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Engineering Mechanics

Engineering Mechanics
A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.

Equal to
None of these
Less than
Greater than

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Engineering Mechanics
The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

3mr²/5
mr²/3
2mr²/5
2mr²/3

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Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

Twice the area of the triangle
Half the area of the triangle
None of these
Area of the triangle

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Engineering Mechanics
For a self locking machine, the efficiency must be

Equal to 50%
Greater than 50%
Less than 50%
1

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Engineering Mechanics
A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t² (t - 4), the acceleration of the particle will be given by the equation

6f - 4
6t² - 8t
6f - 8
3t² + 2t

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Engineering Mechanics
Center of gravity of a thin hollow cone lies on the axis at a height of

One-third of the total height above base
One-half of the total height above base
Three-eighth of the total height above the base
One-fourth of the total height above base

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