Jawaharlal Nehru Technological University Hyderabad 2007 B.E Civil Engineering SOIL DYNAMICS AND MACHINE FOUNDATION-setno3 - Question Paper

1. (a) What is the data needed for carrying out design of machine foundations. [8]
(b) elaborate the various kinds of machine foundations . discuss their suitability
to different kinds of machines. [8]
2. Starting from fundamentals, find the equations of motion for over damped, crit-
ically damped and under damped systems. [16]
3. (a) explain Tschebotarioff?s decreased natural frequency. [8]
(b) define the factors affecting co-efficient of elastic uniform compression. [8]
4. (a) Why is vibration isolation needed [8]
(b) What do you understand by active isolation and passive isolation. [8]
5. elaborate the laboratory methods used to determine the dynamic properties of
soils? discuss them in brief. [16]
6. (a) Write a note on pressure bulb concept [8]
(b) How do you arrive at the stiffness factor. [8]
7. (a) elaborate the changes made by Quinlan and Sung to Reissner?s theory?
Explain. [10]
(b) discuss Hsiegn’s formula for vertical vibrations. [6]
8. (a) discuss the resonance and its effect. [8]
(b) explain the criteria for design of impact kind of machines, [8]
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