C A192004 Pages: 4

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Course Code: BE 100
Course Name: ENGINEERING MECHANICS

Max. Marks: 100 Duration: 3 Hours

PART A (ANSWER ALL QUESTIONS: 8 X 5 = 40 MARKS)

1 Define couple and explain its characteristics. With the help of a sketch, explain (5)
how a force can be resolved into a force and a couple.
2 ௨ State the principle of transmissibility of rigid bodies. (3)

‎A force ٣ =3i-5j +7k acts at A(1,3,4).Determine the moment of force F about the (2)‏ حا
‎origin of coordinate axes.‏

‎3 Explain the principle of Virtual Work. What are the forces that are not (5)
considered in applying the principle of Virtual Work.

‎4 Determine the centroid of the area shown in fig. about the given ೫-೫ &Y-Y (5)
axes.

‎5 A particle moves with simple harmonic motion. When it is at lm and 1.3 mfrom (5)
the centre of the path, its velocities are 3 m/s and 2 m/s respectively. Find the
period of the simple harmonic motion and the acceleration.

‎6 Define instantaneous centre of rotation. A link AB is moving such that it is (5)
inclined at 40° to horizontal at A.The point A is moving horizontally with a
velocity 8 m/sec towards right and point B is moving vertically upward. Locate
the instantaneous centre and find the velocity of the end B of the link.

‎7 A lift has an upward acceleration of 1 171/52. What pressure will a man weighing (5)
600 N exerts on the floor of the lift? What force would he exert if the lift had an
acceleration of 1.0 m/s* downwards?

‎8 A simple pendulum gains 4 seconds per day. By how much the length of the (5)
pendulum be reduced to obtain the correct time.

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