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Mechanical Engineering Objective Questions { Engineering Mechanics }



36. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than
A.Two members with unknown forces of the frame
B.Three members with unknown forces of the frame
C.Four members with unknown forces of the frame
D.Three members with known forces of the frame

37. Two coplaner couples having equal and opposite moments
A.Balance each other
B.Can not balance each other
C.Are equivalent
D.Produce a moment of couple

38. The centre of gravity of a uniform lamina lies at
A.The centre of heavy portion
B.The bottom surface
C.The mid point of its axis
D.All of the above

39. Centre of gravity of a solid cone lies on the axis at the height
A.One-fourth of the total height above base
B.One-third of the total height above base
C.One-half of the total height above base
D.Three-eighth of the total height above the base

40. Centre of percussion is
A.The point of C.G.
B.The point of metacentre
C.The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
D.Point of suspension

41. Centre of gravity of a thin hollow cone lies on the axis at a height of
A.One-fourth of the total height above base
B.One-third of the total height above base
C.One-half of the total height above base
D.Three-eighth of the total height above the base

42. The centre of percussion of the homogeneous rod of length L suspended at the top will be
A.L/2
B.L/3
C.3L/4
D.2L/3

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