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Engineering Mechanics

Engineering Mechanics
The ratio of static friction to dynamic friction is always

Less than one
Greater than one
None of these
Equal to one

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Engineering Mechanics
The unit of moment of inertia of an area is

kg/m2
m4
kg-m-s2
kg-m2

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

None of these
tan(α - φ)/tanα
tanα/tan (α + φ)
tan(α + φ)/tanα

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Engineering Mechanics
If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that

tanθ = √(ΣV + ΣH)
tanθ = ΣV/ΣH
tanθ = ΣV × ΣH
tanθ = ΣH/ΣV

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Engineering Mechanics
The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is

16 cm4
9 cm4
12 cm4
20 cm4

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Engineering Mechanics
In order to determine the effects of a force, acting on a body, we must know

Magnitude of the force
Nature of the force i.e. whether the force is push or pull
Line of action of the force
All of these

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