8 C2103

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST/SECOND SEMESTER B.TECH DEGREE EXAMINATION, JULY 2018

Course Code: BE100
Course Name: ENGINEERING MECHANICS

Max. Marks: 100 ⋮ Duration: 3 Hours
PARTA |
Answer all questions, each carries 5 marks Marks
1 Differentiate between the various types of supports for beams. (5)
2 Explain Free Body Diagram with sketches. (5)
3 What are the characteristics of dry friction? (5)
4 Differentiate between ‘polar moment of inertia’ and ‘product of inertia’. (5)
5 ^ Define the term instantaneous centre in plane motion and explain the methods to (5)
locate it.
Differentiate between periodic motion and simple harmonic motion. (5)
7 A body of mass ‘m’ is undergoing rectilinear motion under a force of (5)

F = F,Sinat , establish the equations for:

i) Displacement —time relationship ii) Velocity-time relationship
iii) Acceleration-time relationship.
The initial displacement and velocity are zero.
8 State the difference between free and forced vibration. Derive the differential (൭)
equation for free vibration system considering only spring mass model.
PART B
Answer any 2 full questions from each set, each carries 10 marks
SETI
9 Three spheres A, B and C weighing 300N, 600N and 300N respectively and (10)
having diameters 800mm, 1200mm and 800mm respectively are placed in a
trench as shown in Fig.1. Determine the reactions developed at contact points P,
Q, Rand S. The angle of inclination is 30°.

/

Fig.1

10 Determine the resultant of the three forces acting on the dam section shown in (10)
Fig.2and locate its intersection with the base AB. For a safe design this
intersection should be within the middle third. Is it a safe design?

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