CON 657(A) 4
Instructions.—(1) Answers must be written in English or Hindi. However all
the answers should be in one language only.


Answer any two questions from Section any two questions from Section II and any one question from Section III.


All questions carry equal marks.


Parts of the same questions, if any, must be answered together without answers to other questions intervening.


Figures to the right indicate full marks of the question part of the question.


Each question must be started on fresh page.


Answers will be evaluated on the basis of logic, clarity and criticality in exposition.


Marks will be deducted for illegible handwriting.


Use of non-programmable electronic calculator log table slide rule is permitted.


Assume any additional data, if deemed necessary and state the assumptions clearly.



Marks
SECTION I

1. Write short notes on

(a)Sand drains

(b)Subsurface exploration

(c)Dewatering of deep foundations

(d)Soil nailing.


2.(a)What is grouting Explain various types of grouting.
(b)Explain various types of solution grouts.
(c)What are geotextiles Explain its applications.
(d)What are stone columns Explain their application.


3. Explain with neat sketches
(a)Cellular Cofferdam
(b)Double Sheet Wall Cofferdam
(c)Explain a suitable method of sinking open Caisson.
(d)Breakwater.



SECTION II
4. A normal project consisting of 16 activities is shown in the following table.

<img src='./qimages/1570-4.jpg'>

(Determine Normal Duration of activities from PERT time).

(a)Determine optimum duration, optimum cost.
(b)Determine duration corresponding to chances of 80% completion of the project.
(c)What is the role of a project manager in a construction work?
(d)What is meant by specification What are the types?


5.(a)What is project? Explain Project planning in context with functions, task management, project life cycle elements.
(b)Describe various scheduling techniques.
(c)Explain the concept of Work Breakdown Structure (WBS).
(d)What are safety precautions to be taken on site of work.


6.(a)What is project network? Explain the difference between networking and non-networking techniques.
(b)Explain the difference between PERT and CPM.
(c)What is resource leveling in project planning.
(d)What are the methods for estimating the duration of an activity.



SECTION III

7.(a)Design a circular column with helical reinforcement subjected to a working load of 1500KN. Diameter of the column is 450mm. The column has unsupported length of 3.5m and is effectively held in position at both ends but not restrained against rotation. Use limit state design method. Use M-25 concrete and HYSD Fe-415 steel.
(b)Derive the expression for three moment theorem.
(c)What are the assumptions made in the analysis of beam.


8.(a)A hollow alloy tube 5 metre long with external and internal diameters equal to 40 mm and 25 mm respectively was found to extend by 6.4 mm under a tensile load of 60 KN. Find the buckling load for the tube, when used as column with both ends pinned. Also find the safe compressive load for the tube, with a factor of safety of 4.
(b)Derive the Euler’s formulae for load on a slender m.s column with both ends hinged.
(c)What is a fillet weld? Explain its advantages