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Engineering Mechanics

Engineering Mechanics
The rate of doing work is known as

None of these
Kinetic energy
Potential energy
Power

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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
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W cos (α + φ)
P = W tan (φ - α)
P = W tan (α + φ)
P = W tan (α - φ)

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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.

Second
Third
First
None of these

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Engineering Mechanics
The forces, which meet at one point and their lines of action also lie on the same plane, are known as

Non-coplanar concurrent forces
Coplanar concurrent forces
Non-coplanar non-concurrent forces
Coplanar non-concurrent forces

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

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

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