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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a square of side (a) about an axis through its center of gravity is

a4/12
a4/8
a4/36
a4/4

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Engineering Mechanics
The acceleration of a body sliding down an inclined surface is

g cosθ
g sinθ
None of these
g tanθ

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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
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

Ideal
Non-reversible
None of these
Reversible

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Engineering Mechanics
A redundant frame is also called __________ frame.

Perfect
None of these
Deficient
Imperfect

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

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