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Engineering Mechanics

Engineering Mechanics
Moment of inertia of a circular section about its diameter (d) is

πd4/64
πd3/16
πd3/32
πd4/32

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

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Engineering Mechanics
The maximum efficiency of a lifting machine is

1/(m × V.R.)
V.R./m
1/m
m/V.R.

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Engineering Mechanics
The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

7mr²/3
2mr²/3
2mr²/5
7mr²/5

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Engineering Mechanics
The force, by which the body is attracted, towards the center of the earth, is called

Weight
Mass
Impulsive force
Momentum

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Zero at its upper end
Perpendicular to the wall at its upper end
Downwards at its upper end

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