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Engineering Mechanics

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

2π/ω
ω/2π
2π × ω
π/ω

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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 unit of work in S.I. units is

Newton
erg
joule
kg-m

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Engineering Mechanics
The centre of percussion is below the centre of gravity of the body and is at a distance equal to

h2/kG
h × kG
kG2/h
h/kG

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

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

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Engineering Mechanics
The maximum acceleration of a particle moving with simple harmonic motion is

ω
ω²r
ωr
ω/r

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