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Engineering Mechanics

Engineering Mechanics
The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)

π/ω
ω/2π
2π × ω
2π/ω

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Engineering Mechanics
The ratio of limiting friction and normal reaction is known as

Sliding friction
Angle of friction
Angle of repose
Coefficient of friction

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Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

4r/ 3π
8r/3
3r/4π
3r/ 8

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

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

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Engineering Mechanics
Work done is said to be zero, when

None of these
Some force acts on a body, but displacement is zero
No force acts on a body but some displacement takes place
Either (A) or (B)

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Engineering Mechanics
The bodies which rebound after impact are called

Inelastic bodies
None of these
Neither elastic nor inelastic bodies
Elastic bodies

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