage of DTL MUX over conventional ITI MUX?
2) According to the CCITT recommendations, how the basic group is constructed? Explain with diagram?
3) In DTL MUX, what are the steps involved to translate a low frequency voice channel to high frequency of band 60 to 552 KHz ?
4) Write short notes on any two of the following:
a) Channel modem b) VFT card c) Base band combiner Board.
5) What are the basic requirements of PCM system? Explain about sampling?

http://www.scr.indianrailways.gov.in...66-SE-Tele.pdf

What is a frame and multi-frame? Explain about multi-frame?
6) List out the factors to be considered for selecting a site for a microwave station.
7) What do you understand by the terms – non-fade level, fade margin and threshold level. Briefly explain each of them.
8) What are the merits and de-merits of frequency diversity system over space diversity system?
9) Explain working of SPC exchange with a functional block diagram
10) Draw the basic block diagram of an ELECTRONIC TELEPHONE and explain its working.
11) List out the features of any electronic exchange and explain any five features
12) What are the different types of modulation techniques and explain balance modulator?
13) Expalin about positive and negative feed back? Explain advantages of negative feedback in amplifiers
14) Write short notes on any Three
i) Phase lock loop ii) Automatic gain control (AGC) iii) Varactor Diode iv) Step Recovery diode v) Mixer in Receiver
15) What do you understand by hybrid circuit? Describe the audio range bybrid function in full detail with diaram
16) What are the precautions to be taken while loading the RE main telecom cable drums? How cable is laid on culverts and bridges?
17) What are the different types of RE cable joints? Explain the function of loading coil joint and condenser joint?
18) What are the periodical tests to be carried out on underground cables and give the accepted value?
19) Write the quad allocation for 6-quad cable and give its electrical characteristics?
20) What are the periodical tests to be conducted on RE cable circuits and explain the procedure for each? Write about emergency control in RE area

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