Subject Code: 2154004
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018Subject Name: Railway & Bridge Engineering
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- Support your answer with neat sketches wherever possible.
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Q.1 (a) Discuss the role of railway transportation in development of a nation. [05]
(b) Draw a typical cross section of a permanent way. Write down the basic functions of various components of the railway track. [06]
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(c) Briefly explain: Grade compensation, Kink, Capacity of track. [03]
Q.2 (a) Discuss: why the uniformity of gauges in railway is necessary? [03]
(b) What are the basic requirements of good railway track alignment? Briefly discuss factors which control the alignment of a railway track. [04]
(c) Discuss: (i) Cant deficiency, (ii) Negative super elevation - for the railway track. [07]
OR
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(c) Write short note on: (i) Tractive resistance, (ii) Coning of wheel. [07]
Q.3 (a) Discuss the factors on which sleeper density depends and how the sleeper density is expressed. [03]
(b) Draw detailed elevation and sectional side view of typical R. C. C. girder bridge with well foundation and show all the components. [05]
(c) Calculate the maximum permissible speed on a curve of high speed BG track having 2° curve; 8 cm super elevation and 160m long transition curve. [06]
OR
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Q.3 (a) Draw the neat diagram of simple right hand turnout. Show its various parts. [04]
(b) Briefly describe: (i) Automatic Block System, (ii) Centralized Traffic Control (CTC) System. [04]
(c) From a layout of B.G. yard, 8° curve branches off from a 4° main curve in an opposite direction. If speed is restricted to 30 kmph on branch line, determine the speed restriction on the main line. [06]
Q.4 (a) Briefly explain following terms and write their formulae for the computation: Afflux, Design scour depth. [04]
(b) What are the functions of bridge foundations? What are the factors affecting for selection of types of bridge foundation? [04]
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(c) Compute the design discharge and linear water way for the river bridge site from the following data: River cross sectional area = 900 sq.m, Wetted perimeter = 300 m, River bed slope = 1: 2000, Coefficient of roughness = 0.03, Lacey’s constant = 4.8. [06]
Date: 04/12/2018
Total Marks: 70
Q.4 (a) What are the functions of bridge bearings? What are the requirements of ideal bridge bearings? [04]
(b) Draw neat sketches: Deep base bearing, Rocker bearing, Sliding plate bearing, Roller bearing. [04]
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(c) Determine the number of spans and each span length of a river bridge from the following data: Design discharge = 1400 m³/s, Silt factor = 0.6, Afflux = 1m, Free board = 1.2m, Width of stream at HFL = 200m. [06]
Q.5 (a) What are the objects of river training works? Explain with sketches various types of river training works used for the bridges. [05]
(b) Discuss with sketches IRC Class 70R loading for Tracked vehicle and Wheeled vehicle. [05]
(c) Describe the importance of health monitoring of bridges. [04]
OR
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Q.5 (a) Briefly describe with sketches ‘Erection of Suspension Bridge’. [05]
(b) Explain with sketches NDT tests for bridges. [05]
(c) Discuss various repair and retrofitting measures can be adopted for R. C. C. highway bridge. [04]
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