01-02-2013, 10:19 AM
III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008
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1. (a) What are obligatory points? How do they affect road alignment? Explain by
giving suitable sketches wherever needed.
(b) Explain briefly the modified classification of road system in India as per the
Third twenty year road development plan, 1981-2001. [8+8]
2. (a) Derive an expression for finding the extra widening required on horizontal
curves.
(b) Calculate the stopping sight distance for a design speed of 100 kmph. Take
the total reaction time as 2.5 seconds and the coefficient of friction = 0.35.
[8+8]
3. (a) Explain how the speed and delay studies are carried out. What are the various
uses of speed and delay studies.
(b) What are the applications of location file, spot maps, collision diagrams and
condition diagrams? [8+8]
4. (a) What are the guide lines for selecting a rotary type of intersection? Explain.
(b) How traffic islands can effectively used at an intersection to bring in more
orderly and safe movement? Explain by giving suitable examples supported
by diagram. [8+8]
5. What are the various factors to be considered in the pavement design? Discuss the
significance of each. [16]
6. (a) What are the different types of sleepers used in the track on Indian Railways?
Write down in brief the advantages and disadvantages of each type.
(b) Illustrate with sketches, the various fastenings used to fasten rails to sleepers.
Discuss the merits and demerits. [8+8]
7. (a) Define Interlocking and explain the principle of interlocking. Describe the
various mechanical devices used for Interlocking.
(b) What do you understand by ?Negative superelevation? When from layout
of a B.G. yard, a 80 curve branches off from a 40 main curve in an opposite
direction. If speed is restricted to 28.95 kmph and permissible value of cant
deficiency is 7.61 cm, determine the speed restriction on the main line. [8+8]