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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018
Course Code: BE 100
Course Name: ENGINEERING MECHANICS

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions.
1 State and prove Varignon’s theorem of moments. (5)
2 A force acts at the origin in a direction defined by the angles ©» =65°and 62-40". (5)

The > component of the force 15 -90kN. Determine the other components of force
and value ۹× . Also find the magnitude of force.

3 A body weighing 15014 15 at rest on a horizontal plane. If a horizontal force of (5)
108N will just cause it to slide, determine the limiting friction and coefficient of
friction.

4 Define 3) Radius of gyration b) Product of inertia 0) Polar moment of inertia. (5)

5 Explain the concept of instantaneous centre with figure. (5)

6 Differentiate between free vibration and forced vibration of bodies. (5)

7 State D’Alembert’s principle. Write the equations of dynamic equilibrium for the (5)
motion of a lift moving upwards with an acceleration 2 11/52 carrying a weight of
‘W’N.

8 Determine the weight, which is to be connected to a spring of stiffness SN/cm, so (5)

that the weight is oscillating with a time period of 1500.

PART B
SETI
Answer any 2 questions.
9 ஐ Distinguish between a force and a couple. What are the characteristics of a (5)
couple?
b) Determine the support reactions at ‘A’ and ‘B’. (5)
SKN 4138 8128

yd oe De

۲ ۳ 2

¢ 45” நறை
Lom 2m 2m 2m 4

10 A force P is directed from a point A (4,1,4) and a point B (-3,4,-1). If it causes മ (10)

moment Mz = 1900Nm, determine the magnitude of force P and the moment of

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