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Theory of Machine

Theory of Machine
A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

2ωv²
ωv
ω²v
2ωv

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Theory of Machine
The magnitude of linear velocity of a point B on a link AB relative to point A is, (Where ω = Angular velocity of the link AB)

(ω × AB)²
ω × (AB)²
ω × AB
ω² × AB

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Theory of Machine
Which of the following is a lower pair?

Piston and cylinder
Cam and follower
Both (A) and (B) above
Ball and socket i

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Theory of Machine
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Longitudinal vibrations
All of these
Torsional vibrations
Transverse vibrations

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Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Reduce slip
Reduce vibration
Ensure proper alignment
Ensure uniform loading

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Theory of Machine
In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

x₁/x₂
log(x₁/x₂)
log(x₁.x₂)
loge(x₁/x₂)

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