Engineering Mechanics MCQ with Answers

Engineering Mechanics MCQ with Answers

66) A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-circular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Answer is:

slant down towards direction of pull

67) A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of

Answer is:

0.134 r

68) The algebraic sum of moments of the forces forming couple about any point in their plane is

Answer is:

equal to the moment of the couple

69) A single force and a couple acting in the same plane upon a rigid body

Answer is:

cannot balance each other

70) If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

Answer is:

all the above are correct

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