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Engineering Mechanics

Engineering Mechanics
The center of percussion of a solid cylinder of radius ‘r’ resting on a horizontal plane will be

r/2
r/A
3r/2
2r/3

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Engineering Mechanics
If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.

First
Third
None of these
Second

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Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

db³/36
bd³/36
db³/12
bd³/12

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

Both of above are correct
Both of above are wrong
Constant
Equal to the moment of the couple

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Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

P = W tanα
P = W (sinα + μcosα)
P = W (cosα + μsinα)
P = W tan (α + φ)

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Engineering Mechanics
A couple produces

Rotational motion
None of these
Translatory motion
Combined translatory and rotational motion

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